SCJP Classes and objects free sample questions

61)

interface I{
final class C1   {     //1
    static int i=9;; //2
}
}
class C2 implements I{
public static void main(String a[]){
    System.out.println(I.C1.i); ///3
}}

compile time error at line 1

compile time error at line 2

compile time error at line 3

prints 9

Runtime exception

Explanation:
interfaces classes are by default static,final. so,no compile time errors are genearated

Ans: 4

62)

class C{
public static void main(String[] args) {
try
    {
        try
           {
               try
                 {
                   }
                 catch(RuntimeException e)
                 {
                  }
             }
           catch(Exception e)
           {
            }

      }
    catch(NullPointerException e)
    {
        }
     finally
    {
              System.out.println("finally");

      }
}}

Prints finally

compile time error

Runtime Exception

None of the above

Explanation:
No Explanation Available

Ans: 1

63)

class C {
public static void main ( String ka [ ] ) {
          while ( false ) {
                  System.out.println ( "Value" ) ;
          }
}
}

compile time error

prints Value infinitely

Runtime Exception

None of the above

Explanation:
No Explanation Available

Ans: 1

64)

class C {
public static void main(String[] args) {
System.out.println(4+5+"String");
}}

prints 9string

prints 45string

compile time error

Runtime exception

None of the above

Explanation:
arguments to the method are evalutated from left to right so 4+5+"string" ==> 9+string==>9string

Ans: 1

65)

class H {
public static void main (String[] args) {
    String s1 = "HHH";
    StringBuffer sb2 = new StringBuffer(s1);
    System.out.print(sb2.equals(s1) + "," + s1.equals(sb2));
}}

Prints: false,false

Prints: true,false

Prints: false,true

Prints: true,true

None of the above

Explanation:
s1 and sb2 are pointing to different object references

Ans: 1

66)

The relationship between a class and its superclass is

has-a

is -a

None of the above

Explanation:
No Explanation available

Ans: 2

67)

class A extends Thread {
private int i;
public void run() {i = 1;}
public static void main(String[] args) {
    A a = new A();
    a.run();
    System.out.print(a.i);
}}
How many threads are created in this Program?

Ans: 1

Ans: 2

Ans: 3

0

None of the above

Explanation:
Main thread is a thread and calling run methods will not creat thread.

Ans: 1

68)

String objects once created can not be modified

true

false

Explanation:
No Explanation available

Ans: 1

69)

Which of the following modifiers can be applied to a class that is not a nested class?

public

protected

private

static

Explanation:
No Explanation Available

Ans: 1

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