更多"选择正确的语句填入下列程序的横线处。 import java．aw"的相关试题:
[单项选择]选择正确的语句填入下列程序的横线处。 import java.awt.*; public class ex26 { public static void main(String[] args) { Frame f = new Frame("ex26"); MenuBar mb = new MenuBar（ ）; ______ Menu m1 = new Menu("menu1"); Menu m2 = new Menu("menu2"); mb. add (ml); mb. add (m2); f.setSize(300, 100); f. setVisible (true); } }
A. setMenuBar(m;
B. msetMenuBar(;
C. setMenuBar(m;
D. msetMenuBar0;
[单项选择]请选择正确的语句填入下列程序的横线处。 import java.awt.*; public class ex40 { static Frame f; public static void main(String[] args) { f = new Frame("ex40"); MenuBar mb = new MenuBar（ ）; f.setMenuBar (mb); Menu m1 = new Menu("menu"); ______ m1.add (mil); mb. add (m1); f. setSize (200, 200); f. setVisible (true); } }
A. Menu mil = new MenuItem("iteml");
B. MenuItem mil = new MenuItem("iteml");
C. Menu mil = new MenuItem("iteml");
D. Menu mil = MenuItem("iteml");
[单项选择]请选择正确的语句填入下列程序的横线处。 import javax. Swing.*; import java.awt.*; import java.awt.event.*; public class ex46 { static String str= "单击次数:"; static intcnt = 0; public static void main(String[] args) { try{ UIManager.setLookAndFeel(UIManager. getCrossPlatformLookAndFeelClassName（ ）); } catch(Exception e) {} JFrame jf = new JFame("ex46"); JButton jb = new JButton("Button"); jb.addActionListener(new ActionListener（ ） { public void actionPerformed(ActionEvent ae) { cnt ++; j1.setText(str +cnt); } }); j1. setLabelFor (jb); jPanel jp = new JPanel（ ）; jp.setBorder(BorderFactory.createEmptyBorder(25, 25, 25, 25); jp.setLayout(new GridLayout(0, 1)); jp.add(jb); jp.add (j1); jf.getContenPanel（ ） .add(jp, "Center"); jf.pack（ ）; jf.setVisible (true); } }
A. Labelj1 = new JLabel(str + "0");
B. final JLabel j1 = new JLabel(str + "0");
C. final JLabelj1 = JLabel(str + "0");
D. JLabelj1 = new JLabel(str + "0");
[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]请在下列程序的横线处填入正确的语句。 import java.awt.*; import java.awt,event.*; public class ex16 { Frame f; TextArea ta; Button btn; public static void main(String[] args) { ex16 e = new ex16（ ）; e.m（ ）; } public void m（ ） { f = new Frame("ex16"); ta = new TextArea（ ）; btn = new Button("ok"); btn.addActionListener(new MyAction（ ）); f.add(ta, "Center"); f.add(btn, "South"); f.setSize(100, 100); f.setVisible (true); } class MyAction implements ActionListener { ______ { System. out.println (ta. getText （ ）); } } }
A. static void actionPcrformcd(AcfionEvent
B. public void action(ActionEwent
C. public actionPerformed(ActionEvent
D. public void actionPerformed(ActionEvent
[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]下列Applet实现了使用灰度值递减的顺序显示0～9，选择正确的语句填入横线处。 import java.applet.*; import java.awt.*; import java.awt.Color; public class ex24 extends Applet { public void paint(Graphics g) { int r = 0, g1 = 0, b = 0, j = 10; for(int i - 0; i ＜ 10; i ++) { g.setColor(new Color(r, g1, b)); r += 25; g1 +=25; b +=25; j += 10; } } }
A. drawString(i, j, 30);
B. drawString("" + i, j, 30);
C. drawString(i,j, 30);
D. drawstring("" + i,j, 30);
[单项选择]下列Applet实现了用不同颜色打印出大写字母A～J。请选择正确的语句填入横线处。 import java.applet.*; import java.awt.*; public class ex29 extends Applet { public void paint (Graphics gg) { int r = 0, g = 0, b = 0, j = 20; for(char ch = ’A’; ch ＜= ’J’; ch ++) { gg.drawString("" + ch, j, 30); if(ch - ’A’ % 3 == 0) r += 50; if(ch - ’B’ % 3 == 0) g += 30; if(ch - ’C’ % 3 == 0) b += 20; j +=17; } } }
A. setColor(ncw Color(r, g, );
B. gsetColor(new Color(r, g, );
C. setColor(new Color(r, g, );
D. gsetColor(Color(r, g, );
[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)；
[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 【8】 (Graphics g) {
g.drawSting(“how are you!”,10,10);
}
}
[单项选择]下列程序通过实现Runnable接口创建一个线程，选择正确的语句填入程序的横线处。
class MyRun implements Runnable
String str;
MyRun(String s)
str = s;
public void run（ ）
System.out.println(str);
public class ex40
public static void main(String[] args)
String name = "实现阶段Runnable 接口";
MyRun my = new MyRun(name);
Thread th =
th. start ( );
A. new MyRun(my) B. new Thread（ ）
C. new Thread(my) D. Thread(my)
[单项选择]下列程序在Frame中设定BorderLayout布局管理器，选择正确的语句填入程序的横线处。 import java.awt.*; public class ex43 extends Frame { public static void main(String[] args) { ex43 obj = new ex43("BorderLayout"); ______ obj.add("North", new Button("North")); obj.add("South", new Button("Sourth")); obj.add("East", new Button ("East")); obj.add("West", new Button ("West")); obj. add ("Center", new Button ( "Center" ) ); obj.pack（ ）; obj. setVisible (true); } public ex43(String str) { super (str); } }
A. obsetLayout(new BorderLayout());
B. setLayout(new Borderkayout());
C. setLayout(BorderLayout());
D. obsetLayout(BorderLayout());
[单项选择]选择正确的语句填在下列程序的横线处。 import java.awt.*; import java.awt.event.*; public class ex30 { Frame f; public static void main(String[] args) { ex30 e = new ex30（ ）; e. te st ( ); } public void test（ ） { f = new Frame("ex30"); ______ f.paok（ ）; f.setVisible(true); } class MyWindowListener extends WindowAdapter { public void windowClosing(WindowEvent e) { System.exit(1); } } }
A. addWindowListener(new MyWindowtistener());
B. addWindowListener(MyWindowListener());
C. addWindowAdapter(new MyWindowListener());
D. addWindowListener(new MyWindowListener());
[填空题]若要在D盘根目录下生成一个名为mydir的文件夹，请在下面横线处填入代码完成此程序。
import java.io.*;
public class FileTest
{
public static void main(String args[])
{
【7】
File fileObject1 = new File("Filel.txt");
File fileObject2 = new File("d://mydir", "File2.txt");
System.out.println(fileObject2);
try
{
dirObject.mkdir（ ）;
}catch(SecurityException e) {}
try
{
fileObject1.createNewFile（ ）;
fileObject2.createNewFilei);
}catch(IOException e) {}
}
}
