class OddNum_Exp {
              public static void main(String x[]) {
                int a =4;
                checknum(a);
                a =5;
                checknum(a);
              }
            
              public static void checknum(int a) {
                try {
                  checkEvenNum(a);
                  System.out.println(a + " is even.");
                } catch (IllegalArgumentException e) {
                 System.out.println("Exception :" + e.getMessage());
                }
              }
            
              public static void checkEvenNum(int b) {
                if (b % 2 != 0) {
                  throw new IllegalArgumentException(b + " is odd.");
                }
              }
            }