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单选题
class Base {  Base() { System.out.print(“Base”); }  }  public class Alpha extends Base {  public static void main( String[] args ) {  new Alpha();  new Base();  }  }  What is the result?()
A

 Base

B

 BaseBase

C

 Compilation fails.

D

 The code runs with no output.

E

 An exception is thrown at runtime.


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考题 单选题class Base {  Base() { System.out.print(“Base”); }  }  public class Alpha extends Base {  public static void main( String[] args ) {  new Alpha();  new Base();  }  }  What is the result?()A  BaseB  BaseBaseC  Compilation fails.D  The code runs with no output.E  An exception is thrown at runtime.

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考题 单选题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  trueB  nullC  falseD  Compilation fails.E  The code runs with no output.F  An exception is thrown at runtime.

考题 单选题What will be written to the standard output when the following program is run?()   class Base {  int i;  Base() {   add(1);   }   void add(int v) {  i += v;  }   void print() {  System.out.println(i);  }   }   class Extension extends Base {  Extension() {  add(2);  }   void add(int v) {  i += v*2;  }  }   public class Qd073 {   public static void main(String args[]) {  bogo(new Extension());  }   static void bogo(Base b) {  b.add(8);  b.print();   }   }A 9B 18C 20D 21E 22

考题 单选题public class Base {  public static final String FOO = “foo”;  public static void main(String[] args) {  Base b = new Base();  Sub s = new Sub();  System.out.print(Base.FOO);  System.out.print(Sub.FOO);  System.out.print(b.FOO);  System.out.print(s.FOO);  System.out.print(((Base)s).FOO);  } }  class Sub extends Base {public static final String FOO=bar;}  What is the result?()A  foofoofoofoofooB  foobarfoobarbarC  foobarfoofoofooD  foobarfoobarfooE  barbarbarbarbarF  foofoofoobarbarG  foofoofoobarfoo