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import java.awt*;   public class X extends Frame (   public static void main(string args) (  X x = new X ();   X.pack();   x.setVisible(true);  )  public X () (   setlayout (new GridLayout (2,2));   Panel p1 = new panel();    Add(p1);    Button b1= new Button (“One”);    P1.add(b1);   Panel p2 = new panel();    Add(p2);   Button b2= new Button (“Two”);    P2.add(b2);    Button b3= new Button (“Three”);   add(b3);   Button b4= new Button (“Four”);   add(b4);   )   )   Which two statements are true? ()

  • A、 All the buttons change height if the frame height is resized.
  • B、 All the buttons change width if the Frame width is resized.
  • C、 The size of the button labeled “One” is constant even if the Frame is resized.
  • D、 Both width and height of the button labeled “Three” might change if the Frame is resized.

参考答案

更多 “ import java.awt*;   public class X extends Frame (   public static void main(string args) (  X x = new X ();   X.pack();   x.setVisible(true);  )  public X () (   setlayout (new GridLayout (2,2));   Panel p1 = new panel();    Add(p1);    Button b1= new Button (“One”);    P1.add(b1);   Panel p2 = new panel();    Add(p2);   Button b2= new Button (“Two”);    P2.add(b2);    Button b3= new Button (“Three”);   add(b3);   Button b4= new Button (“Four”);   add(b4);   )   )   Which two statements are true? ()A、 All the buttons change height if the frame height is resized.B、 All the buttons change width if the Frame width is resized.C、 The size of the button labeled “One” is constant even if the Frame is resized.D、 Both width and height of the button labeled “Three” might change if the Frame is resized.” 相关考题
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考题 选择正确的叙述. class Happy extends Frame. { Happy() { SetLayout(new GridLayout(2,2)); Panel p1 = new Panel(); add(p1); p 1.add( new Button("One")); Panel p2 = new Panel(); add(p2); p 2.add( new Button("Two")); add( new Button("Three")); add( new Button("Four")); s()A.当frame调整大小时,按钮Three和Four 的大小也将调整。B.当frame调整大小时,所有按钮的大小都将调整。C.当frame调整大小时,按钮Two和Four 的大小也将调整。D.当frame调整大小时,按钮One和Two 的大小也将调整。

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考题 interface A{int x = 0;}class B{int x =1;}class C extends B implements A {public void pX(){System.out.println(x);}public static void main(String[] args) {new C().pX();}}

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考题 下列程序采用BorderLayout布局管理,选择正确的语句填入横线处,实现在North区域显示一个名字为“北方”的Button构件。 import java.awt.*; public class ex48 { public static void main(String[] args) { frame. frm = new Frame. ("北方"); frm.setLayout(new BorderLayout()); frm.setSize(200, 200); frm.setVisible(true); } }A.add("Nouth", new Button("北方"));B.frm.add("South", new Button("北方"));C.frm.add("Nouth", new Button("北方"));D.Frm.add("South", Button("北方"));

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考题 本题的功能是获取鼠标在窗口中的位置。当鼠标移进窗口中,就会实时显示鼠标在窗口中的相对位置,比如显示为"鼠标的当前位置:X:Y"(其中,X为横坐标,Y为纵坐标)。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();}}}

考题 本题使用下拉菜单来控制字体,窗口中有一个标签和一个下拉菜单,当选中下拉菜单中的任一项字体时,标签上字符串的字体就随之改变。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();}}

考题 以下程序调试结果为:public class Test {int m=5;public void some(int x) {m=x;}public static void main(String args []) {new Demo().some(7);}}class Demo extends Test {int m=8;public void some(int x) {super.some(x);System.out.println(m);}}A.5B.8C.7D.无任何输出E.编译错误

考题 现有:  class Top  {     static int X=l;  public Top()  {  x*=3; }     }  class Middle extends Top  {      public  Middle()    {x+=l;  }  public static void main(String  []  args)  {     Middle m=new Middle();    System.out.println (x);    }     }  结果是什么?()    A、  2B、  3C、  4D、编译失败

考题 Which statements, when inserted at the indicated position in the following code, will cause a runtime exception when attempting to run the program?()   class A {}   class B extends A {}   class C extends A {}   public class Q3ae4 {   public static void main(String args[]) {   A x = new A();   B y = new B();   C z = new C();   // insert statement here   }   } A、x = y;B、z = x;C、y = (B) x;D、z = (C) y;E、y = (A) y;

考题 public class A extends Thread {  A() {  setDaemon(true);  }  public void run() {  (new B()).start();  try {  Thread.sleep(60000);  } catch (InterruptedException x) {}  System.out.println(“A done”);  }  class B extends Thread {  public void run() {  try {  Thread.sleep(60000);  } catch (InterruptedException x) {}  System.out.println(“B done”);  }  }  public static void main(String[] args) {  (new A()).start();  }  }   What is the result?()  A、 A doneB、 B doneC、 A done B doneD、 B done A doneE、 There is no exception that the application will print anything.F、 The application outputs “A done” and “B done”, in no guaranteed order.

考题 Given the following code, which code fragments, when inserted at the indicated location, will succeed in making the program display a button spanning the whole window area?()   import java.awt.*;   public class Q1e65 {   public static void main(String args[]) {   Window win = new Frame();   Button but = new Button("button");   // insert code fragment here  win.setSize(200, 200);   win.setVisible(true);   }   }  A、win.setLayout(new BorderLayout()); win.add(but);B、win.setLayout(new GridLayout(1, 1)); win.add(but);C、win.setLayout(new BorderLayout()); win.add(but, BorderLayout.CENTER);D、win.add(but);E、win.setLayout(new FlowLayout()); win.add(but);

考题 class Top {  static int x = 1;  public Top(int y) { x *= 3; }  }  class Middle extends Top {  public Middle() { x += 1; }  public static void main(String [] args) {  Middle m = new Middle();  System.out.println(x);  }  }  结果为:() A、1B、2C、3D、编译失败

考题 import java.awt.*;   public class X extends Frame {   public static void main (String args) {   X x = new X();   x.pack();   x.setVisible(true);   }  public X() {   setLayout (new BordrLayout());   Panel p = new Panel ();   add(p, BorderLayout.NORTH);   Button b = new Button (“North”);   p.add(b):   Button b = new Button (“South”);   add(b1, BorderLayout.SOUTH):   }   }   Which two statements are true?()A、 The buttons labeled “North” and “South” will have the same width.B、 The buttons labeled “North” and “South” will have the same height.C、 The height of the button labeled “North” can very if the Frame is resized.D、 The height of the button labeled “South” can very if the Frame is resized.E、 The width of the button labeled “North” is constant even if the Frame is resized.F、 The width of the button labeled “South” is constant even if the Frame is resized.

考题 import java.awt.*;   public class Test extends Frame {   public Test() {   add(new Label(“Hello”) );   add(new TextField(“Hello”) );   add(new Button(“Hello”) );   pack();   show();    }   public static void main(String args) {   new Test ();   }   }   What is the result? () A、 The code will not compile.B、 A Window will appear containing only a Button.C、 An IllegalArgumentException is thrown at line 6.D、 A Window button will appear but will not contain the Label, TextField, or Button.E、 A Window will appear containing a Label at the top, a TextField below the Label, and a Button  below the TextField.F、 A Window will appear containing a Label on the left, a TextField to the right of the Label, and a button to the right of the TextField.

考题 单选题public class A extends Thread {  A() {  setDaemon(true);  }  public void run() {  (new B()).start();  try {  Thread.sleep(60000);  } catch (InterruptedException x) {}  System.out.println(“A done”);  }  class B extends Thread {  public void run() {  try {  Thread.sleep(60000);  } catch (InterruptedException x) {}  System.out.println(“B done”);  }  }  public static void main(String[] args) {  (new A()).start();  }  }   What is the result?()A  A doneB  B doneC  A done B doneD  B done A doneE  There is no exception that the application will print anything.F  The application outputs “A done” and “B done”, in no guaranteed order.

考题 单选题import java.awt.*;   public class Test extends Frame {   public Test() {   add(new Label(“Hello”) );   add(new TextField(“Hello”) );   add(new Button(“Hello”) );   pack();   show();    }   public static void main(String args) {   new Test ();   }   }   What is the result? ()A  The code will not compile.B  A Window will appear containing only a Button.C  An IllegalArgumentException is thrown at line 6.D  A Window button will appear but will not contain the Label, TextField, or Button.E  A Window will appear containing a Label at the top, a TextField below the Label, and a Button  below the TextField.F  A Window will appear containing a Label on the left, a TextField to the right of the Label, and a button to the right of the TextField.

考题 单选题Which statements, when inserted at the indicated position in the following code, will cause a runtime exception when attempting to run the program?()   class A {}   class B extends A {}   class C extends A {}   public class Q3ae4 {   public static void main(String args[]) {   A x = new A();   B y = new B();   C z = new C();   // insert statement here   }   }A x = y;B z = x;C y = (B) x;D z = (C) y;E y = (A) y;

考题 单选题现有:  class Top  {     static int X=l;  public Top()  {  x*=3; }     }  class Middle extends Top  {      public  Middle()    {x+=l;  }  public static void main(String  []  args)  {     Middle m=new Middle();    System.out.println (x);    }     }  结果是什么?()A   2B   3C   4D 编译失败