读下列程序 import java.awt.*; import java.awt.event.*; publid class MyApplet
阅读下列程序,请写出程序的运行结果。
import java.applet.*;
import javax.swing.*;
import java.awt.event.*;
public class C extends Applet implements ActionListener
{
int n=0;
JButton button;
public void init()
{
setSize(400,100);
button=new JButton("");
add(button);
button.addActionListener(this);
}
public void actionPerformed(ActionEvent e)
{
n++;
button.setText(n+"");
}
}
A.importjava.sql.*
B.importjava.util.*
C.importjava.io.*
D.importjava.net.*
阅读下列程序,写出程序功能。
import j ava. applet. *;
import j ava. awt. *;
import j ava. awt. event. *;
public class C3601 extends Applet implements ActionListener
{
AudioClip clip;
Button buttonPlay, buttonLoop, buttonStop;
public void init()
{
clip=getAudioClip(getCodeBase() , "1. wav") ;
buttonPlay=new Button("start") ;
buttonLoop=new Button("loop") ;
buttonStop=new Button("stop") ;
buttonPlay. addActionListener(this) ;
buttonStop. addActionListener(this) ;
buttonLoop. addActionListener(this) ;
setSize(300, 100) ;
add(buttonPlay) ; add(buttonLoop) ; add(buttonStop) ;
}
public void stop()
{
clip. stop() ;
}
public void actionPerformed(ActionEvent e)
{
if(e. get. Source() ==buttonPlay) {clip. play() ; }
else if(e. getSource() ==buttonLoop) {clip. loop() ; }
if(e. getSource() ==buttonStop) {clip. stop() ; }
}
}
下列Applet在坐标(20,20)处显示一幅GIF图像,请填写正确的程序在横线处。 import java.awt.*; import java.applet.*; import java.net.URL; public class Testl3 extends Applet { Image i; public void init() { URL url=getDocumentBase(); String name="IMG nClick=over(this) title=放大0, gif"; 【 】; } public void paint(Graphics g) { g.drawImage(i,20,20,this); } }
下列程序实现的功能是当按下键盘时,在Applet中通过paint()方法,在(50,50)位置处显示出按下的键的名称。在横线处填写正确的语句。 import java.awt.*; import java.awt.event.*; import java.applet.*; public class Test7 extends Applet { String str=""; public void init() { addKeyListener (new KeyAdapter() { public void keyPressed(KeyEvent ke) { 【 】; repaint(); } }); requestFocus(); } public void paint(Graphics g) { g.drawString("你按下的键是:" +str, 50,50); } }
下列程序实现的功能是当按下键盘时,在Applet中通过painnt()方法,在(50,50)位置处显示出按下的键的名称。在横线处填写正确的语句。 import java.awt.*; import java.awt.event.*; import java.applet.*; public class Test7 extends Applet { String str=" "; public void init() { addKeyListener (new KeyAdapter() { public void keyPressed(KeyEvent ke) { 【 】; repaint(); } }); requestFocus(); } public void paint(Graphics g) { g.drawString("你按下的键是:"+str,50,50); } { str=-ke.getKeyText(ke.getKeyCode())