boxlayoutframe.java~39~

jbuilder2006一书的所有源代码

package layout;

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

public class BoxLayoutFrame extends JFrame {
  JPanel contentPane;
  //声明BoxLayout布局类
  BoxLayout boxLayout;
  //创建9个按钮
  JButton[] jButtons = new JButton[9];

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

  private void jbInit() throws Exception  {
    //取得窗口面板
    contentPane = (JPanel)this.getContentPane();
    //创建BoxLayout布局，contentPane表示窗口面板，BoxLayout.X_AXIS表示沿x轴排列
    boxLayout = new BoxLayout(contentPane, BoxLayout.X_AXIS);
    //为面板容器定义BoxLayout布局
    contentPane.setLayout(boxLayout);
    this.setSize(new Dimension(400, 300));
    this.setTitle("BoxLayout示例");
    for (int i = 0; i < jButtons.length; i++) {
      //创建按钮
      jButtons[i] = new JButton();
      //设置按钮的属性
      jButtons[i].setText("按钮" + (i + 1));
      //向面板容器加入各个按钮
      contentPane.add(jButtons[i], null);
    }
  }

  //关闭窗口时清空内存
  protected void processWindowEvent(WindowEvent e) {
    if (e.getID() == WindowEvent.WINDOW_CLOSING) {
      System.exit(0);
    }
  }
}