Test : Java_22

This test contains 10 questions based on Java.
Each question answered correctly awards you 1 point and each incorrect answer has a penalty of -0.25 points, no points are deducted for unattempted answers.

Select Test Type

You Get +1 for each correct answer and -0.25 for each incorrect answer

Time Left - minutes :seconds

Which of these keywords is used to manually throw an exception?

catch	finally
throw	try

C

What is the output of this program?

class access{
        public int x;
  private int y;
        void cal(int a, int b){
            x =  a + 1;
            y =  b;
        }        
    }    
    class access_specifier {
        public static void main(String args[])
        {
            access obj = new access();   
            obj.cal(2, 3);
            System.out.println(obj.x + " " + obj.y);     
        }
   }

3 3	2 3
Runtime Error	Compilation Error

C

Given the code String s = new String("abc"); Which of the following calls are valid? (A) s.trim() (B) s.replace('a', 'A') (C) s.substring(3) (D) s.toUppercase() (E) s.setCharAt(1,'A') (F) s.append("xyz")

(A), (C), (D) & (E)	(A), (B) & (C)
(A), (B), (C) & (D)	(C), (D) & (E)

C

Which of these statement is incorrect?

Applets do not require a main() method at all.	Every class must contain a main() method.
There can be only one main() method in a program.	main() method must be made public.

B

what will be the output int i=20; System.out.println(++i + ++i);

40	42
43	44

C

++i will increment value first then use Therefore i++ + ++i= 21 + 22 =43

Which of interface contains all the methods used for handling thread related operations in Java?

Runnable interface	ThreadHandling interface
Math interface	System interface

B

What is the output of this program?

class static_out {
        static int x;
  static int y;
        int add(int a, int b){
            x = a + b;
            y = x + b;
        }
    }    
    class static_use {
        public static void main(String args[])
        {
            static_out obj1 = new static_out();
            static_out obj2 = new static_out();   
            int a = 2;
            obj1.add(a, a + 1);
            obj2.add(5, a);
            System.out.println(obj1.x + " " + obj2.y);     
        }
   }

7 7	6 7
7 9	9 7

C

Which of these methods deletes all the elements from invoking collection?

clear()	reset()
delete()	refresh()

A

clear() method removes all the elements from invoking collection.

Which of these access specifiers can be used for an interface?

Public	Protected
private	All of the mentioned

A

What is the output of this program?

 class output {
        public static void main(String args[])
        { 
           String c = "Hello i love java";
           boolean var;
           var = c.startsWith("hello");
           System.out.println(var);
        }
    }

true	false
0	1

B

Finish Test