用java编计算机_用Java编写一个计算机

用Java编写一个计算机

package com;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JPanel;

import javax.swing.JTextField;

import java.awt.BorderLayout;

import java.awt.GridLayout;

public class GUIDemol {

public static void main(String[] args){

Calculator f=new Calculator();

f.setTitle(“计算机”);

f.setSize(250,180);

f.setLocation(400,300);

f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

f.setVisible(true);

}

}

class Calculator extends JFrame implements ActionListener{

JTextField jt;

JButton jb1,jb2,jb3,jb4,jb5,jb6,jb7,jb8,jb9,jb0,jbdian,jbjia,jbjian,jbcheng,jbchu,jbdeng;

String flag;

double result=0;

double num1,num2;

Calculator(){

JPanel jp=new JPanel();

jp.setLayout(new GridLayout(4,4,4,4));

jb1=new JButton(“1”);

jb2=new JButton(“2”);

jb3=new JButton(“3”);

jb4=new JButton(“4”);

jb5=new JButton(“5”);

jb6=new JButton(“6”);

jb7=new JButton(“7”);

jb8=new JButton(“8”);

jb9=new JButton(“9”);

jb0=new JButton(“0”);

jbjia=new JButton("+");

jbjian=new JButton("-");

jbcheng=new JButton("*");

jbchu=new JButton("/");

jbdeng=new JButton("=");

jbdian=new JButton(".");

jp.add(jb1);

jp.add(jb2);

jp.add(jb3);

jp.add(jbjia);

jp.add(jb4);

jp.add(jb5);

jp.add(jb6);

jp.add(jbjian);

jp.add(jb7);

jp.add(jb8);

jp.add(jb9);

jp.add(jbcheng);

jp.add(jbdian);

jp.add(jb0);

jp.add(jbdeng);

jp.add(jbchu);

jt=new JTextField(20);

jt.setHorizontalAlignment(JTextField.RIGHT);

add(jt,BorderLayout.NORTH);

add(jp);

jb1.addActionListener(this);

jb2.addActionListener(this);

jb3.addActionListener(this);

jb4.addActionListener(this);

jb5.addActionListener(this);

jb6.addActionListener(this);

jb7.addActionListener(this);

jb8.addActionListener(this);

jb9.addActionListener(this);

jb0.addActionListener(this);

jbdian.addActionListener(this);

jbjia.addActionListener(this);

jbjian.addActionListener(this);

jbcheng.addActionListener(this);

jbchu.addActionListener(this);

jbdeng.addActionListener(this);

}

public void actionPerformed(ActionEvent e){

String s=jt.getText();

if(e.getSource()==jb1){

jt.setText(s+“1”);

} else if(e.getSource()==jb2){

jt.setText(s+“2”);

} else if(e.getSource()==jb3){

jt.setText(s+“3”);

} else if(e.getSource()==jb4){

jt.setText(s+“4”);

} else if(e.getSource()==jb5){

jt.setText(s+“5”);

} else if(e.getSource()==jb6){

jt.setText(s+“6”);

} else if(e.getSource()==jb7){

jt.setText(s+“7”);

} else if(e.getSource()==jb8){

jt.setText(s+“8”);

} else if(e.getSource()==jb9){

jt.setText(s+“9”);

} else if(e.getSource()==jb0){

jt.setText(s+“0”);

} else if(e.getSource()==jbdian){

jt.setText(s+".");

}

else if(e.getSource()==jbjia){

num1=Double.parseDouble(s);

flag=“jia”;

jt.setText("");

}else if(e.getSource()==jbjian){

num1=Double.parseDouble(s);

flag=“jian”;

jt.setText("");

}else if(e.getSource()==jbcheng){

num1=Double.parseDouble(s);

flag=“cheng”;

jt.setText("");

}else if(e.getSource()==jbchu){

num1=Double.parseDouble(s);

flag=“chu”;

jt.setText("");

}else if(e.getSource()==jbdeng){

num2=Double.parseDouble(s);

if(“jia”.equals(flag))

result=num1+num2;

else if(“jian”.equals(flag))

result=num1-num2;

else if(“cheng”.equals(flag))

result=num1*num2;

else if(“chu”.equals(flag))

result=num1/num2;

s=result+"";

jt.setText(s);

}

}

}

这个有一点缺陷麻烦有人帮我解决(实践后可知)

标签：Java,计算机,jt,jp,else,add,new,编写,JButton

来源： https://blog.youkuaiyun.com/yibmfff/article/details/111349463