mybox.java

是一个综合开发程序,可以做为系统研究人员的参考

import java.awt.*;
import java.awt.event.*;
//import javax.swing.JOptionPane;
public class mybox{
    static Frame fram=new Frame("this is mybox");
    static Button but=new Button("计 算");
    static TextField text1 =new TextField();
    static TextField text2=new TextField();
    static TextField text3=new TextField();
    static Button exit=new Button("退 出");
    static Button creal=new Button("清 空");
    static Label lab4=new Label("");
    public static void main(String[] args){
        fram.setLayout(null);
        fram.setSize(280,280);
        fram.setLocation(350,150);
        Label lab1=new Label("长：");
        Label lab2=new Label("宽:");
        Label lab3=new Label("高:");
        Label lab=new Label("请输入你的数据：");
       
        lab.setBounds(40,40,100,20);
        lab1.setBounds(40,70,20,20);
        lab2.setBounds(40,100,20,20);
        lab3.setBounds(40,130,20,20);
        lab4.setBounds(30,220,160,20);
        text1.setBounds(90,70,80,20);
        text2.setBounds(90,100,80,20);
        text3.setBounds(90,130,80,20);
        but.setBounds(40,170,40,22);
        exit.setBounds(160,170,40,22);
        creal.setBounds(100,170,40,22);
        fram.add(lab);
        fram.add(lab1);
        fram.add(lab2);
        fram.add(lab3);
        fram.add(text1);
        fram.add(text2 );
        fram.add(text3);
        fram.add(but);
        fram.add(exit);
        fram.add(creal);
        fram.add(lab4);
        but.addActionListener(new action());
        exit.addActionListener(new action());
        creal.addActionListener(new action());
        fram.setVisible(true);
    }
  static class action implements ActionListener{
        public void actionPerformed(ActionEvent e){
            String a,b,c;
            int x,y,z,v;
            Button click=(Button)e.getSource();
            if (click==but)
            {a=text1.getText();
             b=text2.getText();
             c=text3.getText();
            // if (a==""||b==""||c=="")
             //JOptionPane.showMessageDialog(null,"this is not empty","liang",JOptionPane.QUESTION_MESSAGE);
             x=Integer.parseInt(a);
             y=Integer.parseInt(b);
             z=Integer.parseInt(c);
             v=x*y*z;
             lab4.setText("该立方体的体积为："+Integer.toString(v));
            }//Integer.toString(v)
            else if (click==creal)
            {text1.setText("");
            text2.setText("");
            text3.setText("");
            }
            else
            System.exit(0);
            
        }
    }
}