What is the numerical range of a char？（）   

A、 0 ... 32767

B、 0 ... 65535

C、 –256 ... 255

D、 –32768 ... 32767

E、 Range is platform dependent.

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  A、 FlowLayout

  B、 CardLayout

  C、 North and South of BorderLayout

  D、 East and West of BorderLayout

  E、 GridLayout

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• public class Test {  public static void main（String [] args） {  int x =5；  boolean b1 = true；  boolean b2 = false；  if（（x==4） && !b2）  System.out.print（”l “）；  System.out.print（”2 “）；  if （（b2 = true） && b1）  System.out.print（”3 “）；  } }  What is the result？（） 

  A、 2

  B、 3

  C、 1 2

  D、 2 3

  E、 1 2 3

  F、 Compilation fails.

  G、 Au exceptional is thrown at runtime.

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• public class Test {  public static void main（String args[]） {  class Foo {  public int i = 3； }  Object o = （Object）new Foo（）；   Foo foo = （Foo）o；  System.out.println（“i = “ + foo.i）； }  }  What is the result？（）  

  A、 i = 3

  B、 Compilation fails.

  C、 A ClassCastException is thrown at line 6.

  D、 A ClassCastException is thrown at line 7.

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• ClassOne.java  1. package com.abc.pkg1；  2. public class ClassOne {  3. private char var = ‘a’；   4. char getVar（）  {return var；}  5. }  ClassTest.java    1. package com.abc.pkg2；  2. import com.abc.pkg1.ClassOne；  3. public class ClassTest extends ClassOne {  4.   public static void main（String[]args）  {  5.     char a = new ClassOne（）.getVar（）；  6.     char b = new ClassTest（）.getVar（）；   7.   }  8. }      What is the result？（）  

  A、 Compilation will fail.

  B、 Compilation succeeds and no exceptions are thrown.

  C、 Compilation succeeds but an exception is thrown at line 5 in ClassTest.java.

  D、 Compilation succeeds but an exception is thrown at line 6 in ClassTest.java.

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• Which statements concerning the methods notify（） and notifyAll（） are true？  

  A

  Instances of class Thread have a method called notify（）.

  B

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  C

  The method notify（） is synchronized.

  D

  The method notifyAll（） is defined in class Thread.

  E

  When there is more than one thread waiting to obtain the monitor of an object， there is no way to be  sure which thread will be notified by the notify（） method.

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