MCQ Test-1

MCQ Test Series

Test-1

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1. Which of the following is FALSE about the Singleton Class?

A. It provides the private constructor only.

B. It provides a static factory method to return the instance of the class.

C. It provides a public static reference of the same class type.

D. None of These

2. What will be the output: 
class Continue {
     public static void main(String args[]){
           for(int i=0; i<5; i++) {
                        System.out.print(i + " ");
                        if (i%2 == 0) continue;
                        System.out.print("No Continue ");
                }
          }
 }

A. 0 1 No Continue 2 No Continue3 4

B. 0 1 No Continue 2 3 No Continue 4

C. 0 No Continue 1 2 No Continue 3 4

D. Compilation Error

3. What will be the output?
public class Test{
      public static void main(String args[]){
            int i = 1;
            do{
                      i--;
                }while(i > 2);
            System.out.println(i);
      }
}

A. -1                B. 0                  C. 1                 D. 2

4. Which of the following statement is TRUE about the following method?

 public void test(int a)
{
    int x = 1;
    if(x)
    {
        System.out.println("X");
    }
    else
    {
        System.out.println("Y");
    }
}

A. It will always print X

B. It will always print Y

C. Compilation Error

D. Runtime Error

5. switch(x)
{
    default: 
        System.out.println("Hello");
}
Which two are acceptable types for x?

A. byte and char           B. char and float

C. long and float           D. char and double

6. What is the output of this program?

    class Output {
        public static void main(String args[])
        {   
             int a = 5, b = 10;
             first: {
                second: {
                        third: {
                             if (a ==  b >> 1)     break second;
                          }
                   System.out.println(a);
                }
                System.out.println(b);
             }
        }
    }

A. 5 10                        B. 5 5               C. 5                 D. 10

7. What will be the output of the following program?
    class selection {
        public static void main(String args[])
        {
            int var1 = 5, var2 = 6;
            if ((var2 = 1) == var1)
                System.out.print(var2);
            else
                System.out.print(++var2);
        }
    }

A. 1                 B. 2                  C. 6                 D. 7

8. If an expression contains int, double, float, and long type variables, then whole expression will be promoted into which of these data types?

A. long                         B. int                            C. double                     D. float

9. What will be the Output of the following program?

 
class A{
        public static void main(String args[]){
         int x;
          x = 10;
         if(x == 10){
          int y = 20;
          System.out.print("x and y: "+ x + " " + y);
          y = x*2;
         }
         y = 100;
         System.out.print("x and y: " + x + " " + y);
        }
}

A. 10 20 10 100                      B. 10 20 10 20            

C. 10 20 10 10                        D. Compilation Error

10. Which of the following statement will result in compilation error?

A. boolean b = 4>3 & 5<2;                  B. -43>>>2;

C. boolean b = 0;                                 D. None of These

11. Which of the following is NOT a unary operator?

A. !                  B. &                 C. +                 D. Both B & C

12. If class Y is a subclass of X, Which of the following statement will return true?

                        X x1 = new Y();

A. x1 != null;                                        B. x1 instanceof Y

C. Both A & B                         D. None of These

13. What will be the output of the following code snippet?

           

            ArrayList al = new ArrayList(2);

            al.set(1, "Hello");

            System.out.println(al);

A. [ , Hello]                              B. [Hello]

C. Compilation Error                D. Run-time Error

14. What will be the output of the following code snippet?

    ArrayList al = new ArrayList();

    al.add("A"); al.add("B"); al.add("C");

    ArrayList al2 = new ArrayList();

    al2.add("Hi");

    System.out.println(al2.add(al));

A. [Hi, [A, B, C]]                                 B. [Hi, A, B, C]

C. true                                                  D. Compilation Error

15. Given:

                        String s = "Hello World";

    Which of the following statement will print "World"?

A. System.out.println(s.substring(6, 11));

B. System.out.println(s.substring(6, 10));

C. System.out.println(s.substring(7, 11));

D. System.out.println(s.substring(6, 10));

16. What will be the output of the following code snippet?

            String s = "This is an island";

            System.out.println(s.lastIndexOf("is"));

A. 11               B. 12                C. 2                 D. None of These

17. Which of the following is FALSE about final keyword?

A. A Final class can not be inherited.

B. A final method can not be overloaded.

C. Value of a final variable can not be changed.

D. None of These

18. What will be the output of the following code snippet?

    StringBuilder b = new StringBuilder("Welcome");

    System.out.println(b.delete(3, 5));

A. Welme                     B. Wele            C. Weme                     D. None of These

19. Which of the following statement will delete the the third element of an ArrayList al containing 5 elements?

A. al.delete(3);                         B. al.remove(3);          

C. al.delete(2);                         D. al.remove(2);

20. What will be the output of the following code:

int i= 5, j=2;

for(  ; i-- > ++j ;  )       

    System.out.println(i+””+j);

A. 43               B. 53                C. 34               D. Compilation Error