//package com.cal;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Stack;
import javax.swing.*;
class MyException extends Exception{
public MyException() {
super();
}
public MyException(String message) {
super(message);
}
}
class SwingConsole{
public static void run(final JFrame f,final int width,final int height){
SwingUtilities.invokeLater(new Runnable(){
public void run(){
f.setTitle(f.getClass().getSimpleName());
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setSize(width,height);
f.setVisible(true);
}
});
}
}
class MyCalculator extends JFrame{
/*
*
*/
private JTextField textField; //输入文本框
private String input; //结果
private String operator; //操作符
public MyCalculator() {
input = "";
operator = "";
Container container = this.getContentPane();
JPanel panel = new JPanel();
textField = new JTextField(30);
textField.setEditable(false); //文本框禁止编辑
textField.setHorizontalAlignment(JTextField.LEFT);
//textField.setBounds(100, 100, 20, 20); //在容器布局为空情况下生效
textField.setPreferredSize(new Dimension(200,30));
container.add(textField, BorderLayout.NORTH);
String[] name= {"7","8","9","+","4","5","6","-","1","2","3","*","0","C","=","/"};
panel.setLayout(new GridLayout(4,4,1,1));
for(int i=0;i<name.length;i++) {
JButton button = new JButton(name[i]);
button.addActionListener(new MyActionListener());
panel.add(button);
}
container.add(panel,BorderLayout.CENTER);
}
class MyActionListener implements ActionListener{ //内部类实现按钮响应
@Override
public void actionPerformed(ActionEvent e) {
int cnt=0;
String actionCommand = e.getActionCommand(); //获取按钮上的字符串
if(actionCommand.equals("+") || actionCommand.equals("-") || actionCommand.equals("*")
|| actionCommand.equals("/")) {
input += " " + actionCommand + " ";
}
else if(actionCommand.equals("C")) { //清除输入
input = "";
}
else if(actionCommand.equals("=")) { //按下等号
try {
input+= "="+calculate(input);
} catch (MyException e1) {
if(e1.getMessage().equals("Infinity"))
input+= "=" + e1.getMessage();
else
input = e1.getMessage();
}
textField.setText(input);
input="";
cnt = 1;
}
else
input += actionCommand; //按下数字
if(cnt == 0)
textField.setText(input);
}
}
private String calculate(String input) throws MyException{ //计算函数
String[] comput = input.split(" ");
Stack<Double> stack = new Stack<>();
Double m = Double.parseDouble(comput[0]);
stack.push(m); //第一个操作数入栈
for(int i = 1; i < comput.length; i++) {
if(i%2==1) {
if(comput[i].equals("+"))
stack.push(Double.parseDouble(comput[i+1]));
if(comput[i].equals("-"))
stack.push(-Double.parseDouble(comput[i+1]));
if(comput[i].equals("*")) { //将前一个数出栈做乘法再入栈
Double d = stack.peek(); //取栈顶元素
stack.pop();
stack.push(d*Double.parseDouble(comput[i+1]));
}
if(comput[i].equals("/")) { //将前一个数出栈做乘法再入栈
double help = Double.parseDouble(comput[i+1]);
if(help == 0)
throw new MyException("Infinity"); //不会继续执行该函数
double d = stack.peek();
stack.pop();
stack.push(d/help);
}
}
}
double d = 0d;
while(!stack.isEmpty()) { //求和
d += stack.peek();
stack.pop();
}
String result = String.valueOf(d);
return result;
}
public static void main(String[] args) {
SwingConsole.run(new MyCalculator(), 250, 300);
}
}
Java在线计算器源代码/在线界面/简易计算器/复杂计算器/各类计算器
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2023-11-16
11:34:18
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收藏 8KB RAR 举报
calculator.rar （10个子文件） 
test src 
a.java 5KB out production test MyCalculator$MyActionListener.class 2KB MyException.class 396B SwingConsole$1.class 930B SwingConsole.class 569B MyCalculator.class 4KB .idea workspace.xml 3KB misc.xml 278B modules.xml 255B test.iml 433B资源评论
