this is the easy solution without making more method in the class mymath //**************** import java.io.; import java.util.;

public class Solution {

public static void main(String[] args) throws IOException {
    MyMath ob = new MyMath();
    Scanner br = new Scanner(System.in);
    int T = Integer.parseInt(br.nextLine());
    PerformOperation op;
    boolean ret = false;
    String ans = null;
    while (T--> 0) {
        String s = br.nextLine().trim();
        String[] st = s.split("\\s");
        int ch = Integer.parseInt(st[0]);
        int num = Integer.parseInt(st[1]);
        if (ch == 1) {
            op = (a) -> {return a % 2 != 0;};
            ret = ob.checker(op, num);
            ans = (ret) ? "ODD" : "EVEN";
        } else if (ch == 2) {
            op = (a) -> {
                    if (a < 2) {
                        return false;
                    } else if (a == 2) {
                        return true;
                    } else if (a % 2 == 0) {
                        return false;
                    }
                    int sqrt = (int) Math.sqrt(a);
                    for (int i = 3; i <= sqrt; i += 2) {
                        if (a % i == 0) {
                            return false;
                        }
                    }
                    return true;
                    };
            ret = ob.checker(op, num);
            ans = (ret) ? "PRIME" : "COMPOSITE";
        } else if (ch == 3) {
            op = a -> {
                    String str = String.valueOf(a);
                    int start = 0;
                    int end = str.length() - 1;
                    while (start < end) {
                        if (str.charAt(start) != str.charAt(end)) {
                            return false;
                        }
                        start++;
                        end--;
                    }
                    return true;
                };
            ret = ob.checker(op, num);
            ans = (ret) ? "PALINDROME" : "NOT PALINDROME";

        }
        System.out.println(ans);
    }
    br.close();
}

}

@FunctionalInterface interface PerformOperation { boolean check(int a); } class MyMath { public boolean checker(PerformOperation p, int num) { return p.check(num); } }

`