java实现科学计算器的全过程与代码
作者：浪漫的硝烟 时间：2022-04-09 07:49:52
介绍
本次设计的是一个有33个按钮的科学计算器。可以进行加，减，乘，除，开根号，阶乘，次方，百分号，对数，三角函数的计算。
实现思路
通过点击按钮可以得到一个算术表达式，并且它是一个字符串类型，然后需要做的就是把这个字符串转化为计算机可计算的形式。这里就需要用到中缀表达式转化为后缀表达式。转化完之后通过栈来一步步的进行输出和计算，最后输出结果。
实现过程和代码
1.界面设计
设计效果如图所示：
由图片可知，总共设计了两个文本框和33个按钮（这里的布局是我直接用setBounds()方法设计的。因为如果用布局管理器的话要达到自己想要的效果不太方便）。
在设计时要注意的是：
1.不能把按钮和文本框直接加入JFrame中，因为如果JFrame.setLayout(null)的话，面板上就会出问题，什么都看不到或者其他情况。因此建议创建一个JPanel，把JPanel的setLayout()设置为空。把按钮和文本框加入到JPanel中，再把JPanel加入到JFrame中。就不会出问题了。JFrame的布局管理器默认为流式布局，位置是中心区域。
2.设计完长度后，宽度一般要再加15个像素点，高度要再加35个像素点.要不然会有一部分按钮看不到。如我本意要设计的面板宽为600，高为400，则实际上是
jFrame.setSize(614, 437);
下面就是我设计的界面的代码：
private JFrame jFrame = new JFrame("计算器");
//设置字体，是否加粗，大小
private FontUIResource f = new FontUIResource("隶书", 1, 20);
private FontUIResource f1 = new FontUIResource("楷书", 0, 35);
private JPanel jPanel = new JPanel();
private int buttonx = 100;
private int buttony = 50;
private int yy = 50;
//两个文本框
private JTextField jTextField1 = new JTextField("0", 30);
private JTextField jTextField2 = new JTextField("输入要求在main()中", 30);
private String str = "";
private String temp = "";
private int indexYN = 0;
private String[] strings = {
"(", ")", "1/x", "x^2", "x^3", "x^y",
"x!", "√", "e", "ln", "log", "％",
"sin", "cos", "tan", "π", "+", "=",
"7", "8", "9", "0", "-",
"4", "5", "6", ".", "*",
"1", "2", "3", "c", "÷"
};
//33个按钮
private JButton[] buttons = new JButton[33];
public void loAsi(){
int tep = 0;
for (int i = 0; i < 3; i++) {
for (int j = 0; j < 6; j++) {
buttons[tep] = new JButton(strings[tep]);
buttons[tep].setFont(f);
buttons[tep++].setFocusable(false);
}
}
for (int i = 0; i < 3; i++) {
for (int j = 0; j < 5; j++) {
buttons[tep] = new JButton(strings[tep]);
buttons[tep].setFont(f);
buttons[tep++].setFocusable(false);
}
}
int lo = 0;
for (int i = 0; i < 2; i++) {
for (int j = 0; j < 6; j++) {
buttons[lo++].setBounds(buttonx * j, yy * (2 + i), buttonx, buttony);
}
}
for (int i = 0; i < 5; i++) {
buttons[lo++].setBounds(buttonx * i, yy * 4, buttonx, buttony);
}
buttons[lo++].setBounds(buttonx * 5, yy * 4, buttonx, buttony * 4);
for (int i = 0; i < 3; i++) {
for (int j = 0; j < 5; j++) {
buttons[lo++].setBounds(buttonx * j, yy * (5 + i), buttonx, buttony);
}
}
jTextField1.setBounds(0, yy, 600, yy);//设置位置
jTextField1.setFont(f1);设置字体
jTextField1.setHorizontalAlignment(JLabel.RIGHT);//文本靠右
jTextField1.setEditable(false);//不可修改
jTextField1.setBackground(Color.WHITE);//颜色为白色
jTextField2.setBounds(0, 0, 600, yy);
jTextField2.setFont(f1);
jTextField2.setHorizontalAlignment(JLabel.RIGHT);
jTextField2.setEditable(false);
jTextField2.setBackground(Color.WHITE);
}
public void initButton(){//把按钮添加到jPanel中
this.loAsi();
jPanel.add(jTextField1);
jPanel.add(jTextField2);
for (int i = 0; i < buttons.length; i++) {
jPanel.add(buttons[i]);
}
jPanel.setLayout(null);//布局管理器为空，自定义设计
}
public void init(){
this.initButton();
this.buttonLister();
jFrame.add(jPanel);//把jPanel添加到jFrame中
jFrame.setSize(614, 437);//jFrame的长宽
jFrame.setResizable(false);//大小不可修改
jFrame.setLocationRelativeTo(null);//位置为显示器的正中间
//窗口 * ，点右上角的关闭就关闭窗口
//可以不写，应为JFrame默认的就可以关闭，不需要写事件 * 。如果是Frame的话需要写。
jFrame.addWindowListener(new WindowAdapter() {
@Override
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
jFrame.setVisible(true);//设置面板可见
}
2.栈，中缀转后缀
我总共设计了12种运算符：（+, -, * , /, ^, !, g, l, o, s, c, t）分别是加，减，乘，除，次方，阶乘，开根号，，对数ln, 对数log2, sin, cos, tan
e是Math.E, p是Math.PI, ％是直接乘以0.001
把中缀表达式转换为后缀表达式。例如：
中缀表达式：1+2*3+(l2+3)/2
后缀表达式为：123*+23+2/+
后缀表达式的运算步骤是：
1.16+23+2/+
2.723+2/+
3.752/+
4.7 2.5+
5.9.5
代码如下：
private List<String> zhongZhui(String str) {//把输入的字符串转换成中缀表达式。存入list中
int index = 0;
List<String> list = new ArrayList<>();
do{
char ch = str.charAt(index);
if("+-*/^!logsct()".indexOf(str.charAt(index)) >= 0){
//是操作符，直接添加至list中
index ++;
list.add(ch+"");
}else if (str.charAt(index) == 'e' || str.charAt(index) == 'p'){
index ++;
list.add(ch+"");
} else if("0123456789".indexOf(str.charAt(index)) >= 0){
//是数字,判断多位数的情况
String str1 = "";
while (index < str.length() && "0123456789.".indexOf(str.charAt(index)) >= 0){
str1 += str.charAt(index);
index ++;
}
list.add(str1);
}
}while (index < str.length());
return list;
}
public List<String> houZhui(List<String> list){//中缀表达式转换称后缀表达式
Stack<String> fuZhan = new Stack<>();
List<String> list2 = new ArrayList<>();
if (!list.isEmpty()) {
for (int i = 0; i < list.size(); i++) {
if (isNumber(list.get(i))){
list2.add(list.get(i));
} else if (list.get(i).charAt(0) == '('){
fuZhan.push(list.get(i));
} else if (isOperator(list.get(i)) && list.get(i).charAt(0) != '('){
if (fuZhan.isEmpty()){
fuZhan.push(list.get(i));
} else {//符栈不为空
if (list.get(i).charAt(0) != ')'){
if (adv(fuZhan.peek()) <= adv(list.get(i))){
//入栈
fuZhan.push(list.get(i));
} else {//出栈
while (!fuZhan.isEmpty() && !"(".equals(fuZhan.peek())){
if(adv(list.get(i)) <= adv(fuZhan.peek())){
list2.add(fuZhan.pop());
}
}
if (fuZhan.isEmpty() || fuZhan.peek().charAt(0) == '('){
fuZhan.push(list.get(i));
}
}
} else if (list.get(i).charAt(0) == ')'){
while (fuZhan.peek().charAt(0) != '('){
list2.add(fuZhan.pop());
}
fuZhan.pop();
}
}
}
}
while (!fuZhan.isEmpty()){
list2.add(fuZhan.pop());
}
} else {
jTextField1.setText("");
}
return list2;
}
public static boolean isOperator(String op){//判断是否为操作符
if ("0123456789.ep".indexOf(op.charAt(0)) == -1) {
return true;
} else {
return false;
}
}
public static boolean isNumber(String num){//判断是否为操作数
if ("0123456789ep".indexOf(num.charAt(0)) >= 0) {
return true;
} else {
return false;
}
}
public static int adv(String f){//判断操作符的优先级
int result = 0;
switch(f) {
case "+":
result = 1;
break;
case "-":
result = 1;
break;
case "*":
result = 2;
break;
case "/":
result = 2;
break;
case "^":
result = 3;
break;
case "!":
result = 4;
break;
case "g":
result = 4;
break;
case "l":
result = 4;
break;
case "o":
result = 4;
break;
case "s":
result = 4;
break;
case "c":
result = 4;
break;
case "t":
result = 4;
break;
}
return result;
}
3.判断错误
下面是一些我能想到的一些输入错误和运算错误：
//当只有一位字符时，只能是“0123456789ep”中的一个
//1.第一个字符只能为"losctg(0123456789ep"中的一个
//2.“±/”后面只能是"0123456789losctg(ep"中的一个
//3.".“后面只能是“0123456789”中的一个
//4.”!"后面只能是“±/^)”中的一个
//5."losctg"后面只能是“0123456789(ep”中的一个
//6."0"的判断操作
//1.当0的上一个字符不为"0123456789."时，后一位只能是“±/.!^)”中的一个
//2.如果0的上一位为“.”,则后一位只能是“0123456789±/.^)”中的一个
//3.如果0到上一个运算符之间没有“.”的话，整数位第一个只能是“123456789”，
// 且后一位只能是“0123456789±/.!^)”中的一个。
//4.如果0到上一个运算符之间有一个“.”的话,则后一位只能是“0123456789±/.^)”中的一个
//7."123456789"后面只能是“0123456789±/.!^)”中的一个
//8."(“后面只能是“0123456789locstg()ep”中的一个
//9.”)"后面只能是“±/!^)”中的一个
//10.最后一位字符只能是“0123456789!)ep”中的一个
//12.不能有多个“.”
//13."ep"后面只能是“±*/^)”中的一个
除数不能为0
阶乘必须为自然数
ln的x必须大于0
log的x必须大于0
tan的x不能为±(π/2 + kπ)
括号是否匹配
代码如下：
public void estimate(){//判断输入是否错误
int i = 0;
if (str.length() == 0){
}
if (str.length() == 1){
//当只有一位字符时，只能是“0123456789ep”中的一个
if ("0123456789ep".indexOf(str.charAt(0)) == -1){
jTextField1.setText("输入错误！");
indexYN = 1;
}
}
if (str.length() > 1){
for (i = 0; i < str.length() - 1; i++) {
//1.第一个字符只能为"losctg(0123456789ep"中的一个
if ("losctg(0123456789ep".indexOf(str.charAt(0)) == -1){
jTextField1.setText("输入错误！");
indexYN = 1;
}
//2.“+-*/”后面只能是"0123456789losctg(ep"中的一个
if ("+-*/".indexOf(str.charAt(i)) >= 0 && "0123456789losctg(ep".indexOf(str.charAt(i + 1)) == -1){
jTextField1.setText("输入错误！");
indexYN = 1;
}
//3."."后面只能是“0123456789”中的一个
if (str.charAt(i) == '.' && "0123456789".indexOf(str.charAt(i + 1)) == -1){
jTextField1.setText("输入错误！");
indexYN = 1;
}
//4."!"后面只能是“+-*/^)”中的一个
if (str.charAt(i) == '!' && "+-*/^)".indexOf(str.charAt(i + 1)) == -1){
jTextField1.setText("输入错误！");
indexYN = 1;
}
//5."losctg"后面只能是“0123456789(ep”中的一个
if ("losctg".indexOf(str.charAt(i)) >= 0 && "0123456789(ep".indexOf(str.charAt(i + 1)) == -1){
jTextField1.setText("输入错误！");
indexYN = 1;
}
//6."0"的判断操作
if (str.charAt(0) == '0' && str.charAt(1) == '0'){
jTextField1.setText("输入错误！");
indexYN = 1;
}
if (i >= 1 && str.charAt(i) == '0'){
//&& str.charAt(0) == '0' && str.charAt(1) == '0'
int m = i;
int n = i;
int is = 0;
//1.当0的上一个字符不为"0123456789."时，后一位只能是“+-*/.!^)”中的一个
if ("0123456789.".indexOf(str.charAt(m - 1)) == -1 && "+-*/.!^)".indexOf(str.charAt(i + 1)) == -1){
jTextField1.setText("输入错误！");
indexYN = 1;
}
//2.如果0的上一位为“.”,则后一位只能是“0123456789+-*/.^)”中的一个
if (str.charAt(m - 1) == '.' && "0123456789+-*/.^)".indexOf(str.charAt(i + 1)) == -1){
jTextField1.setText("输入错误！");
indexYN = 1;
}
n -= 1;
while (n > 0){
if ("(+-*/^glosct".indexOf(str.charAt(n)) >= 0){
break;
}
if (str.charAt(n) == '.'){
is++;
}
n--;
}
//3.如果0到上一个运算符之间没有“.”的话，整数位第一个只能是“123456789”，
// 且后一位只能是“0123456789+-*/.!^)”中的一个。
if ((is == 0 && str.charAt(n) == '0') || "0123456789+-*/.!^)".indexOf(str.charAt(i + 1)) == -1){
jTextField1.setText("输入错误！");
indexYN = 1;
}
//4.如果0到上一个运算符之间有一个“.”的话,则后一位只能是“0123456789+-*/.^)”中的一个
if (is == 1 && "0123456789+-*/.^)".indexOf(str.charAt(i + 1)) == -1){
jTextField1.setText("输入错误！");
indexYN = 1;
}
if (is > 1){
jTextField1.setText("输入错误！");
indexYN = 1;
}
}
//7."123456789"后面只能是“0123456789+-*/.!^)”中的一个
if ("123456789".indexOf(str.charAt(i)) >= 0 && "0123456789+-*/.!^)".indexOf(str.charAt(i + 1)) == -1){
jTextField1.setText("输入错误！");
indexYN = 1;
}
//8."("后面只能是“0123456789locstg()ep”中的一个
if (str.charAt(i) == '(' && "0123456789locstg()ep".indexOf(str.charAt(i + 1)) == -1){
jTextField1.setText("输入错误！");
indexYN = 1;
}
//9.")"后面只能是“+-*/!^)”中的一个
if (str.charAt(i) == ')' && "+-*/!^)".indexOf(str.charAt(i + 1)) == -1){
jTextField1.setText("输入错误！");
indexYN = 1;
}
//10.最后一位字符只能是“0123456789!)ep”中的一个
if ("0123456789!)ep".indexOf(str.charAt(str.length() - 1)) == -1){
jTextField1.setText("输入错误！");
indexYN = 1;
}
//12.不能有多个“.”
if (i > 2 && str.charAt(i) == '.'){
int n = i - 1;
int is = 0;
while (n > 0){
if ("(+-*/^glosct".indexOf(str.charAt(n)) >= 0){
break;
}
if (str.charAt(n) == '.'){
is++;
}
n--;
}
if (is > 0){
jTextField1.setText("输入错误！");
indexYN = 1;
}
}
//13."ep"后面只能是“+-*/^)”中的一个
if ("ep".indexOf(str.charAt(i)) >= 0 && "+-*/^)".indexOf(str.charAt(i + 1)) == -1){
jTextField1.setText("输入错误！");
indexYN = 1;
}
}
}
}
4.计算后缀表达式
代码如下：
public double math(List<String> list2) {//通过后缀表达式进行计算
Stack<String> stack = new Stack<String>();
for (int i = 0; i < list2.size(); i++) {
if (isNumber(list2.get(i))) {
if (list2.get(i).charAt(0) == 'e'){
stack.push(String.valueOf(Math.E));
} else if (list2.get(i).charAt(0) == 'p'){
stack.push(String.valueOf(Math.PI));
} else {
stack.push(list2.get(i));
}
} else if (isOperator(list2.get(i))){
double res = 0;
if (list2.get(i).equals("+")) {
double num2 = Double.parseDouble(stack.pop());
double num1 = Double.parseDouble(stack.pop());
res = num1 + num2;
} else if (list2.get(i).equals("-")) {
double num2 = Double.parseDouble(stack.pop());
double num1 = Double.parseDouble(stack.pop());
res = num1 - num2;
} else if (list2.get(i).equals("*")) {
double num2 = Double.parseDouble(stack.pop());
double num1 = Double.parseDouble(stack.pop());
res = num1 * num2;
} else if (list2.get(i).equals("/")) {
double num2 = Double.parseDouble(stack.pop());
double num1 = Double.parseDouble(stack.pop());
if (num2 != 0){
res = num1 / num2;
} else {
jTextField1.setText("除数不能为0");
indexYN = 1;
}
} else if (list2.get(i).equals("^")) {
double num2 = Double.parseDouble(stack.pop());
double num1 = Double.parseDouble(stack.pop());
res = Math.pow(num1, num2);
} else if (list2.get(i).equals("!")) {
double num1 = Double.parseDouble(stack.pop());
if (num1 == 0 || num1 == 1){
res = 1;
} else if (num1 == (int)num1 && num1 > 1){
int d = 1;
for (int j = (int)num1; j >0; j--) {
d *= j;
}
res = d;
} else {
jTextField1.setText("阶乘必须为自然数");
indexYN = 1;
}
} else if (list2.get(i).equals("g")) {
double num1 = Double.parseDouble(stack.pop());
res = Math.sqrt(num1);
} else if (list2.get(i).equals("l")) {
double num1 = Double.parseDouble(stack.pop());
if (num1 > 0){
res = Math.log(num1);
} else {
jTextField1.setText("ln的x必须大于0");
indexYN = 1;
}
} else if (list2.get(i).equals("o")) {
double num1 = Double.parseDouble(stack.pop());
if (num1 > 0){
res = Math.log(num1) / Math.log(2);
} else {
jTextField1.setText("log的x必须大于0");
indexYN = 1;
}
} else if (list2.get(i).equals("s")) {
double num1 = Double.parseDouble(stack.pop());
res = Math.sin(num1);
} else if (list2.get(i).equals("c")) {
double num1 = Double.parseDouble(stack.pop());
res = Math.cos(num1);
} else if (list2.get(i).equals("t")) {
double num1 = Double.parseDouble(stack.pop());
if (Math.cos(num1) != 0){
res = Math.tan(num1);
} else {
jTextField1.setText("tan的x不能为+-(π/2 + kπ)");
indexYN = 1;
}
}
stack.push("" + res);
}
}
if (indexYN == 0){
if (!stack.isEmpty()){
return Double.parseDouble(stack.pop());
} else {
return 0;
}
} else {
return -999999;
}
}
public void zhanDui(){//进行计算，并且判断括号是否匹配
String khao = "";
int leftkh = 0;
int rightkh = 0;
int m = 0;
//判断括号是否成对
for (int i = 0; i < str.length(); i++) {
if (str.charAt(i) == '('){
khao += '(';
leftkh++;
}
if (str.charAt(i) == ')'){
khao += ')';
rightkh++;
}
}
if (leftkh != rightkh){
jTextField1.setText("输入错误！括号不匹配");
indexYN = 1;
}
if ((leftkh == 0 && rightkh == 0) || ((leftkh == rightkh && leftkh > 0) && khao.charAt(0) == '(' && khao.charAt(khao.length() - 1) == ')')){
if (indexYN == 0){
List<String> list1 = zhongZhui(str);
//System.out.println(list1);
List<String> list2 = houZhui(list1);
//System.out.println(list2);
if (indexYN == 0){
if (math(list2) == -999999){
jTextField1.setText(jTextField1.getText());
} else {
jTextField1.setText(String.valueOf(math(list2)));
jTextField2.setText(String.valueOf(math(list2)));
jTextField2.setText(String.valueOf(math(list2)));
}
}
}
} else {
jTextField1.setText("输入错误！括号不匹配");
indexYN = 1;
}
}
5.事件 *
因为设置了33个按钮，所以每个按钮都要设计事件 * ，我设置的目的是把点中的按钮的值写入到文本框中输出，并且把它代表的数值或者操作符存放到字符串中，以便于进行中缀转后缀和运算。
代码如下：
public void buttonLister(){//事件 *
int tep = 0;
buttons[tep++].addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
jTextField1.setText(jTextField1.getText() + "(");
str += "(";
}
});
buttons[tep++].addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
jTextField1.setText(jTextField1.getText() + ")");
str += ")";
}
});
buttons[tep++].addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
jTextField1.setText(jTextField1.getText() + "1/");
str += "1/";
}
});
buttons[tep++].addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
jTextField1.setText(jTextField1.getText() + "^2");
str += "^2";
}
});
buttons[tep++].addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
jTextField1.setText(jTextField1.getText() + "^3");
str += "^3";
}
});
buttons[tep++].addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
jTextField1.setText(jTextField1.getText() + "^");
str += "^";
}
});
buttons[tep++].addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
jTextField1.setText(jTextField1.getText() + "!");
str += "!";
}
});
buttons[tep++].addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
jTextField1.setText(jTextField1.getText() + "√");
str += "g";
}
});
buttons[tep++].addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
jTextField1.setText(jTextField1.getText() + "e");
str += "e";
//str += "2.7182818284590452354";
}
});
buttons[tep++].addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
jTextField1.setText(jTextField1.getText() + "ln");
str += "l";
}
});
buttons[tep++].addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
jTextField1.setText(jTextField1.getText() + "log");
str += "o";
}
});
buttons[tep++].addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
jTextField1.setText(jTextField1.getText() + "％");
str += "*0.01";
}
});
buttons[tep++].addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
jTextField1.setText(jTextField1.getText() + "sin");
str += "s";
}
});
buttons[tep++].addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
jTextField1.setText(jTextField1.getText() + "cos");
str += "c";
}
});
buttons[tep++].addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
jTextField1.setText(jTextField1.getText() + "tan");
str += "t";
}
});
buttons[tep++].addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
jTextField1.setText(jTextField1.getText() + "π");
str += "p";
}
});
buttons[tep++].addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
jTextField1.setText(jTextField1.getText() + "+");
str += "+";
}
});
buttons[tep++].addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
if (str != ""){
estimate();
zhanDui();
} else {
str = "";
}
}
});
buttons[tep++].addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
jTextField1.setText(jTextField1.getText() + "7");
str += "7";
}
});
buttons[tep++].addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
jTextField1.setText(jTextField1.getText() + "8");
str += "8";
}
});
buttons[tep++].addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
jTextField1.setText(jTextField1.getText() + "9");
str += "9";
}
});
buttons[tep++].addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
jTextField1.setText(jTextField1.getText() + "0");
str += "0";
}
});
buttons[tep++].addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
jTextField1.setText(jTextField1.getText() + "-");
str += "-";
}
});
buttons[tep++].addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
jTextField1.setText(jTextField1.getText() + "4");
str += "4";
}
});
buttons[tep++].addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
jTextField1.setText(jTextField1.getText() + "5");
str += "5";
}
});
buttons[tep++].addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
jTextField1.setText(jTextField1.getText() + "6");
str += "6";
}
});
buttons[tep++].addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
jTextField1.setText(jTextField1.getText() + ".");
str += ".";
}
});
buttons[tep++].addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
jTextField1.setText(jTextField1.getText() + "*");
str += "*";
}
});
buttons[tep++].addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
jTextField1.setText(jTextField1.getText() + "1");
str += "1";
}
});
buttons[tep++].addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
jTextField1.setText(jTextField1.getText() + "2");
str += "2";
}
});
buttons[tep++].addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
jTextField1.setText(jTextField1.getText() + "3");
str += "3";
}
});
buttons[tep++].addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
jTextField1.setText("");
str = "";
indexYN = 0;
}
});
buttons[tep].addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
jTextField1.setText(jTextField1.getText() + "÷");
str += "/";
}
});
}
完整代码
直接拷贝到Java中就可以用：
一个类走完程序。
main函数中还可以设置面板风格。有
Niumbus风格
Windows风格
Windows经典风格
三种风格可以自定义选择，我个人觉得Niumbus风格比较好看。选择哪一个就释放哪一个，把另外两个注释掉就可以了。
package com.lmdxyt;
import javax.swing.*;
import javax.swing.plaf.FontUIResource;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.util.ArrayList;
import java.util.List;
import java.util.Stack;
public class JSQ {
private JFrame jFrame = new JFrame("计算器");
private FontUIResource f = new FontUIResource("隶书", 1, 20);
private FontUIResource f1 = new FontUIResource("楷书", 0, 35);
private JPanel jPanel = new JPanel();
private int buttonx = 100;
private int buttony = 50;
private int yy = 50;
private JTextField jTextField1 = new JTextField("0", 30);
private JTextField jTextField2 = new JTextField("输入要求在main()中", 30);
private String str = "";
private String temp = "";
private int indexYN = 0;
private String[] strings = {
"(", ")", "1/x", "x^2", "x^3", "x^y",
"x!", "√", "e", "ln", "log", "％",
"sin", "cos", "tan", "π", "+", "=",
"7", "8", "9", "0", "-",
"4", "5", "6", ".", "*",
"1", "2", "3", "c", "÷"
};
private JButton[] buttons = new JButton[33];
public void loAsi(){
int tep = 0;
for (int i = 0; i < 3; i++) {
for (int j = 0; j < 6; j++) {
buttons[tep] = new JButton(strings[tep]);
buttons[tep].setFont(f);
buttons[tep++].setFocusable(false);
}
}
for (int i = 0; i < 3; i++) {
for (int j = 0; j < 5; j++) {
buttons[tep] = new JButton(strings[tep]);
buttons[tep].setFont(f);
buttons[tep++].setFocusable(false);
}
}
int lo = 0;
for (int i = 0; i < 2; i++) {
for (int j = 0; j < 6; j++) {
buttons[lo++].setBounds(buttonx * j, yy * (2 + i), buttonx, buttony);
}
}
for (int i = 0; i < 5; i++) {
buttons[lo++].setBounds(buttonx * i, yy * 4, buttonx, buttony);
}
buttons[lo++].setBounds(buttonx * 5, yy * 4, buttonx, buttony * 4);
for (int i = 0; i < 3; i++) {
for (int j = 0; j < 5; j++) {
buttons[lo++].setBounds(buttonx * j, yy * (5 + i), buttonx, buttony);
}
}
jTextField1.setBounds(0, yy, 600, yy);
jTextField1.setFont(f1);
jTextField1.setHorizontalAlignment(JLabel.RIGHT);
jTextField1.setEditable(false);
jTextField1.setBackground(Color.WHITE);
jTextField2.setBounds(0, 0, 600, yy);
jTextField2.setFont(f1);
jTextField2.setHorizontalAlignment(JLabel.RIGHT);
jTextField2.setEditable(false);
jTextField2.setBackground(Color.WHITE);
}
public void initButton(){//把按钮添加到jPanel中
this.loAsi();
jPanel.add(jTextField1);
jPanel.add(jTextField2);
for (int i = 0; i < buttons.length; i++) {
jPanel.add(buttons[i]);
}
jPanel.setLayout(null);
}
private List<String> zhongZhui(String str) {//把输入的字符串转换成中缀表达式。存入list中
int index = 0;
List<String> list = new ArrayList<>();
do{
char ch = str.charAt(index);
if("+-*/^!logsct()".indexOf(str.charAt(index)) >= 0){
//是操作符，直接添加至list中
index ++;
list.add(ch+"");
}else if (str.charAt(index) == 'e' || str.charAt(index) == 'p'){
index ++;
list.add(ch+"");
} else if("0123456789".indexOf(str.charAt(index)) >= 0){
//是数字,判断多位数的情况
String str1 = "";
while (index < str.length() && "0123456789.".indexOf(str.charAt(index)) >= 0){
str1 += str.charAt(index);
index ++;
}
list.add(str1);
}
}while (index < str.length());
return list;
}
public List<String> houZhui(List<String> list){//中缀表达式转换称后缀表达式
Stack<String> fuZhan = new Stack<>();
List<String> list2 = new ArrayList<>();
if (!list.isEmpty()) {
for (int i = 0; i < list.size(); i++) {
if (isNumber(list.get(i))){
list2.add(list.get(i));
} else if (list.get(i).charAt(0) == '('){
fuZhan.push(list.get(i));
} else if (isOperator(list.get(i)) && list.get(i).charAt(0) != '('){
if (fuZhan.isEmpty()){
fuZhan.push(list.get(i));
} else {//符栈不为空
if (list.get(i).charAt(0) != ')'){
if (adv(fuZhan.peek()) <= adv(list.get(i))){
//入栈
fuZhan.push(list.get(i));
} else {//出栈
while (!fuZhan.isEmpty() && !"(".equals(fuZhan.peek())){
if(adv(list.get(i)) <= adv(fuZhan.peek())){
list2.add(fuZhan.pop());
}
}
if (fuZhan.isEmpty() || fuZhan.peek().charAt(0) == '('){
fuZhan.push(list.get(i));
}
}
} else if (list.get(i).charAt(0) == ')'){
while (fuZhan.peek().charAt(0) != '('){
list2.add(fuZhan.pop());
}
fuZhan.pop();
}
}
}
}
while (!fuZhan.isEmpty()){
list2.add(fuZhan.pop());
}
} else {
jTextField1.setText("");
}
return list2;
}
public static boolean isOperator(String op){//判断是否为操作符
if ("0123456789.ep".indexOf(op.charAt(0)) == -1) {
return true;
} else {
return false;
}
}
public static boolean isNumber(String num){//判断是否为操作数
if ("0123456789ep".indexOf(num.charAt(0)) >= 0) {
return true;
} else {
return false;
}
}
public static int adv(String f){//判断操作符的优先级
int result = 0;
switch(f) {
case "+":
result = 1;
break;
case "-":
result = 1;
break;
case "*":
result = 2;
break;
case "/":
result = 2;
break;
case "^":
result = 3;
break;
case "!":
result = 4;
break;
case "g":
result = 4;
break;
case "l":
result = 4;
break;
case "o":
result = 4;
break;
case "s":
result = 4;
break;
case "c":
result = 4;
break;
case "t":
result = 4;
break;
}
return result;
}
public void buttonLister(){//事件 *
int tep = 0;
buttons[tep++].addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
jTextField1.setText(jTextField1.getText() + "(");
str += "(";
}
});
buttons[tep++].addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
jTextField1.setText(jTextField1.getText() + ")");
str += ")";
}
});
buttons[tep++].addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
jTextField1.setText(jTextField1.getText() + "1/");
str += "1/";
}
});
buttons[tep++].addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
jTextField1.setText(jTextField1.getText() + "^2");
str += "^2";
}
});
buttons[tep++].addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
jTextField1.setText(jTextField1.getText() + "^3");
str += "^3";
}
});
buttons[tep++].addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
jTextField1.setText(jTextField1.getText() + "^");
str += "^";
}
});
buttons[tep++].addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
jTextField1.setText(jTextField1.getText() + "!");
str += "!";
}
});
buttons[tep++].addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
jTextField1.setText(jTextField1.getText() + "√");
str += "g";
}
});
buttons[tep++].addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
jTextField1.setText(jTextField1.getText() + "e");
str += "e";
//str += "2.7182818284590452354";
}
});
buttons[tep++].addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
jTextField1.setText(jTextField1.getText() + "ln");
str += "l";
}
});
buttons[tep++].addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
jTextField1.setText(jTextField1.getText() + "log");
str += "o";
}
});
buttons[tep++].addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
jTextField1.setText(jTextField1.getText() + "％");
str += "*0.01";
}
});
buttons[tep++].addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
jTextField1.setText(jTextField1.getText() + "sin");
str += "s";
}
});
buttons[tep++].addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
jTextField1.setText(jTextField1.getText() + "cos");
str += "c";
}
});
buttons[tep++].addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
jTextField1.setText(jTextField1.getText() + "tan");
str += "t";
}
});
buttons[tep++].addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
jTextField1.setText(jTextField1.getText() + "π");
str += "p";
}
});
buttons[tep++].addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
jTextField1.setText(jTextField1.getText() + "+");
str += "+";
}
});
buttons[tep++].addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
if (str != ""){
estimate();
zhanDui();
} else {
str = "";
}
}
});
buttons[tep++].addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
jTextField1.setText(jTextField1.getText() + "7");
str += "7";
}
});
buttons[tep++].addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
jTextField1.setText(jTextField1.getText() + "8");
str += "8";
}
});
buttons[tep++].addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
jTextField1.setText(jTextField1.getText() + "9");
str += "9";
}
});
buttons[tep++].addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
jTextField1.setText(jTextField1.getText() + "0");
str += "0";
}
});
buttons[tep++].addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
jTextField1.setText(jTextField1.getText() + "-");
str += "-";
}
});
buttons[tep++].addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
jTextField1.setText(jTextField1.getText() + "4");
str += "4";
}
});
buttons[tep++].addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
jTextField1.setText(jTextField1.getText() + "5");
str += "5";
}
});
buttons[tep++].addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
jTextField1.setText(jTextField1.getText() + "6");
str += "6";
}
});
buttons[tep++].addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
jTextField1.setText(jTextField1.getText() + ".");
str += ".";
}
});
buttons[tep++].addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
jTextField1.setText(jTextField1.getText() + "*");
str += "*";
}
});
buttons[tep++].addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
jTextField1.setText(jTextField1.getText() + "1");
str += "1";
}
});
buttons[tep++].addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
jTextField1.setText(jTextField1.getText() + "2");
str += "2";
}
});
buttons[tep++].addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
jTextField1.setText(jTextField1.getText() + "3");
str += "3";
}
});
buttons[tep++].addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
jTextField1.setText("");
str = "";
indexYN = 0;
}
});
buttons[tep].addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
jTextField1.setText(jTextField1.getText() + "÷");
str += "/";
}
});
}
public void init(){
this.initButton();
this.buttonLister();
jFrame.add(jPanel);
jFrame.setSize(614, 437);
jFrame.setResizable(false);
jFrame.setLocationRelativeTo(null);
jFrame.addWindowListener(new WindowAdapter() {
@Override
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
jFrame.setVisible(true);
}
public void estimate(){//判断输入是否错误
int i = 0;
if (str.length() == 0){
}
if (str.length() == 1){
//当只有一位字符时，只能是“0123456789ep”中的一个
if ("0123456789ep".indexOf(str.charAt(0)) == -1){
jTextField1.setText("输入错误！");
indexYN = 1;
}
}
if (str.length() > 1){
for (i = 0; i < str.length() - 1; i++) {
//1.第一个字符只能为"losctg(0123456789ep"中的一个
if ("losctg(0123456789ep".indexOf(str.charAt(0)) == -1){
jTextField1.setText("输入错误！");
indexYN = 1;
}
//2.“+-*/”后面只能是"0123456789losctg(ep"中的一个
if ("+-*/".indexOf(str.charAt(i)) >= 0 && "0123456789losctg(ep".indexOf(str.charAt(i + 1)) == -1){
jTextField1.setText("输入错误！");
indexYN = 1;
}
//3."."后面只能是“0123456789”中的一个
if (str.charAt(i) == '.' && "0123456789".indexOf(str.charAt(i + 1)) == -1){
jTextField1.setText("输入错误！");
indexYN = 1;
}
//4."!"后面只能是“+-*/^)”中的一个
if (str.charAt(i) == '!' && "+-*/^)".indexOf(str.charAt(i + 1)) == -1){
jTextField1.setText("输入错误！");
indexYN = 1;
}
//5."losctg"后面只能是“0123456789(ep”中的一个
if ("losctg".indexOf(str.charAt(i)) >= 0 && "0123456789(ep".indexOf(str.charAt(i + 1)) == -1){
jTextField1.setText("输入错误！");
indexYN = 1;
}
//6."0"的判断操作
if (str.charAt(0) == '0' && str.charAt(1) == '0'){
jTextField1.setText("输入错误！");
indexYN = 1;
}
if (i >= 1 && str.charAt(i) == '0'){
//&& str.charAt(0) == '0' && str.charAt(1) == '0'
int m = i;
int n = i;
int is = 0;
//1.当0的上一个字符不为"0123456789."时，后一位只能是“+-*/.!^)”中的一个
if ("0123456789.".indexOf(str.charAt(m - 1)) == -1 && "+-*/.!^)".indexOf(str.charAt(i + 1)) == -1){
jTextField1.setText("输入错误！");
indexYN = 1;
}
//2.如果0的上一位为“.”,则后一位只能是“0123456789+-*/.^)”中的一个
if (str.charAt(m - 1) == '.' && "0123456789+-*/.^)".indexOf(str.charAt(i + 1)) == -1){
jTextField1.setText("输入错误！");
indexYN = 1;
}
n -= 1;
while (n > 0){
if ("(+-*/^glosct".indexOf(str.charAt(n)) >= 0){
break;
}
if (str.charAt(n) == '.'){
is++;
}
n--;
}
//3.如果0到上一个运算符之间没有“.”的话，整数位第一个只能是“123456789”，
// 且后一位只能是“0123456789+-*/.!^)”中的一个。
if ((is == 0 && str.charAt(n) == '0') || "0123456789+-*/.!^)".indexOf(str.charAt(i + 1)) == -1){
jTextField1.setText("输入错误！");
indexYN = 1;
}
//4.如果0到上一个运算符之间有一个“.”的话,则后一位只能是“0123456789+-*/.^)”中的一个
if (is == 1 && "0123456789+-*/.^)".indexOf(str.charAt(i + 1)) == -1){
jTextField1.setText("输入错误！");
indexYN = 1;
}
if (is > 1){
jTextField1.setText("输入错误！");
indexYN = 1;
}
}
//7."123456789"后面只能是“0123456789+-*/.!^)”中的一个
if ("123456789".indexOf(str.charAt(i)) >= 0 && "0123456789+-*/.!^)".indexOf(str.charAt(i + 1)) == -1){
jTextField1.setText("输入错误！");
indexYN = 1;
}
//8."("后面只能是“0123456789locstg()ep”中的一个
if (str.charAt(i) == '(' && "0123456789locstg()ep".indexOf(str.charAt(i + 1)) == -1){
jTextField1.setText("输入错误！");
indexYN = 1;
}
//9.")"后面只能是“+-*/!^)”中的一个
if (str.charAt(i) == ')' && "+-*/!^)".indexOf(str.charAt(i + 1)) == -1){
jTextField1.setText("输入错误！");
indexYN = 1;
}
//10.最后一位字符只能是“0123456789!)ep”中的一个
if ("0123456789!)ep".indexOf(str.charAt(str.length() - 1)) == -1){
jTextField1.setText("输入错误！");
indexYN = 1;
}
//12.不能有多个“.”
if (i > 2 && str.charAt(i) == '.'){
int n = i - 1;
int is = 0;
while (n > 0){
if ("(+-*/^glosct".indexOf(str.charAt(n)) >= 0){
break;
}
if (str.charAt(n) == '.'){
is++;
}
n--;
}
if (is > 0){
jTextField1.setText("输入错误！");
indexYN = 1;
}
}
//13."ep"后面只能是“+-*/^)”中的一个
if ("ep".indexOf(str.charAt(i)) >= 0 && "+-*/^)".indexOf(str.charAt(i + 1)) == -1){
jTextField1.setText("输入错误！");
indexYN = 1;
}
}
}
}
public double math(List<String> list2) {//通过后缀表达式进行计算
Stack<String> stack = new Stack<String>();
for (int i = 0; i < list2.size(); i++) {
if (isNumber(list2.get(i))) {
if (list2.get(i).charAt(0) == 'e'){
stack.push(String.valueOf(Math.E));
} else if (list2.get(i).charAt(0) == 'p'){
stack.push(String.valueOf(Math.PI));
} else {
stack.push(list2.get(i));
}
} else if (isOperator(list2.get(i))){
double res = 0;
if (list2.get(i).equals("+")) {
double num2 = Double.parseDouble(stack.pop());
double num1 = Double.parseDouble(stack.pop());
res = num1 + num2;
} else if (list2.get(i).equals("-")) {
double num2 = Double.parseDouble(stack.pop());
double num1 = Double.parseDouble(stack.pop());
res = num1 - num2;
} else if (list2.get(i).equals("*")) {
double num2 = Double.parseDouble(stack.pop());
double num1 = Double.parseDouble(stack.pop());
res = num1 * num2;
} else if (list2.get(i).equals("/")) {
double num2 = Double.parseDouble(stack.pop());
double num1 = Double.parseDouble(stack.pop());
if (num2 != 0){
res = num1 / num2;
} else {
jTextField1.setText("除数不能为0");
indexYN = 1;
}
} else if (list2.get(i).equals("^")) {
double num2 = Double.parseDouble(stack.pop());
double num1 = Double.parseDouble(stack.pop());
res = Math.pow(num1, num2);
} else if (list2.get(i).equals("!")) {
double num1 = Double.parseDouble(stack.pop());
if (num1 == 0 || num1 == 1){
res = 1;
} else if (num1 == (int)num1 && num1 > 1){
int d = 1;
for (int j = (int)num1; j >0; j--) {
d *= j;
}
res = d;
} else {
jTextField1.setText("阶乘必须为自然数");
indexYN = 1;
}
} else if (list2.get(i).equals("g")) {
double num1 = Double.parseDouble(stack.pop());
res = Math.sqrt(num1);
} else if (list2.get(i).equals("l")) {
double num1 = Double.parseDouble(stack.pop());
if (num1 > 0){
res = Math.log(num1);
} else {
jTextField1.setText("ln的x必须大于0");
indexYN = 1;
}
} else if (list2.get(i).equals("o")) {
double num1 = Double.parseDouble(stack.pop());
if (num1 > 0){
res = Math.log(num1) / Math.log(2);
} else {
jTextField1.setText("log的x必须大于0");
indexYN = 1;
}
} else if (list2.get(i).equals("s")) {
double num1 = Double.parseDouble(stack.pop());
res = Math.sin(num1);
} else if (list2.get(i).equals("c")) {
double num1 = Double.parseDouble(stack.pop());
res = Math.cos(num1);
} else if (list2.get(i).equals("t")) {
double num1 = Double.parseDouble(stack.pop());
if (Math.cos(num1) != 0){
res = Math.tan(num1);
} else {
jTextField1.setText("tan的x不能为+-(π/2 + kπ)");
indexYN = 1;
}
}
stack.push("" + res);
}
}
if (indexYN == 0){
if (!stack.isEmpty()){
return Double.parseDouble(stack.pop());
} else {
return 0;
}
} else {
return -999999;
}
}
public void zhanDui(){//进行计算，并且判断括号是否匹配
String khao = "";
int leftkh = 0;
int rightkh = 0;
int m = 0;
//判断括号是否成对
for (int i = 0; i < str.length(); i++) {
if (str.charAt(i) == '('){
khao += '(';
leftkh++;
}
if (str.charAt(i) == ')'){
khao += ')';
rightkh++;
}
}
if (leftkh != rightkh){
jTextField1.setText("输入错误！括号不匹配");
indexYN = 1;
}
if ((leftkh == 0 && rightkh == 0) || ((leftkh == rightkh && leftkh > 0) && khao.charAt(0) == '(' && khao.charAt(khao.length() - 1) == ')')){
if (indexYN == 0){
List<String> list1 = zhongZhui(str);
//System.out.println(list1);
List<String> list2 = houZhui(list1);
//System.out.println(list2);
if (indexYN == 0){
if (math(list2) == -999999){
jTextField1.setText(jTextField1.getText());
} else {
jTextField1.setText(String.valueOf(math(list2)));
jTextField2.setText(String.valueOf(math(list2)));
jTextField2.setText(String.valueOf(math(list2)));
}
}
}
} else {
jTextField1.setText("输入错误！括号不匹配");
indexYN = 1;
}
}
public static void main(String[] args) {
/*
* 1.在输入过程中每两个数值之间必须有运算符，否则报错.
* 例如：错误：2ln4(5+8), 2sin2 等
* 正确：2*ln4*(5+8)， 2*sin2
* 2.不支持负数，要想得到负数，只能0-x
* 例如：错误：-2+3*(-2*6)
* 正确：0-2+3*((0-2)+6)
* */
new JSQ().init();
//Niumbus风格
try {
UIManager.setLookAndFeel("javax.swing.plaf.nimbus.NimbusLookAndFeel");
} catch (ClassNotFoundException ex) {
ex.printStackTrace();
} catch (InstantiationException ex) {
ex.printStackTrace();
} catch (IllegalAccessException ex) {
ex.printStackTrace();
} catch (UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
}
/*//Windows风格
try {
UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
} catch (ClassNotFoundException ex) {
ex.printStackTrace();
} catch (InstantiationException ex) {
ex.printStackTrace();
} catch (IllegalAccessException ex) {
ex.printStackTrace();
} catch (UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
}*/
/* //Windows经典风格
try {
UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsClassicLookAndFeel");
} catch (ClassNotFoundException ex) {
ex.printStackTrace();
} catch (InstantiationException ex) {
ex.printStackTrace();
} catch (IllegalAccessException ex) {
ex.printStackTrace();
} catch (UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
}*/
}
}
来源：https://blog.csdn.net/lmdxyZYR/article/details/120837318
标签：java,科学计算器
0
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