grouplayoutexam.java

Java程序设计实用教程源代码 本书源代码按章分别放置在不同的文件夹中,所有程序均在JDK1.6环境下编译运行正常,除了第13章需要建立ODBC数据源之外,其他程序只要有Java运行环境即可直接运行

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

public class groupLayoutExam extends JFrame {
  public groupLayoutExam() {
    super("GroupLayout布局管理器");
    GroupLayout lay = new GroupLayout(this.getContentPane());
    this.getContentPane().setLayout(lay);
    lay.setAutoCreateGaps(true);
    lay.setAutoCreateContainerGaps(true);
    JLabel lab1 = new JLabel("用户名：");
    JLabel lab2 = new JLabel("密码：");
    JTextField tf1 = new JTextField(20);
    JPasswordField tf2 = new JPasswordField(20);
    GroupLayout.SequentialGroup hGrp = lay.createSequentialGroup();
    hGrp.addGroup(lay.createParallelGroup().addComponent(lab1).addComponent(lab2));
    hGrp.addGroup(lay.createParallelGroup().addComponent(tf1).addComponent(tf2));
    lay.setHorizontalGroup(hGrp);
    GroupLayout.SequentialGroup vGrp = lay.createSequentialGroup();
    vGrp.addGroup(lay.createParallelGroup(GroupLayout.Alignment.BASELINE).
                    addComponent(lab1).addComponent(tf1));
    vGrp.addGroup(lay.createParallelGroup(GroupLayout.Alignment.BASELINE).
                    addComponent(lab2).addComponent(tf2));
    lay.setVerticalGroup(vGrp);
    setSize(280, 120);
    addWindowListener(new WindowAdapter() {
      public void windowClosing(WindowEvent e) {
        System.exit(0);
      }
    });
  }
  public static void main(String args[]) {
    groupLayoutExam o = new groupLayoutExam();
    o.setVisible(true);
  }
}