layoutdemo.java

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

// 边框布局管理器---------------------------------------------------------------
class BorderLayoutDemo extends JFrame
{
  private Container pane;
  private int width,height;
  private JButton east,south,west,north,center;
  private BorderLayout layout;
  
  public BorderLayoutDemo(int w,int h)
  {
    super("边界布局示例");
    width = w;
    height = h;
    init();
  }

  private void init()
  {
    Font f = new Font("宋体",Font.BOLD,24);
    layout = new BorderLayout();  // 创建边框布局管理对象
      
    this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    pane = this.getContentPane();
    pane.setLayout(layout);       // 设置内容窗格的布局
   
    east = new JButton("东");
    east.setFont(f);
    pane.add(east,BorderLayout.EAST);
    south = new JButton("南");
    south.setFont(f);
    pane.add(south,BorderLayout.SOUTH);
    west = new JButton("西");
    west.setFont(f);
    pane.add(west,BorderLayout.WEST);
    north = new JButton("北");
    north.setFont(f);
    pane.add(north,BorderLayout.NORTH);
    center = new JButton("中");
    center.setFont(f);
    pane.add(center,BorderLayout.CENTER);
    
    this.setSize(width,height);
    this.setVisible(true);
  }
}

// 流式布局管理器---------------------------------------------------------------
class FlowLayoutDemo extends JFrame
{
  private Container pane;
  private int width,height;
  private FlowLayout layout;
  
  public FlowLayoutDemo(int w,int h)
  {
    super("流式布局示例");
    width = w;
    height = h;
    init();
  }
  private void init()
  {
    Font f = new Font("宋体",Font.BOLD,24);
    JButton b;
    layout = new FlowLayout(FlowLayout.LEFT);

    this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    pane = this.getContentPane();
    pane.setLayout(layout);

    for(int i=1;i<=10;i++)
    {
      b = new JButton(Integer.toString(i));
      b.setFont(f);
      pane.add(b);
    }
    
    this.setSize(width,height);
    this.setVisible(true);
  }
}

// 网格布局管理器---------------------------------------------------------------
class GridLayoutDemo extends JFrame
{
  private Container pane;
  private int width,height;
  private GridLayout layout;
  private int rows,cols;
  
  public GridLayoutDemo(int w,int h,int r,int c)
  {
    super("网格布局示例");
    width = w;
    height = h;
    rows = r;
    cols = c;
    init();
  }
  
  private void init()
  {
    Font f = new Font("宋体",Font.BOLD,24);
    JButton b;
    layout = new GridLayout(rows,cols);
    
    this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    pane = this.getContentPane();
    pane.setLayout(layout);

    for(int i=1;i<=21;i++)
    {
      b = new JButton(Integer.toString(i));
      b.setFont(f);
      pane.add(b);
    }
    this.setSize(width,height);
    this.setVisible(true);
  }
}

// BOX布局管理器---------------------------------------------------------------
class BoxLayoutDemo extends JFrame
{
  private Container pane;
  private int width,height;
  private BoxLayout layout;
  
  public BoxLayoutDemo(int w,int h)
  {
    super("网格布局示例");
    width = w;
    height = h;
    init();
  }
  
  private void init()
  {
    Font f = new Font("宋体",Font.BOLD,24);
    JButton b;

    this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    pane = this.getContentPane();
    layout = new BoxLayout(pane,BoxLayout.X_AXIS);
    pane.setLayout(layout);

    for(int i=1;i<=10;i++)
    {
      b = new JButton(Integer.toString(i));
      b.setFont(f);
      pane.add(b);
    }
    this.setSize(width,height);
    this.setVisible(true);
  }
}
public class LayoutDemo
{
  public static void main(String[] args)
  {
    //new BorderLayoutDemo(400,300);
    //new FlowLayoutDemo(400,300);
    //new GridLayoutDemo(400,300,5,6);
    new BoxLayoutDemo(400,300);
  }
}