Java 8 IntPredicate Interface

9 months ago codedestine 0

In this tutorial, we will learn about Java 8 IntPredicate interface.

Java 8 IntPredicate Interface

IntPredicate Interface :-

IntPredicate ( java.util.function.IntPredicate ) is a functional interface that has one abstract method and three default method declared in it. This interface is a specialised form of Predicate interface.

Abstract method :- 

boolean  test ( int  value ) :- The abstract method test ( int value ) is a functional method. It accepts one int value as an argument and return boolean value. It represents a conditional operation, where a passed int value is tested against a specific int value to give a boolean ( True or False ) result.

Default method :-  

  1. default  IntPredicate<T>  and ( IntPredicate <? super T > other ) :- It returns an intpredicate that represents short circuiting logical AND of this intpredicate ( intpredicate on which method is called ) and another ( passed as an argument ).
  2. default IntPredicate<T>  or ( IntPredicate <? super T > other ) :- It returns an intpredicate that represents short circuiting logical OR of this intpredicate ( intpredicate on which method is called ) and another ( passed as an argument ).
  3. default IntPredicate<T>  negate (  ) :- It returns an intpredicate that represents logical negation of this intpredicate ( intpredicate on which method is called ).

Reference :-  IntPredicate Interface JavaDocs 

Example – 1 :- 

This example will show you, how to create and call different methods of a intpredicate interface.

  public static void main(String[] args){
 
    IntPredicate intPredicate1 = ( x ) -> { if( x == 8 ){ return true;
                                            }else{ return false; }};
    // Example of test method
    boolean result = intPredicate1.test(8);
    System.out.println(result);
 
    // Example of negate method
    boolean result3 = (intPredicate1.negate()).test(8);
    System.out.println(result3);
 
    IntPredicate intPredicate2 = ( x ) -> { if( x == 9 ){ return true;
                                            }else{ return false; }};
 
    // Example of and method
    boolean result1 = intPredicate1.and(intPredicate2).test(8);
    System.out.println(result1);
 
    // Example of or method
    boolean result2 = intPredicate1.or(intPredicate2).test(8);
    System.out.println(result2);
 
  }   

Result :- 

true
false
false
true 

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