更多"在下列Java applet程序的横线处填入代码,使程序完整并能够正确"的相关试题:
[填空题]在下面Java applet程序的横线处填入代码,使程序完整并能够正确运行。
import java.awt. *:
import java.applet.*;
public class Greeting extends Applet
public void ______ (Graphics g)
g.drawString("how are you!",10,10);
[填空题]在下列Java applet程序的横线处填入代码,使程序完整并能够正确运行。
Import java.awt.*;
Import java.applet.*;
Public class Greeting extends applet
Public void______(Graphics g)
g.drawSting("how are you!",10,10)______
[填空题]在下面Java applet程序的横线处填入代码,使程序完整并能够正确运行。
import java.awt. *:
import java.applet.*;
public class Greeting extends Applet {
public void ______ (Graphics g) {
g.drawString("how are you!",10,10);
}
}
[单项选择]下列Applet用于显示提供它的主机的IP地址。请选择正确的语句填入横线处。 import java.awt.*; import java. awt. event.*; import java.applet.Applet; import java.net. *; public class ex23 extends Applet { public void init( ) { setLayout(new GridLayout(2, 1); Button btm = new Button("显示IP"); final Label 1 = new Label(" "); btn. addActionListener (new ActionListener ( ) { public void actionPerformed(ActionEvent ae) { try { URL ur1 = getCodeBase( ); String strName = ur1.getHost( ); ______ 1.setText (ia.toString( )); } catch (Exception e) { e.printStackTrace ( ); } } }); add (btn); } }
A. InetAddress ia = URgetByName(strNam;
B. InetAddress ia = InetAddresgetByName(strNam;
C. InetAddress ia = new InetAddresgetByName(strNam;
D. InetAddress ia = InetAddresgetByName(ur1);
[单项选择]下列Applet实现画一条连接窗口右上角的直线。选择正确的语句填入横线处。 import java.applet.*; import java.awt.*; public class ex25 extends Applet { public void paint (Graphics g) { Dimension d; d = getSize( ); ______ } }
A. drawLine(width, aheight, 0, 0);
B. drawLine(0, height, width, 0);
C. drawLine(0, 0, width, 0);
D. drawLine(0, height, 0, widt;
[单项选择]关于下面程序段的说法,正确的是
import java.applet.*;
import java.awt.*;
public class Test extends Applet
Image img;
public void init( )
img=new Image( );
public void paint(Graphics g)
g.drawImage(img,0,0,this);
A. 该程序段可以正常运行
B. 程序中所创建的Image为空,但可以显示
C. 程序中所创建的Image不为空
D. 程序中所创建的Image为空,不能显示
[填空题]将下面Applet程序补充完整。
import java.awt.*:
import java.apptet.*;
public class Hi ______ {
public void paint(Graghics g) {
g.drawstring("Hi!",2.5,2.5);
}
}
[填空题]在下面Java Applet程序的下画线处填入代码,使程序完整并能够正确运行。
import java.applet.*;
import java.awt.*;
public class HelloWorld ______ {
public void paint(Graphics g) {
g.drawString("Hello World!",25,25);
}
}
[填空题]在下面Java Applet程序的下画线处填入代码,使程序完整并能够正确运行。
import java.applet.*;
import java.awt.*;
public class HelloWorld ______
public void paint(Graphics g)
g.drawString("Hello World!",25,25);
[填空题]在下列Java Applet程序的下画线处填入代码,使程序完整并能够正确运行。
import java.applet.*;
import java.awt.*;
public class HelloWorld______
public void paint(Graphics g)
g.drawString("Hello World!",25,25);
[单项选择]描述以下的applet: import java.applet.Applet; import java.awt.event.*; import java.awt.*; public class MyApplet extends Applet { Button b1, b2; public void init( ) { ActionListener a = new ActionListener( ) { public void actionPerformed(ActionEvent evt) { if(evt.getSource( ) == bl) { b1.setEnabled(false); b2.setEnabled(true); } else { b1.setEnabled(true); b2.setEnabled(false); } } } b1 = new Button("1"); b1.addActionListener(a); add(b1); b2 = new Button("2"); b2.addActionListener(a); add(b2); } } 选择所有正确的答案______。
A. applet上只有一个按钮,但它什么都不做
B. applet上什么也没有
C. applet上有两个按钮,当用户单击一个按钮时,它将成为disabled:当用户单击另一个按钮时,另一个将成为enabled
D. 当用户单击按钮时,什么都不会发生
[单项选择]要下列Java Applet程序完整并能够正确运行,横线处应填入的内容是______。
import java. applet. * ;
import java. awt. * ;
public class HelloWorld
public void paint(Graphics g)
g. drawString("Hello World!", 25, 25);
A. extends Thread
B. extends Applet
C. extends Char
D. extends Float
[简答题]阅读下列程序,写出程序能。
import java. applet.*;
import java. awt. *;
public class C3602 extends,Applet implements Runnable
Thread myThread=null;
public void start( )
setSize(300,200);
if(myThread==null)myThread=new Thread(this);
myThread. start( );
public void run( )
while(true)
trymyThread. sleep(500);
catch(InterruptedException e)
repaint( );
public void paint(Graphics g)
double i=Math. random( );
if(i<0.33)g.setColor(Color.yellow);
else if(i<0.66)g.setColor(Color. red);
else g.setColor(Color. blue);
int x=(int)(100*i);
g.fillOval(x,x,x,x);
[简答题]阅读下列程序,写出程序功能。
import java.applet.*;
import java. awt.*;
import java. 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( );
[填空题]将下列的程序补充完整。
import java.applet.Applet;
import java.awt.Graphics;
public class Applet2 extends Applet
public void print(Graphics gap)
int i=678;
gap.drawstring(Integer. ______ (i),20,60);