OCJP(310-065)

单选题Click the Exhibit button. Given this code from Class B： 25.A a1 = new A（）； 26.A a2 = new A（）； 27.A a3 = new A（）； 28.System.out.println（A.getInstanceCount（））； What is the result？（）ACompilation of class A fails.BLine 28 prints the value 3 to System.out.

题目
单选题
Click the Exhibit button. Given this code from Class B： 25.A a1 = new A（）； 26.A a2 = new A（）； 27.A a3 = new A（）； 28.System.out.println（A.getInstanceCount（））； What is the result？（）
A

Compilation of class A fails.

B

Line 28 prints the value 3 to System.out.

C

Line 28 prints the value 1 to System.out.

D

A runtime error occurs when line 25 executes.

E

Compilation fails because of an error on line 28.

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相似问题和答案

第1题：

Click the Exhibit button.Given:What is the result?()

A.Line 26 prints "a" to System.out.

B.Line 26 prints "b" to System.out.

C.An exception is thrown at line 26 at runtime.

D.Compilation of class A will fail due to an error in line 6.


参考答案：A

第2题：

public class Threads3 implements Runnable {  public void run（） {  System.out.print（”running”）；  }  public static void main（String[] args） {  Thread t = new Thread（new Threads3（））；  t.run（）；  t.run（）；  t.start（）；  }  }  What is the result？（） 

  • A、 Compilation fails.
  • B、 An exception is thrown at runtime.
  • C、 The code executes and prints “running”.
  • D、 The code executes and prints “runningrunning”.
  • E、 The code executes and prints “runningrunningrunning”.

正确答案:E

第3题：

Click the Exhibit button. Which statement is true about the classes and interfaces in the exhibit?()

A.Compilation will succeed for all classes and interfaces.

B.Compilation of class C will fail because of an error in line 2.

C.Compilation of class C will fail because of an error in line 6.

D.Compilation of class AImpl will fail because of an error in line 2


参考答案：C

第4题：

1. public class A {  2.  3. private int counter = 0；  4.  5. public static int getInstanceCount（） {  6. return counter；  7. }  8.  9. public A（） {  10. counter++；  11. }  12.  13. }  Given this code from Class B：  25.A a1 =new A（）；  26. A a2 =new A（）；  27. A a3 =new A（）；  28. System.out.printIn（A.getInstanceCount（） ）； What is the result？（） 

  • A、 Compilation of class A fails.
  • B、 Line 28 prints the value 3 to System.out.
  • C、 Line 28 prints the value 1 to System.out.
  • D、 A runtime error occurs when line 25 executes.
  • E、 Compilation fails because of an error on line 28.

正确答案:A

第5题：

public class TestOne implements Runnable {  public static void main （String[] args） throws Exception {  Thread t = new Thread（new TestOne（））；  t.start（）；  System.out.print（”Started”）；  t.join（）；  System.out.print（”Complete”）；  }  public void run（） {  for （int i= 0； i< 4； i++） {   System.out.print（i）；  }  }  }  What can be a result？（）

  • A、 Compilation fails.
  • B、 An exception is thrown at runtime.
  • C、 The code executes and prints “StartedComplete”.
  • D、 The code executes and prints “StartedComplete0123”.
  • E、 The code executes and prints “Started0l23Complete”.

正确答案:E

第6题：

Click the Exhibit button. Given:Which two statements are true if a NullPointerException is thrown on line 3 of class C? ()

A.The application will crash.

B.The code on line 29 will be executed.

C.The code on line 5 of class A will execute.

D.The code on line 5 of class B will execute.

E.The exception will be propagated back to line 27.


参考答案：B, E

第7题：

public class Threads5 {  public static void main （String[] args） {  new Thread（new Runnable（） {  public void run（） {  System.out.print（”bar”）；  } }）.start（）；  }  }  What is the result？（） 

  • A、 Compilation fails.
  • B、 An exception is thrown at runtime.
  • C、 The code executes normally and prints “bar”.
  • D、 The code executes normally， but nothing prints.

正确答案:C

第8题：

Click the Exhibit button. Given: ClassA a = new ClassA(); a.methodA(); What is the result? ()

A.Compilation fails.

B.ClassC is displayed.

C.The code runs with no output.

D.An exception is thrown at runtime.


参考答案：D

第9题：

public class test {   public static void add3 （Integer i）{  int val = i.intValue （ ）；   val += 3；   i = new Integer （val）；    }     public static void main （String args [ ] ）  { Integer i = new Integer （0）；    add3 （i）；   system.out.printIn （i.intValue （ ） ）；   }    }   What is the result？（）

  • A、 Compilation will fail.
  • B、 The program prints “0”.
  • C、 The program prints “3”.
  • D、 Compilation will succeed but an exception will be thrown at line 3.

正确答案:B

第10题：

public class Threads4 {  public static void main （String[] args） {  new Threads4（）.go（）；  }  public void go（） {  Runnable r = new Runnable（） { public void run（） {  System.out.print（”foo”）；  }  }；  Thread t = new Thread（r）；  t.start（）；  t.start（）；  }  }  What is the result？（） 

  • A、 Compilation fails.
  • B、 An exception is thrown at runtime.
  • C、 The code executes normally and prints „foo”.
  • D、 The code executes normally， but nothing is printed.

正确答案:B

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