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单选题
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 (straing args[])   (  sub sub = new sub (“Hello”);  system.out. PrintIn(sub.i);  )    )   What is the result?()
A

 Compilation will fail.

B

 Compilation will succeed and the program will print “0”

C

 Compilation will succeed and the program will print “1”

D

 Compilation will succeed and the program will print “2”


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考题 单选题class super {  public int getLength()  {return 4;}  }  public class Sub extends Super {  public long getLength() {return 5;}  public static void main (String[]args)  {  super sooper = new Super ();  Sub sub = new Sub();  System.out.printIn(  sooper.getLength()+ “,” + sub.getLength()   };  }  What is the output?()A  4, 4B  4, 5C  5, 4D  5, 5E  The code will not compile.

考题 单选题class Super {  public Integer getLenght() { return new Integer(4); } }  public class Sub extends Super {  public Long GetLenght() { return new Long(5); }  public static void main(String[] args) { Super sooper = new Super();  Sub sub = new Sub();  System.out.println(  sooper.getLenght().toString() + “,” +  sub.getLenght().toString() ); } }  What is the output?()A  4,4B  4,5C  5,4D  5,5E  Compilation fails.

考题 单选题class A {  public A() {  System.out.println(“hello from a”);  }  }  class B extends A {  public B () {  System.out.println(“hello from b”);  super();  }  }  public class Test {  public static void main(String args[]) {  A a = new B();  }  }   What is the result when main is executed?()A  Compilation fails.B  hello from aC  hello from bD  hello from b hello from aE  hello from a hello from b

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考题 单选题public class Test {  public static void leftshift(int i, int j) {  i=j;  }  public static void main(String args[])  {  int i = 4, j = 2;  leftshift(i, j);   System.out.printIn(i); }  }     What is the result?()A  2B  4C  8D  16E  The code will not compile.

考题 单选题class Super {  public int getLenght( ) { return 4; }  }  public class Sub extends Super {  public long getLenght( ) { return 5; }  public static void main(String[] args) {  Super sooper = new Super( );  Sub sub = new Sub( );  System.out.println(  sooper.getLenght( ) + “,” + sub.getLenght( ) );  }  } What is the output?()A  Just after line 13.B  Just after line 14.C  Just after line 15.D  Just after line 16 (that is, as the method returns).

考题 单选题class super {   public int getLength() {return 4;}    }   public class Sub extends Super {   public long getLength() {return 5;}   public static void main (Stringargs) {   super sooper = new Super ();  Sub sub = new Sub();   System.out.printIn(   sooper.getLength()+ “,” + sub.getLength() };   }   What is the output?()A  4, 4B  4, 5C  5, 4D  5, 5E  The code will not compile.

考题 单选题public class Test {  public static void replaceJ(string text)  {  text.replace (‘j’, ‘l’);  }  public static void main(String args[])  {  string text = new String (“java”)  replaceJ(text);  system.out.printIn(text);  }  }      What is the result?()A  The program prints “lava”B  The program prints “java”C  An error at line 7 causes compilation to fail.D  Compilation succeeds but the program throws an exception.