单选题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 

第1题：

public class Test {  public static void main（String [] args） {  boolean assert = true；  if（assert） {  System.out.println（”assert is true”）；  }  }  } Given：  javac -source 1.3 Test.java  What is the result？（） 

• A、 Compilation fails.
• B、 Compilation succeeds with errors.
• C、 Compilation succeeds with warnings.
• D、 Compilation succeeds without warnings or errors.

第2题：

public class Alpha{  private static Character（） ids；  public static void main（ String[] args）{  ids = new Character[args.length]；  for （int i=0； iids[i] = new Character（ args[i] ）；  System.out.print（ ids[i] ）；  }  }  }   What is correct？（）  

• A、 Compilation fails.
• B、 The code runs with no output.
• C、 An exception is thrown at runtime.
• D、 The code runs， outputing a concatenated list of the arguments passed to the program.

第3题：

第4题：

class Super {  public int i = 0；  public Super（String text） {  i = 1； }  }  public class Sub extends Super {  public Sub（String text） {  i = 2；  }   public static void main（String args[]） {  Sub sub = new Sub（“Hello”）；  System.out.println（sub.i）；  }  }  What is the result？（）  

• A、 0
• B、 1
• C、 2
• D、 Compilation fails.

第5题：

public class Alpha{  public static void main（ string[] args ）{  if （ args.length == 2 ） {  if （ args.[0].equalsIgnoreCase（“-b”） ）  System.out.println（ new Boolean（ args[1] ））；  }  }  }   And the code is invoked by using the command： java Alpha –b TRUE   What is the result？（）  

• A、 true
• B、 null
• C、 false
• D、 Compilation fails.
• E、 The code runs with no output.
• F、 An exception is thrown at runtime.

第6题：

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.

第7题：

1. public class X {  2. public static void main （String[]args）   {  3. int [] a = new int [1]  4. modify（a）；  5. System.out.printIn（a[0]）；  6. }  7.    8. public static void modify （int[] a）  {  9.   a[0] ++；  10.    } 11. }       What is the result？（）

• A、 The program runs and prints “0”
• B、 The program runs and prints “1”
• C、 The program runs but aborts with an exception.
• D、 An error “possible undefined variable” at line 4 causes compilation to fail.
• E、 An error “possible undefined variable” at line 9 causes compilation to fail.

第8题：

class MyThread extends Thread {  public void run（） { System.out.println（“AAA”）； }  public void run（Runnable r） { System.out.println（“BBB”）； }  public static void main（String[] args） {  new Thread（new MyThread（））.start（）；  }  }   What is the result？（）  

• A、 AAA
• B、 BBB
• C、 Compilation fails.
• D、 The code runs with no output.

第9题：

1. public class ForBar  {  2. public static void main（String []args）   {  3.   int i = 0， j = 5；  4. tp： for （；；）  {  5. i ++；  6. for（；；）  7. if（i > --j） break tp；  8. }  9. system.out.printIn（“i = ” + i + “， j = “+ j）；  10. }  11. }   What is the result？（）  

• A、 The program runs and prints “i=1， j=0”
• B、 The program runs and prints “i=1， j=4”
• C、 The program runs and prints “i=3， j=4”
• D、 The program runs and prints “i=3， j=0”
• E、 An error at line 4 causes compilation to fail.
• F、 An error at line 7 causes compilation to fail.

第10题：

1. class Pizza {  2. java.util.ArrayList toppings；  3. public final void addTopping（String topping） {  4. toppings.add（topping）； 5. }  6. }  7. public class PepperoniPizza extends Pizza {  8. public void addTopping（String topping） {  9. System.out.println（”Cannot add Toppings”）；  10. }  11. public static void main（String[] args） {  12. Pizza pizza = new PepperoniPizza（）；  13. pizza.addTopping（”Mushrooms”）；  14. }  15. }  What is the result？（） 

• A、 Compilation fails.
• B、 Cannot add Toppings
• C、 The code runs with no output.
• D、 A NullPointerException is thrown in Line 4.