boxlayoutframe.java

Eclipse程序设计经典教程+源代码 学习java的朋友可以看看

package layout;

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

public class BoxLayoutFrame extends JFrame {
  JPanel contentPane;
  //声明BoxLayout布局类
  BoxLayout boxLayout;
  //创建6个按钮
  JButton[] jButtons = new JButton[6];

  public BoxLayoutFrame() {
    try {
      //窗口关闭时清空内存
      setDefaultCloseOperation(EXIT_ON_CLOSE);
      jbInit();
    }
    catch(Exception e) {
      e.printStackTrace();
    }
  }

  public static void main(String[] args) {
    BoxLayoutFrame frame = new BoxLayoutFrame();
    Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
    Dimension frameSize = frame.getSize();
    //居中对齐
    frame.setLocation((screenSize.width - frameSize.width) / 2,
        (screenSize.height - frameSize.height) / 2);
    frame.setVisible(true);
  }
  
  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(420, 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));
      //垂直居中对齐
      //jButtons[i].setAlignmentX(Component.CENTER_ALIGNMENT);
      //向面板容器加入各个按钮
      contentPane.add(jButtons[i], null);
    }
    //定义按钮的大小
    //jButtons[2].setMaximumSize(new Dimension(80, 40));
  }
}