nulllayoutframe.java~11~

jbuilder2006一书的所有源代码

package layout;

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

public class NullLayoutFrame extends JFrame {
  JPanel contentPane;
  //创建3个按钮
  JButton jButton1 = new JButton();
  JButton jButton2 = new JButton();
  JButton jButton3 = new JButton();

  public NullLayoutFrame() {
    try {
      jbInit();
    }
    catch(Exception e) {
      e.printStackTrace();
    }
  }

  private void jbInit() throws Exception  {
    contentPane = (JPanel) this.getContentPane();
    //将布局设为null
    contentPane.setLayout(null);
    this.setSize(new Dimension(400, 300));
    this.setTitle("NullLayout示例");
    jButton1.setText("jButton1");
    jButton2.setText("jButton2");
    jButton3.setText("jButton3");
    //设置按钮的位置和大小
    jButton1.setBounds(new Rectangle(38, 25, 77, 157));
    jButton2.setBounds(new Rectangle(130, 28, 251, 52));
    jButton3.setBounds(new Rectangle(129, 87, 252, 97));
    //为窗口面板加入按钮
    contentPane.add(jButton1, null);
    contentPane.add(jButton2, null);
    contentPane.add(jButton3, null);
  }

  protected void processWindowEvent(WindowEvent e) {
    if (e.getID() == WindowEvent.WINDOW_CLOSING) {
      System.exit(0);
    }
  }
}