Java OCA OCP Practice Question 2631

Question

What is the result of the following class? 

import java.util.function.*; 
public class Main { 
   int age; //from   w  w w .j a  va 2  s .c  om
   public static void main(String[] args) { 
      Main p1 = new Main(); 
      p1.age = 1; 
      check(p1, p -> p.age < 5);  // h1 
   } 
   private static void check(Main m, Predicate<Main> pred) { // h2 
      String result = pred.test(m) ? "match": "not match";  // h3 
      System.out.print(result); 
   } 
}
  • A. match
  • B. not match
  • C. Compiler error on line h1.
  • D. Compiler error on line h2.
  • E. Compile error on line h3.
  • F. A runtime exception is thrown.


A.

Note

This code compiles and runs without issue so C, D, E, and F are incorrect.

Line h1 creates a lambda expression that checks if the age is less than 5.

Since there is only one parameter and it does not specify a type, the parentheses around the type parameter are optional.

Line h2 uses the Predicate interface, which declares a test() method.

Since test() returns true on the expression, match is output and A is correct.




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