java实验+代码(3)

import java.awt.*;

import java.awt.event.*; import javax.swing.*;

publicclass Jframtest2 implements ActionListener{ staticfinalintWIDTH = 300; staticfinalintHEIGHT = 200; public Jframtest2() {

JFrame jf = new JFrame(\信息提示\); jf.setLayout(new GridLayout(3, 1)); jf.add(new Panel()); JPanel p = newJPanel(); JPanel p2 = newJPanel();

Toolkit kit = Toolkit.getDefaultToolkit(); Dimension screenSize = kit.getScreenSize(); // 获取屏幕的高度和宽度

int width = screenSize.width; int height = screenSize.height; int x = (width - WIDTH) / 2; int y = (height - HEIGHT) / 2; jf.setLocation(x, y);// 窗口居中显

JLabel jl = new JLabel(\你点击了登录按钮！ \); JButton b1 = new JButton(\确定\);

b1.addActionListener(this);//监听按钮b1

p.setLocation(3, 1); p2.setLocation(3, 1);

p.add(jl,BorderLayout.CENTER);//将jl标签设置为中间显示 p2.add(b1);

jf.add(p); jf.add(p2);

jf.setResizable(false); jf.setVisible(true); jf.setSize(300, 200); jf.setSize(300, 200); }

publicvoid actionPerformed(ActionEvent e) { String comm = e.getActionCommand();

}

}

if( comm.equals(\确定\)) {

System.exit(0); }

当点击“取消”按钮时提示如下： import java.awt.*;

import java.awt.event.*; import javax.swing.*;

publicclass Jframtest3 implements ActionListener{ public Jframtest3(){ } }

JFrame jf = new JFrame(\信息提示\); jf.setLayout(new GridLayout(3, 1)); jf.add(new JPanel());

JLabel jl1 = new JLabel(\你点击了取消按钮!\); JButton b = new JButton(\确定\); b.addActionListener(this);

JPanel jp1 = newJPanel(); JPanel jp2 = newJPanel(); jp1.setLocation(3, 1);

jp2.setLocation(3, 1);//设置面板的位置

jp1.add(jl1,BorderLayout.CENTER);//面板jp1添加字符jl1,位置为中央 jp2.add(b);//面板jp2添加b按钮 jf.add(jp1);

jf.add(jp2);//将面板jp1,jp2添加到顶层容器jf

jf.setResizable(false); jf.setVisible(true); jf.setSize(300, 200);

jf.setLocation(300, 200);

jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

publicvoid actionPerformed(ActionEvent e) { String comm = e.getActionCommand(); }

if( comm.equals(\确定\)) {

System.exit(0); }