package 第七次实训;
import java.awt.*;
import javax.swing.*;
public class 计算器 {
JFrame f;
JPanel p;
JButton[] b;
JTextField t;
String title[]= {"7","8","9","/","4","5","6","*","1","2","3","-","0",".","=","+"};
GridLayout q1;
public 计算器() {
f=new JFrame("计算机");
p=new JPanel();
b=new JButton[16];
t=new JTextField(10);
for(int i=0;i<16;i++) {
b[i]=new JButton(title[i]);
p.add(b[i]);
}
//已设置完循环
q1=new GridLayout(4,4);
p.setLayout(q1);
f.add(t,BorderLayout.NORTH);
f.add(p,BorderLayout.CENTER);
f.setVisible(true);
f.setSize(400,300);
}
public static void main(String args[]) {
new 计算器();
}
}
1 package 第七次实训;
2
3 import java.awt.BorderLayout;
4 import java.awt.Color;
5 import java.awt.event.ActionEvent;
6 import java.awt.event.ActionListener;
7
8 import javax.swing.*;
9
10 public class 改变窗口颜色 implements ActionListener {//创建接口
11 JFrame f;
12 JPanel p1,p2;
13 JButton b1,b2,b3;
14 public 改变窗口颜色() {
15 f=new JFrame("点击按钮改变背景颜色");
16 p1=new JPanel();
17 p2=new JPanel();
18 b1=new JButton("绿色");
19 b1.addActionListener(this);//加监听
20 b2=new JButton("蓝色");
21 b2.addActionListener(this);//加监听
22 b3=new JButton("灰色");
23 b3.addActionListener(this);//加监听
24 p2.setBackground(Color.pink);
25 p1.add(b1);
26 p1.add(b2);
27 p1.add(b3);
28 f.add(p1,BorderLayout.NORTH);
29 f.add(p2,BorderLayout.CENTER);
30 f.setSize(400,300);
31 f.setVisible(true);
32 }
33 public static void main(String args[]) {
34 new 改变窗口颜色();
35 }
36 @Override
37 public void actionPerformed(ActionEvent e) {
38 // TODO 自动生成的方法存根
39 if(e.getSource()==b1) {
40 p2.setBackground(Color.green);
41 }
42 else if(e.getSource()==b2) {
43 p2.setBackground(Color.cyan);
44 }
45 else if(e.getSource()==b3) {
46 p2.setBackground(Color.darkGray);
47 }
48 }
49
50
51
52 }
