|
1.先说说Swing中的不一般的组件
JFrame,JDialog,JWindow,JApplet这四个组件是重量级组件，因为要在操作系统中显示窗口画面，必须使用操作系统的窗口资源,所以JFrame 是继承自AWT里面的Frame的，有本地C代码.
JFrame,JDialog,JWindow,JApplet这四个组件是最上层组件，其余的Swing组件都必须依附在这四个组件之上才能显示出来.这四个组件实现了RootPaneContainer接口,RootPaneContainer接口定义了各种容器取得与设置的方法，这里的各种容器指的是JRootPane(虚拟的容器),GlassPane,ContentPane,我们要在最上层组件上加入任何组件只能在GlassPane和ContentPane上面增加,也就是在Layered Pane上面或者在Layered Pane的ContentPane上面增加.
2.RootPaneContainer接口的定义
查看Java的doc,可以知道的(有问题第一反映应该是看JDK的文档，要学会学习)
通过查看文档我们可以发现:
(1).共有五个类实现了RootPaneContainer接口,他们是:JFrame,JApplet,JWindow,JDialog,JInternalFrame.值得注意的是其中的JInternalFrame是轻量级组件,
不能单独显示的
(2).RootPanelContainer有如下的几种方法
Container getContentPane();
Component getGlassPane();
JLayeredPane getLayeredPane();
JRootPane getRootPane();
void setContentPane(
Container
contentPane);
void setGlassPane(
Component
glassPane);
void setLayeredPane(
JLayeredPane
layeredPane);
3.JRootPane的介绍
请大家自己查看JDK的文档，不要偷懒.
我就大概谈一下:
JRootPane是由Glass Pane与LayeredPane组成的，是虚拟的容器，不能在上面加任何组件.
有好同志会问不能加任何组件那用来干嘛的？？
因为它是用来让最上层组件能加入别的组件的。几个最上层组件里面都有JRootPane组件。
4.Layered Pane是什么东东??
很多写过Swing程序的新手都没有接触到Layered Pane，和他们接触最多的就是Content Pane了，那么Layered Pane是什么东东呢??Layered Pane就像家中放鞋子的鞋架，有很多层，而ContetPane则是其中的一层，一般我们只要对这一层进行操作就行了！！
5.Layout Manager的版面管理器
(1).BorderLayout
使用可以去看JDK文档，
package MyJava.Base;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class FrameBorderLayout extends JFrame
{
private JPanel jPanel;
private BorderLayout bl;
private JButton button1=new JButton("Center");
private JButton button2=new JButton("East");
private JButton button3=new JButton("West");
private JButton button4=new JButton("South");
private JButton button5=new JButton("North");
FrameBorderLayout()
{
super("This is an example of FrameBorderLayout");
setSize(400,300);
bl=new BorderLayout();
jPanel=new JPanel();
jPanel.setLayout(bl);
jPanel.add(button1,BorderLayout.CENTER);
jPanel.add(button2,BorderLayout.EAST);
jPanel.add(button3,BorderLayout.WEST);
jPanel.add(button4,BorderLayout.SOUTH);
jPanel.add(button5,BorderLayout.NORTH);
this.setContentPane(jPanel);
}
public static void main(String[] args)
{
FrameBorderLayout fr=new FrameBorderLayout();
fr.show();
fr.addWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent e)
{
System.exit(0);
}
}
);
}
}
程序运行的结果:
(2).FlowLayout
package MyJava.Base;
import javax.swing.*;
import java.awt.FlowLayout;
import java.awt.event.*;
public class FrameFlowLayout extends JFrame
{
private JButton JButton1=new JButton("Flow1");
private JButton JButton2=new JButton("Flow2");
private JButton JButton3=new JButton("Flow3");
private JButton JButton4=new JButton("Flow4");
private JButton JButton5=new JButton("Flow5");
public FrameFlowLayout()
{
super("This is an example of FrameFlowLayout");
setSize(400,300);
FlowLayout f1=new FlowLayout(FlowLayout.TRAILING,10,10);
JPanel jpanel1=new JPanel();
jpanel1.setLayout(f1);
jpanel1.add(JButton1);
jpanel1.add(JButton2);
jpanel1.add(JButton3);
jpanel1.add(JButton4);
jpanel1.add(JButton5);
this.setContentPane(jpanel1);
}
public static void main(String args[]){
FrameFlowLayout ff1=new FrameFlowLayout();
ff1.show();
ff1.addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e){
System.exit(0);
}
});
}
}
运行结果:
(3).GridLayout
package MyJava.Base;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class FrameGridLayout extends JFrame
{
private JPanel jpanel1;
private GridLayout g1;
private JButton JButton1=new JButton("Flow1");
private JButton JButton2=new JButton("Flow2");
private JButton JButton3=new JButton("Flow3");
private JButton JButton4=new JButton("Flow4");
private JButton JButton5=new JButton("Flow5");
private JButton JButton6=new JButton("Flow6");
public FrameGridLayout()
{
super("FrameGridLayout");
setSize(300,120);
g1=new GridLayout(2,3,10,10);
jpanel1=new JPanel();
jpanel1.setLayout(g1);
jpanel1.add(JButton1);
jpanel1.add(JButton2);
jpanel1.add(JButton3);
jpanel1.add(JButton4);
jpanel1.add(JButton5);
jpanel1.add(JButton6);
this.setContentPane(jpanel1);
}
public static void main(String args[])
{
FrameGridLayout fg1=new FrameGridLayout();
fg1.show();
fg1.addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e){
System.exit(0);
}
});
}
}
(4).GridBagLayout
package MyJava.Base;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class FrameGridBagLayout extends JFrame
{
private JPanel jpanel1=new JPanel();
private GridLayout g1;
private JButton JButton1=new JButton("First");
private JButton JButton2=new JButton("Second");
private JButton JButton3=new JButton("Third");
private JButton JButton4=new JButton("Fourth");
private JButton JButton5=new JButton("Fifth");
private JButton JButton6=new JButton("Sixth");
private JButton JButton7=new JButton("Seventh");
public FrameGridBagLayout()
{
super("FrameGridBagLayout");
setSize(300,150);
GridBagLayout gb1=new GridBagLayout();
jpanel1.setLayout(gb1);
GridBagConstraints gbc=new GridBagConstraints();
gbc.fill=GridBagConstraints.BOTH;
gbc.gridwidth=1;
gbc.gridheight=1;
gbc.gridx=0;
gbc.gridy=0;
jpanel1.add(JButton1,gbc);
gbc.gridx=1;
jpanel1.add(JButton2,gbc);
gbc.gridx=2;
jpanel1.add(JButton3,gbc);
gbc.gridx=0;
gbc.gridy=1;
gbc.gridwidth=3;
jpanel1.add(JButton4,gbc);
gbc.gridy=2;
gbc.gridwidth=1;
jpanel1.add(JButton5,gbc);
gbc.gridx=1;
gbc.gridwidth=2;
gbc.gridheight=2;
jpanel1.add(JButton6,gbc);
gbc.gridx=0;
gbc.gridy=3;
gbc.gridwidth=1;
gbc.gridheight=1;
jpanel1.add(JButton7,gbc);
this.setContentPane(jpanel1);
}
public static void main(String args[]){
FrameGridBagLayout fg1=new FrameGridBagLayout();
fg1.show();
fg1.addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e){
System.exit(0);
}
});
}
}
(5).CardLayout
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class FrameCardLayout extends JFrame{
private JPanel jpanel1;
private CardLayout c1;
private JButton jButton1=new JButton("Layer1");
private JButton jButton2=new JButton("Layer2");
private JButton jButton3=new JButton("Layer3");
public FrameCardLayout(){
super("frameCardlayout");
setSize(300,120);
jpanel1=new JPanel();
c1=new CardLayout();
jpanel1.setLayout(c1);
jpanel1.add(jButton1,"First Layer");
jpanel1.add(jButton2,"Second Layer");
jpanel1.add(jButton3,"Third Layer");
c1.show(jpanel1,"Second Layer");
this.setContentPane(jpanel1);
}
public static void main(String arg[]){
FrameCardLayout fg1=new FrameCardLayout();
fg1.show();
fg1.addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e){
System.exit(0);
}
});
}
}
(6).BoxLayout
这个程序以后补上
6.如果觉得版面管理器学不了可以不使用，直接指定组件的绝对位置和大小
package MyJava.Base;
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
class NonLayoutPane extends JPanel
{
public NonLayoutPane()
{
this.setLayout(null);
JButton b1=new JButton("one");
b1.setBounds(15,10,80,30);
add(b1);
JButton b2=new JButton("two");
b1.setBounds(80,50,90,40);
add(b2);
}
}
class NonLayoutFrame extends JFrame
{
public NonLayoutFrame()
{
this.setTitle("NonLayoutTest");
setSize(200,130);
this.getContentPane().add(new NonLayoutPane());
this.addWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent evt)
{
System.exit(0);
}
}
);
}
}
public class NonLayoutTest
{
public static void main(String[] args)
{
NonLayoutFrame frame=new NonLayoutFrame();
frame.setVisible(true);
}
}
|
