1.class TestSuper { 22.TestSuper（int i） { } 3. } 4.class TestSub extends TestSuper{ } 5.class TestAll { 6.public static void main （String [] args） { 7.new TestSub（）； 8.} 9.} Which is true？（）  

A、 Compilation fails.

B、 The code runs without exception.

C、 An exception is thrown at line 7.

D、 An exception is thrown at line 2.

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  A

   String s = strings.get（0）；

  B

   Iterator i1 = strings.iterator（）；

  C

   String[] array1 = strings.toArray（）；

  D

   Iterator i2 = strings.iterator（）；

  E

   String[] array2 = strings.toArray（new String[1]）；

  F

   Iterator i3 = strings.iterator（）；

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• package geometry；  public class Hypotenuse {  public InnerTriangle it = new InnerTriangle（）；  class InnerTriangle {  public int base；  public int height；  }  }  Which is true about the class of an object that can reference the variable base？ （）

  A、 It can be any class.

  B、 No class has access to base.

  C、 The class must belong to the geometry package.

  D、 The class must be a subclass of the class Hypotenuse.

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• public class Foo implements Runnable （  public void run （Thread t） {  system.out.printIn（“Running.”）；  }  public static void main （String[] args）  {  new thread （new Foo（））.start（）；  } ）   What is the result？（）      

  A、 An exception is thrown.

  B、 The program exists without printing anything.

  C、 An error at line 1 causes compilation to fail.

  D、 An error at line 2 causes the compilation to fail.

  E、 “Running” is printed and the program exits.

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• Which two are true about has-a and is-a relationships？（）

  A

   Inheritance represents an is-a relationship.

  B

   Inheritance represents a has-a relationship.

  C

   Interfaces must be used when creating a has-a relationship.

  D

   Instance variables can be used when creating a has-a relationship.

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• Which capability exists only in java.io.BufferedWriter？（）

  A、Closing an open stream.

  B、Flushing an open stream.

  C、Writing to an open stream.

  D、Writing a line separator to an open stream.

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