Java2实用教程(第二版)程序代码——第十二章 布局设计
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//例子1
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import java.applet.*;import java.awt.*;
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public class Example12_1 extends Applet
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{ public void init()
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{ FlowLayout flow=new FlowLayout();
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flow.setAlignment(FlowLayout.LEFT);
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flow.setHgap(20);flow.setVgap(40);
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setLayout(flow);
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setBackground(Color.cyan);
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for(int i=1;i<=12;i++)
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{ add(new Button("i am "+i));
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}
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}
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}
15![](/Images/OutliningIndicators/None.gif)
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//例子2
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import java.awt.*;import java.applet.*;
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public class Example12_2 extends Applet
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{ Button button1,button2;
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Label label1,label2;
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TextArea text;
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public void init()
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{ setLayout(new BorderLayout());
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text=new TextArea(10,10);
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button1=new Button("东");
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button2=new Button("西");
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label1=new Label("上北",Label.CENTER);
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label2=new Label("下南",Label.CENTER);
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add(BorderLayout.NORTH,label1);
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add(label2,BorderLayout.SOUTH);
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add(button1,BorderLayout.EAST);
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add(BorderLayout.WEST,button2);
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add(BorderLayout.CENTER,text);
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}
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}
36![](/Images/OutliningIndicators/None.gif)
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//例子3
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import java.applet.*;import java.awt.*;import java.awt.event.*;
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class Mycanvas extends Canvas
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{ int x,y;
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Mycanvas(int a,int b)
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{ x=a;y=b;
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setSize(100,160);
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}
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public void paint(Graphics g)
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{ g.setColor(Color.red);
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g.fillOval(50,50,4*x,4*y);//画实心椭圆
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g.drawString("我是第 "+x,10,150);
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}
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}
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public class Example12_3 extends Applet implements ActionListener
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{ CardLayout mycard;
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Button button1,button2,button3;
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Mycanvas mycanvas[];
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Panel p;
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public void init()
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{ setLayout(new BorderLayout()); //小容器的布局是边界布局。
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mycard=new CardLayout();
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p=new Panel();
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p.setLayout(mycard); //p的布局设置为mycard(卡片式布局)
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button1=new Button("first");
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button2=new Button("next");
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button3=new Button("last one");
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mycanvas=new Mycanvas[21];
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for(int i=1;i<=20;i++)
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{ mycanvas[i]=new Mycanvas(i,i);
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p.add("i am"+i,mycanvas[i]);
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}
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button1.addActionListener(this);
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button2.addActionListener(this);
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button3.addActionListener(this);
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Panel p2=new Panel();
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p2.add(button1);p2.add(button2);p2.add(button3);
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add(p,BorderLayout.CENTER);add(p2,BorderLayout.SOUTH);
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}
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public void actionPerformed(ActionEvent e)
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{ if(e.getSource()==button1)
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{ mycard.first(p);
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}
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else if(e.getSource()==button2)
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{ mycard.next(p);
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}
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else if(e.getSource()==button3)
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{ mycard.last(p);
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}
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}
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}
88![](/Images/OutliningIndicators/None.gif)
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//例子4
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import java.applet.*; import java.awt.*;
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import java.awt.event.*;
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public class Example12_4 extends Applet
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{ GridLayout grid;
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public void init()
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{ grid=new GridLayout(12,12);
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setLayout(grid);
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Label label[][]=new Label[12][12];
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for(int i=0;i<12;i++)
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{ for(int j=0;j<12;j++)
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{ label[i][j]=new Label();
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if((i+j)%2==0)
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label[i][j].setBackground(Color.black);
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else
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label[i][j].setBackground(Color.white);
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add(label[i][j]);
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}
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}
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}
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}
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//例子5
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import javax.swing.*;import java.awt.*;import java.awt.event.*;
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import javax.swing.border.*;
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public class Example12_5 extends java.applet.Applet
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{ Box baseBox ,boxH,boxV;
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public void init()
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{ baseBox=Box.createHorizontalBox();
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boxH=Box.createHorizontalBox();
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boxV=Box.createVerticalBox();
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for(int i=1;i<=5;i++)
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{ boxH.add(new JButton("按钮 "+i));
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boxV.add(new JButton("按钮 "+i));
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}
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baseBox.add(boxH);baseBox.add(boxV);
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add(baseBox);
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}
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}
128![](/Images/OutliningIndicators/None.gif)
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//例子6
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import javax.swing.*; import java.awt.*;
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import javax.swing.border.*;
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public class Example12_6 extends java.applet.Applet
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{ Box baseBox ,boxV1,boxV2;
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public void init()
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{ boxV1=Box.createVerticalBox();
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boxV1.add(new Label("输入您的姓名"));
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boxV1.add(Box.createVerticalStrut(8));
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boxV1.add(new Label("输入email"));
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boxV1.add(Box.createVerticalStrut(8));
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boxV1.add(new Label("输入您的职业"));
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boxV2=Box.createVerticalBox();
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boxV2.add(new TextField(16));
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boxV2.add(Box.createVerticalStrut(8));
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boxV2.add(new TextField(16));
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boxV2.add(Box.createVerticalStrut(8));
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boxV2.add(new TextField(16));
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baseBox=Box.createHorizontalBox();
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baseBox.add(boxV1);
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baseBox.add(Box.createHorizontalStrut(10));
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aseBox.add(boxV2);
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add(baseBox);
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}
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}
154![](/Images/OutliningIndicators/None.gif)
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//例子7
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import javax.swing.*;import java.awt.*;
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import javax.swing.border.*;
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public class Example12_7 extends java.applet.Applet
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{ Box baseBox ,boxV1,boxV2,boxV3;
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public void init()
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{ boxV1=Box.createVerticalBox();
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for(int i=1;i<=3;i++)
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{ boxV1.add(new JButton("按钮"+i));
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}
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boxV1.add(Box.createVerticalGlue());
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boxV2=Box.createVerticalBox();
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boxV2.add(Box.createVerticalGlue());
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for(int i=1;i<=8;i++)
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{ boxV2.add(new JButton("按钮"+i));
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}
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boxV3=Box.createVerticalBox();
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for(int i=1;i<=6;i++)
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{ boxV3.add(new JButton("按钮"+i));
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if(i==3)
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boxV3.add(Box.createVerticalGlue());
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}
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baseBox=Box.createHorizontalBox();
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baseBox.add(boxV1);baseBox.add(boxV2);
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baseBox.add(boxV3); add(baseBox);
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}
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}
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