Static initialization blocks - Hacker Rank Solution.

Static initialization blocks are executed when the class is loaded, and you can initialize static variables in those blocks.

You are given a class Solution with a main method. Complete the given code so that it outputs the area of a parallelogram with breadth  and height . You should read the variables from the standard input.

If  or  , the output should be "java.lang.Exception: Breadth and height must be positive" without quotes.

Input Format

There are two lines of input. The first line contains : the breadth of the parallelogram. The next line contains : the height of the parallelogram.

Output Format

If both values are greater than zero, then the main method must output the area of the parallelogram. Otherwise, print "java.lang.Exception: Breadth and height must be positive" without quotes.

Sample input 1

1
3

Sample output 1

3

Sample input 2

-1
2

Sample output 2

java.lang.Exception: Breadth and height must be positive

SOLUTION: -

import java.util.Scanner;
public class Solution {
    static int B, H;
    static boolean flag;
    static {
        Scanner sc = new Scanner(System.in);
        B = sc.nextInt();
        H = sc.nextInt();
        if (B > 0 && H > 0) {
            flag = true;
        } else {
            flag = false;
            System.out.println("java.lang.Exception: Breadth and height must be positive");
        }
    }
    public static void main(String[] args) {
        if (flag) {
            int area = B * H;
            System.out.println(area);
        }
    }
}

How It Works:
B and H are static variables for breadth and height.
The static block runs once when the class is loaded, even before main().
Input is read inside the static block using a Scanner.
If the values are valid, flag is set to true, and the area is calculated in main().
If not, an exception message is printed directly from the static block.