import java.awt.FlowLayout;import java.awt.GridLayout;import java.awt.BorderLayout;import java.awt.Color;import java.awt.Dimension;import javax.swing.ImageIcon;import javax.swing.Box;import javax.swing.SwingConstants;import javax.swing.BoxLayout;import javax.swing.JFrame;import javax.swing.JLabel;import javax.swing.JPanel;import javax.swing.JTabbedPane;import javax.swing.JButton;import java.awt.event.*; public class LayoutDemo{ public static void main(String[] args) {  JFrame frame = new JFrame ("Layout Manager Demo");  frame.setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE);    JTabbedPane tp = new JTabbedPane();  tp.addTab ("Flow",new FlowPanel());  tp.addTab ("Border",new BorderPanel());  tp.addTab ("Grid",new GridPanel());  tp.addTab ("Box",new BoxPanel());    frame.setContentPane(tp);  frame.pack();  frame.show(); }} //定义流式布局管理器class FlowPanel extends JPanel{ public FlowPanel () {  /*  构造方法：  1: FlowLayout ()  2: FlowLayout (int align)  3: FlowLayout (int align, int hgap, int vgap)  参数说明:  align 表示一行的对齐方式.有左对齐FlowLayout.LEFT,居中对齐FlowLayout.CENTER,右对齐FlowLayout.RIGHT  hgap:组件的水平间隙,vgap:组件的垂直间隙  */  FlowLayout layout = new FlowLayout (FlowLayout.LEFT, 10,50);  layout.layoutContainer (this);//参数指明应用的对象容器.同于:setLayout (layout);  layout.setAlignment (FlowLayout.CENTER);  layout.setHgap (50);  layout.setVgap (20);    setBackground (Color.green);    JButton b1 = new JButton ("BUTTON 1");  JButton b2 = new JButton ("BUTTON 2");  JButton b3 = new JButton ("BUTTON 3");  JButton b4 = new JButton ("BUTTON 4");  JButton b5 = new JButton ("BUTTON 5");    add (b1);  add (b2);  add (b3);  add (b4);  add (b5); }}         //定义边界布局管理器 class BorderPanel extends JPanel{ private ImageIcon icon = new ImageIcon("Image//layoutDemodriveWay.gif"); JButton west = new JButton ("西"); JButton north = new JButton ("北"); JButton south = new JButton ("南"); JButton east = new JButton ("东"); JLabel center = new JLabel ("", icon,SwingConstants.CENTER);  public BorderPanel() {  setLayout (new BorderLayout());    setBackground (Color.black);  west.addActionListener (new Button1Listener());  north.addActionListener (new Button2Listener());  south.addActionListener (new Button3Listener());  east.addActionListener (new Button4Listener());      /*将组件添加到边界布局的容器中需要指明位置如果不指明则  默认为BorderLayout.CENTER,可以覆盖*/    add (west,BorderLayout.WEST);  add (north,BorderLayout.NORTH);  add (south,BorderLayout.SOUTH);  add (east,BorderLayout.EAST);  add (center,BorderLayout.CENTER);   }  private class Button1Listener implements ActionListener {  public void actionPerformed (ActionEvent event)  {   center.setIcon (new ImageIcon("Image//layoutDemoarrowLeft.gif"));   repaint();  } }  private class Button2Listener implements ActionListener {  public void actionPerformed (ActionEvent event)  {   center.setIcon(new ImageIcon("Image//layoutDemoarrowUp.gif"));   repaint();  } }  private class Button3Listener implements ActionListener {  public void actionPerformed (ActionEvent event)  {   center.setIcon(new ImageIcon("Image//layoutDemoarrowDown.gif"));   repaint();  } }  private class Button4Listener implements ActionListener {  public void actionPerformed (ActionEvent event)  {   center.setIcon(new ImageIcon("Image//layoutDemoarrowRight.gif"));   repaint();  } }}   //定义盒式布局管理器class BoxPanel extends JPanel{ public BoxPanel() {  /*  就一个构造函数  BoxLayout (Container target, int axis)  参数说明:  target指明要设置次布局方式的容器  axis设置布局方式,有如下选择:  BoxLayout.X_AXIS从左到右  BoxLayout.Y_AXIS从上到下  BoxLayout.LINE_AXIS  BoxLayout.PAGE_AXIS      */  setLayout (new BoxLayout (this, BoxLayout.X_AXIS));    setBackground (Color.green);    JButton b1 = new JButton ("BUTTON 1");  JButton b2 = new JButton ("BUTTON 2");  JButton b3 = new JButton ("BUTTON 3");  JButton b4 = new JButton ("BUTTON 4");  JButton b5 = new JButton ("BUTTON 5");  /*  盒式布局管理器的组件间没有间距,可以添加不可见组件到容器中去以便占用空间  Box类包含静态方法可创建不可见组件,他是在包java.swing中  Box类定义两种组件:固定大小的和可以伸缩的  Box的一些静态方法:  createGlue()//伸缩的,可水平伸缩也可垂直伸缩  createRigidArea(Dimension d)//固定水平垂直大小  createHorizontalGlue()//水平伸缩  createHorizontalStrut(int width)//固定水平大小  createVerticalGlue()//垂直伸缩  createVerticalStrut(int height)//固定垂直大小    */  add (Box.createHorizontalGlue());  add (b1);  add (Box.createRigidArea (new Dimension (10,0)));  add (b2);  add (b3);  add (Box.createHorizontalStrut (50));  add (b4);  add (Box.createHorizontalGlue());  add (b5); }}  //定义网格布局管理器class GridPanel extends JPanel{ public GridPanel() {  /*  构造函数:  GridLayout()//单行多列  GridLayout(int rows, int cols)  GridLayout(int rows, int cols, int hgap, int vgap)//行列加水平垂直间隔          */    GridLayout layout = new GridLayout (2,3);  layout.setRows (3);//当构造函数中已设置了行时此方法无效  layout.setColumns (4);//当构造函数中已设置了列时此方法无效  layout.setHgap (5);  layout.setVgap (5);  setLayout (layout);  setBackground (Color.white);    JButton b1 = new JButton ("BUTTON 1");  JButton b2 = new JButton ("BUTTON 2");  JButton b3 = new JButton ("BUTTON 3");  JButton b4 = new JButton ("BUTTON 4");  JButton b5 = new JButton ("BUTTON 5");  JButton b6 = new JButton ("BUTTON 6");      add (b1);  add (b2);  add (b3);  add (b4);  add (b5);  add (b6); }}

评论