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private static Scanner scan = new Scanner(System.in);
private static boolean flag = false;
private static int B = scan.nextInt();
private static int H = scan.nextInt();
static{
flag = (B>0 && H>0);
if(!flag)
{System.out.print("java.lang.Exception: Breadth and height must be positive");}
}
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Java Static Initializer Block
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A shorter approach
private static Scanner scan = new Scanner(System.in); private static boolean flag = false; private static int B = scan.nextInt(); private static int H = scan.nextInt();
static{
}