java图形界面之布局设计 java图形界面之布局设计

 import javax.swing.*;import java.awt.*;
 public class J505{
   public static void main(String[]args){
     JLabel label1,label2,label3,label4,label5;
     JFrame mw=new JFrame("我是一个窗口");//创建一个窗口容器对象
     mw.setSize(250,200);
     Container con=mw.getContentPane();
     con.setLayout(new BorderLayout());
     label1=new JLabel("东标签");//默认左对齐
     label2=new JLabel("南标签",JLabel.CENTER);
     label3=new JLabel("西标签");
     label4=new JLabel("北标签",JLabel.CENTER);
     label5=new JLabel("中标签",JLabel.CENTER);
     con.add(label1,"East");
     con.add(label2,"South");
     con.add(label3,"West");
     con.add(label4,"North");
     con.add(label5,"Center");
     mw.setVisible(true);
   }
 }

import java.applet.*;
import javax.swing.*;
import java.awt.*;
class MyWindow extends JFrame{
  public MyWindow(int w,int h){
    setTitle("滚动面板实例");
    Container con=getContentPane();
    con.setPreferredSize(new Dimension(w,h));
    con.setLayout(new BorderLayout());
    JPanel p=new JPanel();
    p.setLayout(new GridLayout(6,6));
    for (int i=0;i<6;i++){
      p.add(new JLabel());
      for(int j=1;j<=2;j++){
        p.add(new JButton("按钮"+(2*i+j)));
        p.add(new JLabel("标签"+(2*i+j)));
      }
      p.add(new JLabel());
    }
    p.setBackground(Color.blue);
    p.setPreferredSize(new Dimension(w+60,h+60));
    JScrollPane ScrollPane=new JScrollPane(p);
    ScrollPane.setPreferredSize(new Dimension(w-60,h-60));
    add(ScrollPane,BorderLayout.CENTER);//小程序添加滚动面板
    setVisible(true); pack();
  }
}
class ScrollPane extends JScrollPane{
  public ScrollPane(Component p){
    super(p);
    setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
    setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
  }
}
public class J506 extends Applet{
  MyWindow myWindow;
  public void init(){
    myWindow=new MyWindow(400,350);
  }
}

  CardLayout myCard = new CardLayout();//创建CardLayout布局对象
  JPanel p = new JPanel();//创建Panel对象
  p.setLayout(myCard);

import java.applet.*;import java.awt.*;
import java.awt.event.*;import javax.swing.*;
class MyPanel extends JPanel{
  int x;JLabel label1;
  MyPanel(int a){
    x=a;getSize();
    label1=new JLabel("我是第"+x+"个标签");add(label1);
  }
  public Dimension getPreferredSize(){
    return new Dimension(200,50);
  }
}
public class J507 extends Applet implements ActionListener{
  CardLayout mycard;MyPanel myPanel[];JPanel p;
  private void addButton(JPanel pan,String butName,ActionListener listener){
    JButton aButton=new JButton(butName);
    aButton.addActionListener(listener);
    pan.add(aButton);
  }
  public void init(){
    setLayout(new BorderLayout());//小程序的布局是边界布局
    mycard=new CardLayout();
    this.setSize(400,150);
    p=new JPanel();p.setLayout(mycard);//p的布局设置为卡片式布局
    myPanel=new MyPanel[10];
    for(int i=0;i<10;i++){
      myPanel[i]=new MyPanel(i+1);
      p.add("A"+i,myPanel[i]);
    }
    JPanel p2=new JPanel();
    addButton(p2,"第一个",this);
    addButton(p2,"最后一个",this);
    addButton(p2,"前一个",this);
    addButton(p2,"后一个",this);
    add(p,"Center"); add(p2,"South");
  }
  public void actionPerformed(ActionEvent e){
    if (e.getActionCommand().equals("第一个"))mycard.first(p);
    else if(e.getActionCommand().equals("最后一个"))mycard.last(p);
    else if(e.getActionCommand().equals("前一个"))mycard.previous(p);
    else if(e.getActionCommand().equals("后一个"))mycard.next(p);
  }
}