A.pnm
B.emlim
C.performance
D.alarms
第1题
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.*;
public class java2
{
public static void main(String[]args)
{
MouseFrame. frame=new MouseFrame();
frame.setDefaultCloseoperation(JFrame.EXIT_
0N CLOSE);
frame.show();
}
}
class MouseFrame. extends JFrame
{
public MouseFrame()
{
setTitle("java2");
setSize(WIDTH,HEIGHT);
MousePanel panel=new MousePanel();
Container contentPane=getContentPane();
contentPane.add(panel);
}
public static final int WIDTH = 300;
public static final int HEIGHT=200;
}
class MousePanel extends JPanel
{
public MousePanel()
{
addMouseListener(new MouseHandler());
addMouseMotionListener(new MouseMotionHan-
dler());
}
public void paintComponent(Graphics g)
(
super.paintComponent(g);
String text="鼠标指针位置:"+mousex+":"
+mousey;
g.drawString(text,10,10);
}
private int mousex,mousey;
private class MouseMotionHandler {
public void mouseMoved(MouseEvent event)
{
mousex=event.getX();
mousey=event.getY();
repaint();
}
public void mouseDragged(MouseEvent event)
{
mousex=event.getX();
mousey=event.getY();
repaint();
}
}
private class MouseHandler
{
public void mousePressed(MouseEvent eveat)
{mousex=event.getX();
mousey=event.getY();
}
}
}
第2题
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
class ComboBoxFrame. extends JFrame. {
public ComboBoxFrame(){
setTitle("java2");
setSize(300,200);
addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e){
System.exit(0);
}
});
style=new JComboBox():
style.setEditable(true);
style.addhem("Serif");
style.addItem("SansSerif");
style.addhem("Monospaced");
style.addhem("Dialog");
style.addhem("Dialoglnput");
style.addActionListener(this);
JPanel p=new JPanel();
P.add(style);
getContentPane().add(p,"South");
panel=new ComboBoxTestPanel();
getContentPane().add(panel,"Center");
}
public void actionPerformed(ActionEvent evt){
JComboBox source=(JComboBox) ;
String item=(String)source.getSelectedhem():
panel.setStyle(item);
}
private ComboBoxTestPanel panel;
private JComboBox style;
}
class ComboBoxTestPanel extends JPanel{
public ComboBoxTestPanel(){
setStyle("Serif");
}
public void setStyle(String s){
setFont(new Font(S,Font.PLAIN,12));
repaint();
}
public void paintComponent(Graphics g){
super.paintComponent(g);
9.drawString("Welcome to China!",0,50);
}
}
public class java2{
public static void main(String[]args){
JFrame. frame=new ComboBoxFrame();
frame.show();
}
}
第3题
第5题
第6题
import java.awt.*;
import java.awt.event.*;
import javax.swing.JOptionPane;
public class java3
{
public static void main(String args[])
{
final Frame. frmFrame=new Frame();
Panel pnlPanell=new Panel();
Panel pnlPanel2=new Panel();
final List lstList=new List(8):
for(int i=0;i<;10;i++)
{
String strName="表项"+(new Integer(i+
1)).toString():
lstList.add(strName);
}
Button btnButtonl=new Button("添加");
Button btnButton2=new Button("删除");
Button btnButton3=new Button("关闭");
btnButtonl.addActionListener(new AetionListen-
er()
{
public void actionPerformed(ActionEvent e)
{
lstList.add("新增表项",lstList.getSelected()+
1);
System.out.println("列表中的表项数量:"+
lstList.getItemCount());
}
});
btnButton2.addActionListener(new ActionListen-
er()
{
public void aetionPerformed(ActionEvent e)
{
if(lstList.getSelected()= =null)
{
JOptionPane.showMessageDialog(frmFrame,"请
选择表项");
return;
}
System.out.println("删除表项的内容:"+
IstList.getSelectedItem());
lstList.delete(lstList,getSelectedIndex());
System.out.println("列表中的表项数量:"+
lstList.getltemCount()):
}
});
btnButton3.addActionListener(new ActionListen-
er()
{
public void actionPerformed(ActionEvent e)
{
System.exit(O);
}
});
pnlPanell.add(lstList);
pnlPanel2.add(btnButtonl);
pnlPanel2.add(btnButton2);
pnlPanel2.add(btnButton3);
frmFrame.add("North",pnlPanell);
frmFrame.add("South",pnlPanel2);
frmFrame.setTitle("java3");
frmFrame.pack();
frmFrame.show();
}
}
第7题
import java.awt.*;
import java.awt.event*+;
import java.awt.geom.*;
import java.util.*;
import javax.swing.*;
public class java3
{
public static void main(String[]args)
{
JFrame. frame=new AreaTestFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_
ON_CLOSE);
frame.show();
}
}
class AreaTestFrame. extends JFrame
{
public AreaTestFrame()
{
setTitle("java3");
setSize(WIDTH,HEIGHT);
areal
=new Area(new Ellipse2D.Double(100,100,
150,100));
area2
=new Area(new Rectangle2D.Double(150,150,
150,100));
Container confentPane=getContentpane();
panel=new
JPanel()
{
public void paintComponent(Graphics g)
{
super.paintComponent(g);
Graphics2D g2=(Graphics2D)g;
g2.draw(areal);
g2.draw(area2);
if(area!=null)g2.fill(area);
}
};
contentPane. add(panel,BorderLayout. CEN-
TER);
JPanel buttonPanel=new JPanel();
ButtonGroup group=new ButtonGroup();
JRadioButton addButton=new JRadioButton("
并",false);
buttonPanel.add(addButton);
group.add(addButton);
addButton.addActionListener(new
ActionListener()
{
public void actionPerformed(ActionEvent event)
{
area=new Area();
area.add(areal);
area.add(area2);
panel.repaint();
}
});
JRadioButton subtractButton
=new JRadioButton("减",false);
buttonPanel.add(subtractButton);
group.add(subtractButton);
subtractButton.addActionListener(new
ActionListener()
{
public void actionPerformed(ActionEvent event)
{
area=new Area();
area.add(areal);
area.subTract(area2);
panel.repaint();
}
});
JRadioButton intersectButton
=new JRadioButton("交",false);
buttonPanel.add(intersectButton);
group.add(intersectButton);
intersectButton.addActionListener(new
ActionListener()
{
public void actionPerformed(ActionEvent event)
{
area=new Area():
area.add(areal);
area.intersect(area2);
panel.repaint();
}
});
JRadioButton exclusiveCIrButton
=new JRadioButton(“异或”,false);
buttonPanel.add(exelusiveOrButton);
group.add(exclusiveOrButton);
exclusiveOrButton.addActionListener(new
ActionListener()
{
public void actionPerformed(ActionEvent event)
{
area=new Area();
area.add(areal);
area.exclusiveor(area2);
panel.repaint();
}
});
contentPane.add(buttonPanel,BorderLayout.
NORTH);
}
private JPanel panel;
private Area area;
private Area areal;
private Area area2;
private static final int WIDTH=400;
private static final int HEIGHT=400;
}
第8题
第9题
注意:不改动程序的结构,不得增行或删行。
程序运行结果如下:
import java.net.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class ex28_3 extends JApplet implements ActionListener {
ButtonURL[] btnURL = new ButtonURL[3];
public void init() {
btnURL[0] = new ButtonURL("新浪网","http://www.sina.com.cn/");
btnURL[1] = new ButtonURL("163","http://www.163.com/");
btnURL[2] = new ButtonURL("搜狐","http://www.sohu.com/");
GridLayout gl = new GridLayout(1,3);
getContentPane().setLayout(gl);
for (int i = 0; i < btnURL.length; i++) {
btnURL[i].addActionListener(this);
getContentPane().add(btnURL[i]);
}
}
public void actionPerformed(ActionEvent ae) {
ButtonURL btnClick =ae.getSource();//获取发生事件的对象
try {
URL load = new URL(btnClick.strAddr);
getAppletContext().showDocument(strAddr);
} catch (MalformedURLException e) {
showStatus("Bad URL:" + btnClick.strAddr);
}
}
}
class ButtonURL extends JButton {
String strAddr;
ButtonURL(String strLabel, String strAddress) {
super(strLabel);
strAddr = strAddress;
}
}
ex28_3, html
<HTML>
<HEAD>
<TITLE>ex28_3</TITLE>
</HEAD>
<BODY>
<applet code="ex28_3.class" width=800 height=400 >
</applet>
</BODY>
</HTML>
第10题
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