java 设计作业——简单计算器

╰+攻爆jí腚メ 2022-08-10 09:47 432阅读 0赞

设计要求：

设计一个计算器，用GUI画出来一个图形界面，有两个输入框，一个输出框，有4个加减乘除按钮，实现简单的加减乘除功能。

code：

import java.awt.*;
    import java.awt.event.*;
    import java.io.*;
    import java.util.*;
    
    
    public class cal extends Frame implements ActionListener
    {
    	private Button plus,minus,mul,div;
    	private TextField Text1,Text2,Text3;
    	private int a,b;
    	
    	public cal(){
    	 super("计算器小程序");
    	 
         plus=new Button("+");
         minus=new Button("-");
    	 mul=new Button("*");
    	 div=new Button("/");
    	 
        
         Text1=new TextField("输入第一个数",20);
    	 Text2=new TextField("输入第二个数",20);
    	 Text3=new TextField("结果",20);
         //Text1.setEditable(false); 
    
          	this.setSize(300,200);
          	this.setBackground(Color.blue);
            this.setLocation(300,240);
            this.setLayout(new FlowLayout(FlowLayout.LEFT));
            
    		this.add(Text1);
    		this.add(Text2);
    		this.add(Text3);
            this.add(plus); 
    		this.add(minus); 
    		this.add(mul);
    		this.add(div);
    		
            
    		plus.addActionListener(this);
    		minus.addActionListener(this);
    		mul.addActionListener(this);
            div.addActionListener(this);
            this.addWindowListener(new Wadapt());
    		
            this.setVisible(true); 
        }
    	
    	public void actionPerformed(ActionEvent e)
        {
    		a = Integer.parseInt(Text1.getText());
    		b = Integer.parseInt(Text2.getText());
           if(e.getSource()==plus){
    		   String s = String.valueOf(a+b);
    			Text3.setText(s);}
    	   else if(e.getSource()==minus){
    		   String s = String.valueOf(a-b);
    			Text3.setText(s);}
    	   else if(e.getSource()==mul){
    		   String s = String.valueOf(a*b);
    			Text3.setText(s);}
    	   else if(e.getSource()==div){
    		   if (b==0) {Text3.setText("不合法的数据！");}
    		   else {
    		   String s = String.valueOf(a/b);
    			Text3.setText(s);}
    	   }  
        }
        public static void main(String args[])
        {
        	cal mycal=new cal();
        }
    }
    class Wadapt extends WindowAdapter
    {
        public void windowClosing(WindowEvent evt)
        {
            Frame frm=(Frame)evt.getSource();
            frm.setVisible(false);
            frm.dispose();
            System.exit(0);
        }
    }