Question

编写一个Java小应用程序，设计4个按钮，分别命名为“加”、“差”、“积”、“除”以及3个文本框。单击相

编写一个Java小应用程序，设计4个按钮，分别命名为“加”、“差”、“积”、“除”以及3个文本框。单击相应的按钮

Answer 1

..写了一个,不知是否符合...或者可以参考一下..import java.awt.*; import java.awt.event.*; public class JiSuanQi extends Frame implements ActionListener { TextField c1,c2,c3;//三个文本框 Button btn1,btn2,btn3,btn4;//四个按钮 double x,y,z;//三个变量 public JiSuanQi(){//外观super();setSize(150,200); setTitle("加减乘除"); //控件创建及注册监听 c1=new TextField(15); c1.addActionListener(this); c2=new TextField(15); c2.addActionListener(this); c3=new TextField(15); c3.addActionListener(this); btn1=new Button("加"); btn1.addActionListener(this); btn2=new Button("差"); btn2.addActionListener(this); btn3=new Button("积"); btn3.addActionListener(this); btn4=new Button("除"); btn4.addActionListener(this);//布局setLayout(new FlowLayout());add(c1);add(c2);add(c3);add(btn1);add(btn2);add(btn3);add(btn4);//关闭按钮addWindowListener(new WindowAdapter(){ y=Double.parseDouble(c2.getText());//加if(e.getSource()==btn1){z=x+y;c3.setText(Double.toString(z));}//差if(e.getSource()==btn2){z=x-y;c3.setText(Double.toString(z));}//积if(e.getSource()==btn3){z=x*y;c3.setText(Double.toString(z));}//除if(e.getSource()==btn4){z=x/y;c3.setText(Double.toString(z));}x=0;y=0;z=0; //清空变量}catch(NumberFormatException ee){

Answer 2

package anfang;

import java.awt.*;
import java.awt.event.*;

public class example1 extends Frame{
 Frame frm;
 Button btn1,btn2,btn3,btn4;
 TextField txt1,txt2,txt3;
    public example1()
    {
     setLayout(null);
     btn1 = new Button("+");
     btn1.setLocation(55,55);
     btn1.setSize(80,20);
     class BtnClick implements ActionListener
     {
      public void actionPerformed(ActionEvent e)
      {   
       txt3.setText(""+(Integer.parseInt(txt1.getText())+Integer.parseInt(txt2.getText())));
      }
     }
     BtnClick bc=new BtnClick();
     btn1.addActionListener(bc);
     add(btn1);
     btn2 = new Button("-");
     btn2.setLocation(50,100);
     btn2.setSize(80,20);
     class BtnClick1 implements ActionListener
     {
      public void actionPerformed(ActionEvent e)
      {   
       
       txt3.setText(""+(Integer.parseInt(txt1.getText())-Integer.parseInt(txt2.getText())));
      }
     }
     BtnClick1 bc1=new BtnClick1();
     btn2.addActionListener(bc1);
     add(btn2);
     btn3 = new Button("*");
     btn3.setLocation(50,150);
     btn3.setSize(80,20);
     class BtnClick2 implements ActionListener
     {
      public void actionPerformed(ActionEvent e)
      {   
       txt3.setText(""+Integer.parseInt(txt1.getText())*Integer.parseInt(txt2.getText()));
      }
     }
     BtnClick2 bc2=new BtnClick2();
     btn3.addActionListener(bc2);
     add(btn3);
     btn4 = new Button("/");
     btn4.setLocation(50,200);
     btn4.setSize(80,20);
     class BtnClick3 implements ActionListener
     {
      public void actionPerformed(ActionEvent e)
      {   
    
    txt3.setText(""+Integer.parseInt(txt1.getText())/Integer.parseInt(txt2.getText()));
      }
     }
     BtnClick3 bc3=new BtnClick3();
     btn4.addActionListener(bc3);
     add(btn4);
     txt1 = new TextField();
     txt1.setLocation(200,60);
     txt1.setSize(80,20);
     add(txt1);
     txt2 = new TextField();
     txt2.setLocation(200,120);
     txt2.setSize(80,20);
     add(txt2);
     txt3 = new TextField();
     txt3.setLocation(200,180);
     txt3.setSize(80,20);
     add(txt3);
    }
 public static void main(String[] args) {
  // TODO Auto-generated method stub
         example1 frm=new example1();
         frm.setSize(450,300);
         frm.show();
 }

}