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单选题
package test1;  public class Test1 {  static int x = 42;  }  package test2;  public class Test2 extends test1.Test1 {  public static void main(String[] args) { System.out.println(“x = “ + x);  }  }  What is the result?()
A

 x = 0

B

 x = 42

C

 Compilation fails because of an error in line 2 of class Test2.

D

 Compilation fails because of an error in line 3 of class Test1.

E

 Compilation fails because of an error in line 4 of class Test2.


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考题 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、 0B、 1C、 2D、 Compilation fails.

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考题 单选题public class Test {  public static void main(String[] args) {  int x = 0;  assert (x  0) ? “assertion failed” : “assertion passed”;  System.out.println(“Finished”);  }  }  What is the result?()A  finishedB  Compilation fails.C  An AssertionError is thrown and finished is output.D  An AssertionError is thrown with the message “assertion failed”.E  An AssertionError is thrown with the message “assertion passed”.

考题 单选题interface DeclareStuff{  public static final int EASY = 3;  void doStuff(int t); }  public class TestDeclare implements DeclareStuff {  public static void main(String [] args) {  int x=5;  new TestDeclare().doStuff(++x);  }  void doStuff(int s) {  s += EASY + ++s;  System.out.println(”s “ + s);  }  }  What is the result?()A  s 14B  s 16C  s 10D  Compilation fails.E  An exception is thrown at runtime.

考题 单选题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 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

考题 单选题public class Test {  public static void main(String[] args) {  int x = 0;  assert (x  0): “assertion failed”;  System.out.println(“finished”);  }  }  What is the result?()A  finishedB  Compilation fails.C  An AssertionError is thrown.D  An AssertionError is thrown and finished is output.