#1
Which of the following is a primitive data type in Java?
Integer
ExplanationInteger is a primitive data type in Java.
#2
What is the result of 9 % 4 in Java?
1
ExplanationThe modulo operator (%) returns the remainder after division.
#3
What is the default value of a boolean variable in Java?
false
ExplanationBoolean variables default to 'false' in Java.
#4
What does the 'static' keyword mean in Java?
It indicates a method or variable that belongs to the class itself, rather than instances of the class
ExplanationStatic keyword in Java indicates class-level entities.
#5
What is the output of the following code?
public class Main {
public static void main(String[] args) {
int x = 5;
System.out.println(x++);
}
}
5
ExplanationThe post-increment operator prints the current value of x, then increments it.
#6
What is the purpose of the 'break' statement in Java?
To terminate a loop or switch statement
ExplanationThe 'break' statement exits the loop or switch statement.
#7
What is a Java interface?
A collection of abstract methods
ExplanationJava interface defines a contract for implementing classes.
#8
What is the purpose of the 'finally' block in Java exception handling?
To execute code after try-catch blocks, regardless of whether an exception occurs or not
Explanation'finally' block is always executed, providing a mechanism for cleanup.
#9
What is the difference between '==', 'equals()', and 'compareTo()' methods in Java?
'==' compares object references, 'equals()' compares object contents, 'compareTo()' compares values of comparable objects
Explanation'==' checks object identity, 'equals()' checks object equality, 'compareTo()' compares objects for sorting.