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Calculator.java
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package com.edu.ui;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import javax.swing.*;
public class Calculator {
public static void main(String[] args) {
MyFrame MyFrame=new MyFrame();
}
}
class MyFrame extends JFrame{
public static JTextField textField;
public static String result; //记录中间结果或者结果
public static String lastcommand; //记录最后一次运算符
public static boolean startflag; //是否是新运算开始
public MyFrame(){
setTitle("计算器");
result="";
lastcommand="=";
startflag=true;
setLocationRelativeTo(null);
setLayout(new BorderLayout()); //设置四周性布局
textField=new JTextField(10);
add(textField,BorderLayout.NORTH); //调整文本方向为上方
textField.setFont(new Font("Roman", Font.PLAIN, 35)); //字体大小
textField.setBackground(Color.gray); //文本框颜色
setBackground(Color.blue);
btnpanel btnpanel=new btnpanel();
add(btnpanel,BorderLayout.CENTER);
addWindowListener(new WindowAdapter() {
@Override
public void windowClosing(WindowEvent e) {
// TODO 自动生成的方法存根
}
});
setVisible(true);//窗体可见
pack(); //适应大小位置
}
}
class btnpanel extends JPanel{//按钮面板
public btnpanel(){
setLayout(new GridLayout(5,5));
Numaction numaction=new Numaction();//数字按钮事件
CommandAction CommandAction=new CommandAction();//+-/*运算事件
point point=new point(); //小数点处理事件
addButton("C",CommandAction);
addButton("CE",CommandAction);
addButton("sqrt",CommandAction);
addButton("/",CommandAction);
addButton("Back",CommandAction);
addButton("%",CommandAction);
addButton("7",numaction);
addButton("8",numaction);
addButton("9",numaction);
addButton("*",CommandAction);
addButton("m²",CommandAction);
addButton("4",numaction);
addButton("5",numaction);
addButton("6",numaction);
addButton("-",CommandAction);
addButton("m³",CommandAction);
addButton("1",numaction);
addButton("2",numaction);
addButton("3",numaction);
addButton("+",CommandAction);
addButton("M+",CommandAction);
addButton("0",numaction);
addButton("+/-",CommandAction);
addButton(".",point);
addButton("=",CommandAction);
}
public void addButton(String label,ActionListener listener){
JButton btn=new JButton(label);
btn.addActionListener(listener);//给按钮增加点击事件
btn.setPreferredSize(new Dimension(75,45)); //设置Jbutton格式
btn.setFont(new java.awt.Font("Courier",20,20)); //设置Jbutton字体大小 以及风格
btn.setBorder(BorderFactory.createRaisedBevelBorder()); //Jbutton凸起
if("1 2 3 4 5 6 7 8 9 0 . +/- M+ / * - + C CE sqrt ←".contains(label)){ //给所选数字按钮绑定
btn.setBackground(Color.WHITE); //设置按钮颜色 为白色
btn.setForeground(Color.BLACK); //设置字体颜色
}
if("= m² m³ M+ / * - + C CE sqrt Back %".contains(label)){
btn.setBackground(Color.BLUE.cyan);
btn.setForeground(Color.red);
}
add(btn);
}
}
class Numaction implements ActionListener{//数据按钮时间
@Override
public void actionPerformed(ActionEvent e) {
if(MyFrame.startflag==true){
MyFrame.textField.setText("");
MyFrame.startflag=false;
}
MyFrame.textField.setText(
MyFrame.textField.getText()+e.getActionCommand());
}
}
class point implements ActionListener{//
@Override
public void actionPerformed(ActionEvent e) {
if ((e.getActionCommand().equals(".")) && (MyFrame.textField.getText().indexOf(".") < 0)) {
// 输入的是小数点，并且之前没有小数点，则将小数点附在结果文本框的后面
MyFrame.textField.setText(MyFrame.textField.getText() + ".");
} else if (!e.getActionCommand().equals(".")) {
// 如果输入的不是小数点，则将数字附在结果文本框的后面
MyFrame.textField.setText(MyFrame.textField.getText() + e.getActionCommand());
}
return;
}
}
class CommandAction implements ActionListener {//实现+-*/=运算事件
@Override
public void actionPerformed(ActionEvent e) {//实现+运算事件
double rs = 0;
// TODO 自动生成的方法存根
if (e.getActionCommand().equals("=")) {
double a1 = Double.parseDouble(MyFrame.result);
double a2 = Double.parseDouble(MyFrame.textField.getText());
if (MyFrame.lastcommand.equals("+")) { // 加法运算
rs = a1 + a2;
System.out.println(a1+"+"+a2+"="+(a1+a2));
} else if (MyFrame.lastcommand.equals("-")) { // 减法运算
rs = a1 - a2;
System.out.println(a1+"-"+a2+"="+(a1-a2));
} else if (MyFrame.lastcommand.equals("*")) { // 乘法运算
rs = a1 * a2;
System.out.println(a1+"*"+a2+"="+(a1*a2));
} else if (MyFrame.lastcommand.equals("/")) { // 除法运算
rs = a1 / a2;
System.out.println(a1+"/"+a2+"="+(a1/a2));
} else if (MyFrame.lastcommand.equals("%")) {// 百分号运算，除以100
rs = a1 / 100;
} else if (MyFrame.lastcommand.equals("sqrt")) { // 平方根运算
rs = Math.sqrt(a1);
} else if (MyFrame.lastcommand.equals("+/-")) {// 正数负数运算
rs = a1 * (-1);
} else if (MyFrame.lastcommand.equals("m²")) {// 平方运算
rs = Math.pow(2, a1);
} else if (MyFrame.lastcommand.equals("m³")) {// 立方运算
rs = Math.pow(3, a1);
}
long t1;
double t2;
t1 = (long) rs;
t2 = rs - t1;
if (t2 == 0) {
MyFrame.textField.setText(String.valueOf(t1));
} else {
MyFrame.textField.setText(String.valueOf(rs));
}
MyFrame.lastcommand = "=";
} else if (e.getActionCommand().equals("C")) { //清空实现
MyFrame.textField.setText(" ");
} else if (e.getActionCommand().equals("CE")) {
MyFrame.textField.setText("0");
} else if (e.getActionCommand().equals("Back")) { //退格实现
MyFrame.textField.setText(MyFrame.textField.getText().substring(0,
MyFrame.textField.getText().length() - 1));
}
else {//+-*/
if (!MyFrame.lastcommand.equals("=")) {//连+-*/运算
double a1 = Double.parseDouble(MyFrame.result);
double a2 = Double.parseDouble(MyFrame.textField.getText());
if (MyFrame.lastcommand.equals("+")) {//连+实现
rs = a1 + a2;
}
else if (MyFrame.lastcommand.equals("-")) {//连-实现
rs = a1 - a2;
}
else if (MyFrame.lastcommand.equals("*")) {//连*实现
rs = a1 * a2;
}
else if (MyFrame.lastcommand.equals("/")) {//连/实现
rs = a1 / a2;
}
long t1;
double t2;
t1 = (long) rs;
t2 = rs - t1;
if (t2 == 0) {
MyFrame.textField.setText(String.valueOf(t1));
} else {
MyFrame.textField.setText(String.valueOf(rs));
}
}
MyFrame.result = MyFrame.textField.getText();//将界面值放入result
MyFrame.lastcommand = e.getActionCommand();//记录运算符
}
MyFrame.startflag = true;
}
}