窗口实训1

计算器

package shixun8;

import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.GridLayout;
import java.util.Scanner;

import javax.swing.*;
public class MyFrame { 
 
    JFrame jf; 
    JPanel jp;
    JButton[] b;
    String a[]={"7","8","9","/","4","5","6","*","1","2","3","-","0",".","=","+"};
    JTextField jt1;
    GridLayout c;
 public MyFrame() { 
        jf=new JFrame("");
        jp=new JPanel();
        b=new JButton[a.length];
        jp.setLayout(null);
        jt1=new JTextField();
        c=new GridLayout(4,4,5,5);
        jt1.setBounds(10,20,30,50);
        jf.setLocation(600,400);  
        jf.setSize(300,300);
        jf.add(jp,BorderLayout.CENTER);
        jf.add(jt1,BorderLayout.NORTH);
        jp.setLayout(c);
       for(int i=0;i<16;i++){
          b[i]=new JButton(a[i]);
       jp.add(b[i]);
       }
          jf.setVisible(true);  }
 public static void main(String[] args) { 
          new MyFrame();

 }

}

运行结果：

颜色变换

import java.awt.BorderLayout;
import java.awt.Color;
 import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.*;
 public class MyFrame1 implements ActionListener {
 JFrame jf;
 JPanel jp,jp2;
 JButton b1,b2,b3;
 
 public MyFrame1(){
 jf=new JFrame("窗口");
 jp=new JPanel();
 jp2=new JPanel();
 b1=new JButton("红色");
 b2=new JButton("蓝色");
 b3=new JButton("绿色");
 b1.addActionListener(this);
 b2.addActionListener(this);
 b3.addActionListener(this);
 jf.setLayout(new BorderLayout());
 jf.add(jp,BorderLayout.NORTH);
 jf.add(jp2,BorderLayout.CENTER);
 jp.add(b1);
 jp.add(b2);
 jp.add(b3);
jp2.setBackground(Color.PINK);
 jf.setVisible(true);
 jf.setSize(500, 400);
 jf.setLocation(500,500);
 }
 public static void main(String[]args) {
 new MyFrame1();
 }
public void actionPerformed(ActionEvent e) {
 // TODO Auto-generated method stub
 if(e.getSource()==b1)
  jp2.setBackground(Color.red);
 if(e.getSource()==b2)
  jp2.setBackground(Color.blue);
 if(e.getSource()==b3)
  jp2.setBackground(Color.green);
  
}}

运行结果