Interview questions on java 8 Predicate Functional Interface for experienced.

  Part 2

Interview questions on Java 8 Predicate Functional Interface for experienced covered in this post:

    What are the default methods defined in Predicate functional interface?

-          There are 3 default methods declared inside Predicate functional interface.

1.       Negate(): negate() returns the logical negation of existing result.

package simplifiedjava.crackedInterview.java8; import java.util.Arrays; import java.util.List; import java.util.function.Predicate;  public class PredicateDefaultMethodDemo {        public static void main(String[] args) {             List<String> list = Arrays.asList("Yogesh","Arpita","Shweta","Shruti","Ananya","Asmita","Yogita");              Predicate<String> p1 =  s -> s.startsWith("S");             Predicate<String> p3 =  p1.negate();              for(String s : list) {                   if(p1.test(s)) {                         System.out.println(s);                   }             }       } }

 

2.       And(): And() works like logical && just combine two conditions.

package simplifiedjava.crackedInterview.java8;  import java.util.Arrays; import java.util.List; import java.util.function.Predicate;  public class PredicateDefaultMethodDemo {        public static void main(String[] args) {         List<Integer> list = Arrays.asList(10,20,30,40,50,60,70,80,90,100);             Predicate<Integer> p1 =  n -> n > 50;             Predicate<Integer> p2 =  n -> n < 100;                        Predicate<Integer> p3 =  p1.and(p2);              for(Integer s : list) {                   if(p3.test(s)) {                         System.out.println(s);                   }             }       } } Output: 60 70 80 90

  

3.       Or(): Or() works like logical || just combine tow conditions. 

package simplifiedjava.crackedInterview.java8;  import java.util.Arrays; import java.util.List; import java.util.function.Predicate;  public class PredicateDefaultMethodDemo {        public static void main(String[] args) {             List<String> list = Arrays.asList("Yogesh","Arpita","Shweta","Shruti","Ananya","Asmita","Yogita");              Predicate<String> p1 =  s -> s.startsWith("S");             Predicate<String> p2 =  s -> s.startsWith("Y");              Predicate<String> p3 =  p1.negate();             Predicate<String> p4 =  p1.or(p2);              for(String s : list) {                   if(p4.test(s)) {                         System.out.println(s);                   }             }       }     } Output: Yogesh Shweta Shruti Yogita

 

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    What are the static methods defined in Predicate functional interface?

-          Predicate has defined isEqual () static method inside it.

-          Please refer to the below example for syntax.

package simplifiedjava.crackedInterview.java8;  import java.util.function.Predicate;  public class PredicateStaticMethodDemo {        public static void main(String[] args) {             Predicate<String> p = Predicate.isEqual("Java");             System.out.println(p.test("java"));             System.out.println(p.test("Java"));             System.out.println(p.test("Databse"));       } } Output: false true false

    

    Wap to implement Predicate interface?

package simplifiedjava.crackedInterview.java8;  import java.util.ArrayList; import java.util.List; import java.util.function.Predicate;  public class FindPositiveOrNegativeNoUsingPredicate {        public static void main(String[] args) {                        List<Integer> list = new ArrayList<Integer>();             list.add(-10);             list.add(20);             list.add(30);              Predicate<Integer> p = no -> no > 0;                        for(Integer i : list) {                   if(p.test(i)) {                         System.out.println("Positive Number");                   }else {                         System.out.println("Negative Number");                   }             }       } } Output: Negative Number Positive Number Positive Number

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Upcoming questions in next post:

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