Java Lambda Expressions

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    import java.io.*;
    import java.util.*;
    import java.math.BigInteger;
    
    interface PerformOperation {
     boolean check(int a);
    }
    class MyMath {
     public static boolean checker(PerformOperation p, int num) {
      return p.check(num);
     }
        
        public PerformOperation isOdd() {
            return number -> number % 2 != 0;
        }
        
        public PerformOperation isPrime() {
            return number ->  BigInteger.valueOf(number).isProbablePrime(1);
        }
        
        public PerformOperation isPalindrome() {
            return number -> {
                String possiblePalindrome = String.valueOf(number);
                int j = possiblePalindrome.length() - 1;
                for (int i = 0; i < possiblePalindrome.length() / 2; i++) {
                    if (possiblePalindrome.charAt(i) != possiblePalindrome.charAt(j)) {
                        return false;
                    }
                    j--;
                }
                return true;
            };
        }
        
        
    }
    
    public class Solution {
    
     public static void main(String[] args) throws IOException {
      MyMath ob = new MyMath();
      BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
      int T = Integer.parseInt(br.readLine());
      PerformOperation op;
      boolean ret = false;
      String ans = null;
      while (T--> 0) {
       String s = br.readLine().trim();
       StringTokenizer st = new StringTokenizer(s);
       int ch = Integer.parseInt(st.nextToken());
       int num = Integer.parseInt(st.nextToken());
       if (ch == 1) {
        op = ob.isOdd();
        ret = ob.checker(op, num);
        ans = (ret) ? "ODD" : "EVEN";
       } else if (ch == 2) {
        op = ob.isPrime();
        ret = ob.checker(op, num);
        ans = (ret) ? "PRIME" : "COMPOSITE";
       } else if (ch == 3) {
        op = ob.isPalindrome();
        ret = ob.checker(op, num);
        ans = (ret) ? "PALINDROME" : "NOT PALINDROME";
    
       }
       System.out.println(ans);
      }
     }
    }