borderlayoutframe.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 BorderLayoutFrame extends JFrame {
  JPanel contentPane;
  //创建BorderLayout布局
  BorderLayout borderLayout1 = new BorderLayout();
  //创建5个按钮
  JButton jButton1 = new JButton();
  JButton jButton2 = new JButton();
  JButton jButton3 = new JButton();
  JButton jButton4 = new JButton();
  JButton jButton5 = new JButton();

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

  public static void main(String[] args) {
    BorderLayoutFrame frame = new BorderLayoutFrame();
    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 initialize() throws Exception  {
    contentPane = (JPanel) this.getContentPane();
    contentPane.setLayout(borderLayout1);
    this.setSize(new Dimension(400, 300));
    this.setTitle("BorderLayout示例");
    //设置按钮的文字属性
    jButton1.setText("北");
    jButton2.setText("中");
    jButton3.setText("西");
    jButton4.setText("东");
    jButton5.setText("南");
    //为面板加入5个按钮,BorderLayout.NORTH表示在北面显示按钮
    contentPane.add(jButton1, BorderLayout.NORTH);
    contentPane.add(jButton2, BorderLayout.CENTER);
    contentPane.add(jButton3, BorderLayout.WEST);
    contentPane.add(jButton4, BorderLayout.EAST);
    contentPane.add(jButton5, BorderLayout.SOUTH);
  }
}