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Java Interview Questions on Variables - 16

Question: 1

public class CppBuzz {
public static void main(String[] args){
 int a = 10;
 System.out.println(a++*a++);
}
}

(A) 100
(B) 110
(C) 121
(D) 144

Level: Beginner Category of MCQ: variables

Question: 2

public class CppBuzz {
public static void main(String[] args){
 int a = 10;
 System.out.println(a--*a--);
}
}

(A) 100
(B) 90
(C) 99
(D) 72

Level: Beginner Category of MCQ: variables

Question: 3

Select Odd one out from these about local variables

(A) Local variables are declared in methods, constructors, or blocks
(B) Local variables are created when the method, constructor or block is entered
(C) the variable will be destroyed once it exits the method, constructor, or block
(D) We can't create reference variables of Local variables

Level: Beginner Category of MCQ: variables

Question: 4

Java is case sensitive langauge

(A) True
(B) False

Level: Beginner Category of MCQ: variables

Question: 5

public class CppBuzz {

public static void main(String args[]) {
       
       int a =10;
       String b = "10";
      
       System.out.println(a+b);
      
    }
}

(A) 10"10"
(B) Compilation Error
(C) 20
(D) 1010

Level: Practitioner Category of MCQ: variables

Question: 6

public class CppBuzz {

public static void main(String args[]) {
       
       int a =10;
       String b = "10";
      
       System.out.println(a-b);
      
    }
}

(A) 10-10
(B) 0
(C) 1010
(D) Compilation Error

Level: Practitioner Category of MCQ: variables

Question: 7

public class CppBuzz {

public static void main(String args[]) {
       
       int a =10;
       String b = "10";
      
       System.out.println(b+a);
      
    }
}

(A) 10+10
(B) 1010
(C) Compilation Error
(D) Undefined

Level: Practitioner Category of MCQ: variables

Question: 8

public class CppBuzz {

public static void main(String args[]) {
       
       int a =10;
       String b = "-10";
      
       System.out.println(a+b);
      
    }
}

(A) 0
(B) 10"-10"
(C) 10-10
(D) Compilation Error

Level: Expert Category of MCQ: variables

Question: 9

public class CppBuzz {

public static void main(String args[]) {
       
       int a =10;
       String b = "10+10";
      
       System.out.println(a+b);
      
    }
}

(A) 30
(B) 1020
(C) 10+10+10
(D) 1010+10

Level: Expert Category of MCQ: variables

Question: 10

What is default value of variable a in following code?

public class Main
{
private int a;

public static void main(String[] args) {
    Main obj = new Main();
	System.out.println(obj.a);
}
}

(A) Garbage Value
(B) Code has compilation error
(C) null
(D) 0

Level: Beginner Category of MCQ: variables

Question: 11

What should be value of variable a?
 public class Main
{
public static void main(String[] args) {
    int a;
    System.out.println(a);
}
}

(A) Garbage Value
(B) 0
(C) Undefind
(D) Compilation Error

Level: Beginner Category of MCQ: variables

Question: 12

public class Main
{

public static void main(String[] args) {
    final int a = 5;
    a = 10;
    System.out.println(a);
}

}

(A) 5
(B) 10
(C) Error: Can't assign a value to final variable a
(D) None of the above

Level: Beginner Category of MCQ: variables

Question: 13

public class Main
{
public static void main(String[] args) {
    final int a;
    a = 10;
    System.out.println(a);
}
}

(A) 0
(B) 10
(C) Undefind
(D) Error: Can't modify final variable a

Level: Beginner Category of MCQ: variables

Question: 14

public class Main
{
public static void main(String[] args) {
    final int a;
    a = 5;
    a = 10;
    System.out.println(a);
}
}

(A) 5
(B) 10
(C) 0
(D) Error: variable a might already have been assigned

Level: Beginner Category of MCQ: variables

Question: 15

Find the output of below program:

public class Main
{
    public static int a;

    public Main(){
        a=10;
    }
    
   public static void main(String[] args) {
       System.out.println(a);	
   }
}

(A) 10
(B) Compilation Error
(C) Undefind
(D) 0

Level: Practitioner Category of MCQ: variables

Question: 16

Note: final static variables can't be modified once initialized and can be accessed outside of the class without creating object. Here is an example :-

public class JavaExample{
   public final static int DELAY = 5;
}

public class Main
{
public static void main(String[] args) {
    System.out.println(JavaExample.DELAY);
}
}

Level: Beginner Category of MCQ: variables

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Java Interview Questions on Variables - 16

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