Java程序设计教案(第五章)

1、Java程序设计教案(第五章)教案纸 第5章 Java的图形用户界面（6学时）【主要讲授内容及时间分配】5.1 图形用户界面概述（25分钟）5.2 AWT中常用类的层次结构（20分钟）5.3 基本组件的使用（45分钟）5.4 布局管理器（45分钟）5.5 事件处理 （90分钟）5.6 菜单、绘图类的使用（45分钟）【重点与难点】1、重点：（1）基本组件的使用，包括Label、Button、TextField、TextArea、List、Checkbox和CheckboxGroup的构造方法和常用方法的使用。（2）布局管理器的使用，包括FlowLayout、GridLayout、BorderLa

2、yout。（3）事件处理。2、难点：事件处理。【教学要求】1、可以构造出图形用户界面；2、可以为界面上的组件编写相应的事件处理代码；3、可以构造带有菜单的应用程序；4、可以写小游戏。【实施方法】课堂讲授，PPT配合5.3 基本组件的使用1 Label类import java.awt.*;public class LabelDemo extends Framepublic LabelDemo()Label lb1,lb2,lb3;lb1=new Label(LeftLabel);lb2=new Label(CenterLabel,Label.CENTER);lb3=new Label(Right

3、Label,Label.RIGHT);lb3.setText(改变我的名字);lb3.setAlignment(Label.CENTER);/lb3.setVisible(false);setLayout(new FlowLayout();add(lb1);add(lb2);add(lb3); public static void main(String args) LabelDemo Ld=new LabelDemo(); Ld.setVisible(true); Ld.pack(); 2 Button类import java.awt.*;public class MyButtons pub

4、lic static void main(String args) Frame f = new Frame(); f.setLayout(new FlowLayout(); Button button1 = new Button(Ok); Button button2 = new Button(Open); Button button3 = new Button(Close); f.add(button1); f.add(button2); f.add(button3); f.setSize(300,100); f.setVisible(true); 3 CheckBox 类import ja

5、va.awt.*;public class CheckboxDemo2 extends Frame public CheckboxDemo2() setLayout(new FlowLayout(); String University=Tsinghua,Pecking,Fudan,Nanki,Tianjin; Checkbox c=new Checkbox5; Label label=new Label(There are 5 University!); Label label2=new Label(There are 5 University!); Label label3=new Lab

6、el(There are 5 University!); add(new Label(Please choice the University:);for(int i=0;i5;i+)ci=new Checkbox(Universityi);add(ci);add(label);add(label2);add(label3);this.pack(); show();public static void main(String args)CheckboxDemo2 cbd=new CheckboxDemo2();cbd.setSize(400,500);4 CheckBoxGroup类impor

7、t java.awt.*;import java.awt.CheckboxGroup;public class CheckboxGroupDemo2 extends Frame public CheckboxGroupDemo2() super(CheckboxGroupDemo2); setLayout(new FlowLayout(); String University=Tsinghua,Pecking,Fudan,Nanki,Tianjin; Checkbox c=new Checkbox5; Label label=new Label(There are 5 University!)

8、;CheckboxGroup d=new CheckboxGroup();add(new Label(Please choice the University:);for(int i=0;i=0) handleDel(list.getSelectedIndex(); else if(e.getSource()=up)&(list.getSelectedIndex()0) handleIncPriority(list.getSelectedIndex(); else if(e.getSource()=down)&(list.getSelectedIndex()=0) handleDecPrior

9、ity(list.getSelectedIndex(); else if(e.getSource()=list) taskInput.setText(list.getSelectedItem(); taskInput.requestFocus(); private void handleAdd(String newTask) list.add(newTask); list.select(list.getItemCount()-1); taskInput.setText(); private void handleDel(int pos) list.remove(pos); list.selec

10、t(pos); private void handleIncPriority(int pos) String item=list.getItem(pos); list.remove(pos); list.add(item,pos-1); list.select(pos-1); private void handleDecPriority(int pos) if(poscage.getSize().width) x=cage.getSize().width; xdir*=(-1); if(xcage.getSize().height) y=cage.getSize().height; ydir*

11、=(-1); if(y0) ydir*=-1; public void draw(Graphics g) g.drawImage(bird,x,y,30,30,cage); Cage类import java.awt.*;import java.awt.event.*;public class Cage extends Frame implements ActionListener private Button quit=new Button(Quit); private Button start=new Button(Start); private Button stop=new Button

12、(Stop); private Bird birds=new Bird20; Image bird=Toolkit.getDefaultToolkit().getImage(qq.jpg); public Cage() super(Cage with Birds); setLayout(new FlowLayout(); add(quit); quit.addActionListener(this); add(start); start.addActionListener(this); add(stop); stop.addActionListener(this); setSize(400,5

13、00); this.setVisible(true); for(int i=0;ibirds.length;i+) int x=(int)(getSize().width*Math.random(); int y=(int)(getSize().height*Math.random(); birdsi=new Bird(this,x,y); public void actionPerformed(ActionEvent e) if(e.getSource()=stop) for(int i=0;ibirds.length;i+) birdsi.halt(); if(e.getSource()=

14、start) for(int i=0;ibirds.length;i+) birdsi.halt(); birdsi=new Bird(this,birdsi.x,birdsi.y); if(e.getSource()=quit) System.exit(0); public void paint(Graphics g) for(int i=0;ibirds.length;i+) if(birdsi!=null) birdsi.draw(g); public static void main(String args) Cage table=new Cage(); DrawWithCanvasi

15、mport java.applet.*;import java.awt.*;public class DrawWithCanvas extends Frame private Button draw=new Button(Draw); private DrawCanvas canvas =new DrawCanvas(); public DrawWithCanvas() Panel panel=new Panel(); panel.setLayout(new FlowLayout(); panel.add(draw); setLayout(new BorderLayout(); add(Nor

16、th,panel); add(South,canvas); this.setSize(400,500); pack(); show(); public static void main(String args) DrawWithCanvas dnc=new DrawWithCanvas(); class DrawCanvas extends Canvas public DrawCanvas()this.setSize(400,500); public void paint(Graphics g) for(int i=12;igetSize().height;i+=12) g.drawString(y location is:+i,10,i); DrawNoCanvasimport java.applet.*;import java.awt.*;public class DrawNoCanvas extends Frame private Button draw=new Button(Draw); public DrawNoCanvas() Panel panel=new Panel(); panel.setLayout(new FlowLay