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I think the if/else can be even more simple like:
static boolean flag = true;
static int B,H;
static { Scanner input = new Scanner(System.in);
B = input.nextInt(); H = input.nextInt();
if (B > 0 && H > 0) { flag = true;
} else {
System.out.print("java.lang.Exception: Breadth and height must be positive");
}
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Java Static Initializer Block
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I think the if/else can be even more simple like: static boolean flag = true; static int B,H; static { Scanner input = new Scanner(System.in); B = input.nextInt(); H = input.nextInt(); if (B > 0 && H > 0) { flag = true; } else { System.out.print("java.lang.Exception: Breadth and height must be positive"); }