day1_java basics

What is the default value of a boolean variable in Java?

• true
  

• false
  

• 0
  

• null
  

Which of the following is not a Java keyword?

• static

• Boolean

• void

• private

What is the size of an int in Java?

• 8

• 16

• 32

• 64

Which method is the entry point of a Java program?

• start()

• run()

• main()
  

• init()
  

Which of these data types is used to store a single character?

• string
  
  
  

• text

• character

• char

What will be the output of this code?
int x = 5;

System.out.println(x++);

• 6
  

• 
  5
  

• 
  Compilation Error
  

• 
  Runtime Error
  

Which of the following statements about the do-while loop in Java is true?

• A) The condition is checked before the loop body executes.
  

• 
  B) The loop may never execute if the condition is false.
  

• 
  C) The loop body executes at least once, even if the condition is false.
  

• 
  D) The do-while loop cannot use a boolean condition.

Which package must be imported to use the Scanner class in Java?

• A) java.io.*
  

• B) java.util.*
  

• C) java.lang.*
  

• D) java.scanner.*

What will be the output of the following code if the user enters 25?

import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
int num = sc.nextInt();
System.out.println("You entered: " + num);
}
}

• You entered: num
  

• 
  B) You entered: 25
  

• 
  C) You entered: sc
  

• D) Compilation Error

What will be the output of the following code?

int x = 10;
if (x > 10)
System.out.println("Greater");
else if (x == 10)
System.out.println("Equal"); else System.out.println("Smaller");

• A) Greater
  

• 
  B) Equal
  

• 
  C) Smaller
  

• 
  D) No output