请阅读代码: import java.awt.*; public class E11-4 { public static void m
A.P是t分布P(t£2)的累积概率
B.P是标准正态分布P(z£2)的累积概率
C.P是正态分布P(x£2)的累积概率
D.P是均匀分布P(x£2)的累积概率
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+"");
}
}
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JApplet使用重写paintComponet()方法来绘制图像,请填写正确的代码在横线处。 import java.awt.*; import javax.swing.*; public class Test extends JApplet { staic String fileName = "IMG nClick=over(this) title=放大().gif"; public void init() { Container cp = getContentPane(); cp.setLayout(new GridLayout(1,1)); Image i = getImage(getCodeBase(),fileName); MyImagePanel ip=new MyInmagePanel(i); cp.add(ip); } } class MyImagePanel extends JPanel { Image i; public MyImagePanel(Image IMG nClick=over(this) title=放大) { this.i = IMG nClick=over(this) title=放大; } public void paintComponent(Graphics gg) { 【 】; gg.drawImage(i,20,20,this); } }