Java Quiz

October 6, 2024

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Deprecated: trim(): Passing null to parameter #1 ($string) of type string is deprecated in /home/u797631661/domains/codermantra.com/public_html/wp-includes/formatting.php on line 449

Deprecated: trim(): Passing null to parameter #1 ($string) of type string is deprecated in /home/u797631661/domains/codermantra.com/public_html/wp-includes/formatting.php on line 449

Deprecated: trim(): Passing null to parameter #1 ($string) of type string is deprecated in /home/u797631661/domains/codermantra.com/public_html/wp-includes/formatting.php on line 449

Deprecated: trim(): Passing null to parameter #1 ($string) of type string is deprecated in /home/u797631661/domains/codermantra.com/public_html/wp-includes/formatting.php on line 449

Deprecated: trim(): Passing null to parameter #1 ($string) of type string is deprecated in /home/u797631661/domains/codermantra.com/public_html/wp-includes/formatting.php on line 449

Deprecated: trim(): Passing null to parameter #1 ($string) of type string is deprecated in /home/u797631661/domains/codermantra.com/public_html/wp-includes/formatting.php on line 449

Deprecated: trim(): Passing null to parameter #1 ($string) of type string is deprecated in /home/u797631661/domains/codermantra.com/public_html/wp-includes/formatting.php on line 449

Deprecated: trim(): Passing null to parameter #1 ($string) of type string is deprecated in /home/u797631661/domains/codermantra.com/public_html/wp-includes/formatting.php on line 449

Deprecated: trim(): Passing null to parameter #1 ($string) of type string is deprecated in /home/u797631661/domains/codermantra.com/public_html/wp-includes/formatting.php on line 449

Deprecated: trim(): Passing null to parameter #1 ($string) of type string is deprecated in /home/u797631661/domains/codermantra.com/public_html/wp-includes/formatting.php on line 449

Deprecated: trim(): Passing null to parameter #1 ($string) of type string is deprecated in /home/u797631661/domains/codermantra.com/public_html/wp-includes/formatting.php on line 449

Deprecated: trim(): Passing null to parameter #1 ($string) of type string is deprecated in /home/u797631661/domains/codermantra.com/public_html/wp-includes/formatting.php on line 449

Deprecated: trim(): Passing null to parameter #1 ($string) of type string is deprecated in /home/u797631661/domains/codermantra.com/public_html/wp-includes/formatting.php on line 449

Deprecated: trim(): Passing null to parameter #1 ($string) of type string is deprecated in /home/u797631661/domains/codermantra.com/public_html/wp-includes/formatting.php on line 449

Deprecated: trim(): Passing null to parameter #1 ($string) of type string is deprecated in /home/u797631661/domains/codermantra.com/public_html/wp-includes/formatting.php on line 449

Deprecated: trim(): Passing null to parameter #1 ($string) of type string is deprecated in /home/u797631661/domains/codermantra.com/public_html/wp-includes/formatting.php on line 449

Deprecated: trim(): Passing null to parameter #1 ($string) of type string is deprecated in /home/u797631661/domains/codermantra.com/public_html/wp-includes/formatting.php on line 449

Deprecated: trim(): Passing null to parameter #1 ($string) of type string is deprecated in /home/u797631661/domains/codermantra.com/public_html/wp-includes/formatting.php on line 449

Deprecated: trim(): Passing null to parameter #1 ($string) of type string is deprecated in /home/u797631661/domains/codermantra.com/public_html/wp-includes/formatting.php on line 449

Deprecated: trim(): Passing null to parameter #1 ($string) of type string is deprecated in /home/u797631661/domains/codermantra.com/public_html/wp-includes/formatting.php on line 449

Deprecated: trim(): Passing null to parameter #1 ($string) of type string is deprecated in /home/u797631661/domains/codermantra.com/public_html/wp-includes/formatting.php on line 449

Deprecated: trim(): Passing null to parameter #1 ($string) of type string is deprecated in /home/u797631661/domains/codermantra.com/public_html/wp-includes/formatting.php on line 449

Deprecated: trim(): Passing null to parameter #1 ($string) of type string is deprecated in /home/u797631661/domains/codermantra.com/public_html/wp-includes/formatting.php on line 449

Deprecated: trim(): Passing null to parameter #1 ($string) of type string is deprecated in /home/u797631661/domains/codermantra.com/public_html/wp-includes/formatting.php on line 449

Deprecated: trim(): Passing null to parameter #1 ($string) of type string is deprecated in /home/u797631661/domains/codermantra.com/public_html/wp-includes/formatting.php on line 449

Deprecated: trim(): Passing null to parameter #1 ($string) of type string is deprecated in /home/u797631661/domains/codermantra.com/public_html/wp-includes/formatting.php on line 449

Deprecated: trim(): Passing null to parameter #1 ($string) of type string is deprecated in /home/u797631661/domains/codermantra.com/public_html/wp-includes/formatting.php on line 449

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268

Java Questions

1 / 15

1. What is Truncation in Java?

A. Floating-point value assigned to an integer type

B. Integer value assigned to floating type

C. Floating-point value assigned to a Floating type

D. Integer value assigned to an integer type

2 / 15

2. What does Object Oriented Programming means?

A. Writing a program composed of java classes

B. Writing an algorithm before writing your program and having a test plan

C. Being objective about what you develop

D. Desigining the application based on the objects discovered when analysing the problem

3 / 15

3. What is garbage collection in the context of Java?

A. The JVM checks the output of any Java program and deletes anything that doesn’t make sense

B. Any package imported in a program and not used is automatically deleted.

C. When all references to an object are gone the memory used by the object is not reclaimed.

D. When all references to an object are gone, the memory used by the object is automatically reclaimed.

4 / 15

4. What will be the output of the following Java program?

        class String_demo 

        {

            public static void main(String args[])

            {

                int ascii[] = { 65, 66, 67, 68};

                String s = new String(ascii, 1, 3);

                System.out.println(s);

            }

       }

A. ABC

B. BCD

C. CDA

D. ABCD

5 / 15

5. Which data type value is returned by all transcendental math functions?

A. int

B. float

C. double

D. long

6 / 15

6. In Iterator, hasMoreElements() method of Enumeration has been changed to:

A. hasNextElement()

B. isNext()

C. hasNext()

D. name remains same

7 / 15

7. Which mechanism is used when a thread is paused running in its critical section and another thread is allowed to enter (or lock) in the same critical section to be executed?

A. Inter-thread communication

B. Initial-thread communication

C. Mutual Exclusive

D. none of the above

8 / 15

8. Which of these method of Object class can clone an object?

A. Objectcopy()

B. copy()

C. Object clone()

D. clone()

9 / 15

9. Find the output of the following code.

        class array_output 

        {

            public static void main(String args[]) 

            {

                int array_variable [] = new int[10];

    	    for (int i = 0; i < 10; ++i) 

                {

                    array_variable[i] = i;

                    System.out.print(array_variable[i] + " ");

                    i++;

                }

            } 

        }

A. 0 2 4 6 8

B. 1 3 5 7 9

C. 0 1 2 3 4 5 6 7 8 9

D. 1 2 3 4 5 6 7 8 9 10

10 / 15

10. What will be the output of the following Java program?

        class recursion 
        {
            int func (int n) 
            {
                int result;
                if (n == 1)
                    return 1;
                result = func (n - 1);
                return result;
            }
        } 
        class Output 
        {
            public static void main(String args[]) 
            {
                recursion obj = new recursion() ;
                System.out.print(obj.func(5));
            }
        }

A. 1

B. 120

C. O

D. None of the mentioned

11 / 15

11. What will be the output of the following Java code?

    class San

    {

     public void m1 (int i,float f)

     {

      System.out.println(" int float method");

     }

     

     public void m1(float f,int i);

      {

      System.out.println("float int method");

      }

     

      public static void main(String[]args)

      {

        San s=new San();

            s.m1(20,20);

      }

    }

A. int float method

B. float int method

C. compile time error

D. run time error

12 / 15

12. What will be the output of the following Java code?

        class output 

        {

            public static void main(String args[])

            {

                 String chars[] = {"a", "b", "c", "a", "c"};

                 for (int i = 0; i < chars.length; ++i)

                     for (int j = i + 1; j < chars.length; ++j)

                         if(chars[i].compareTo(chars[j]) == 0)

                             System.out.print(chars[j]); 

            }

       }

A. ab

B. bc

C. ca

D. ac

13 / 15

13. What is not the use of “this” keyword in Java?

A. Referring to the instance variable when a local variable has the same name

B. Passing itself to the method of the same class

C. Passing itself to another method

D. Calling another constructor in constructor chaining

14 / 15

14. Find the output of the following program.

public class Solution{
       public static void main(String[] args){
                     short x = 10;
                     x =  x * 5;
                     System.out.print(x);
       }
}

A. Compilation error

B. 50

C. 10

D. Exception

15 / 15

15. Which of the below is not a Java Profiler?

A. Jprofiler

B. Eclipse Profiler

C. JVM

D. Jconsole

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