Java_8 New - Functional Interfaces

import java.util.Arrays;
import java.util.List;
import java.util.function.Predicate;

publicclassJava8Tester{
publicstaticvoid main(String args[]){

List<Integer> list =Arrays.asList(1,2,3,4,5,6,7,8,9);

// Predicate<Integer> predicate = n -> true
// n is passed as parameter to test method of Predicate interface
// test method will always return true no matter what value n has.
System.out.println("Print all numbers:");
//pass n as parameter
eval(list, n->true);

// Predicate<Integer> predicate1 = n -> n%2 == 0
// n is passed as parameter to test method of Predicate interface
// test method will return true if n%2 comes to be zero
System.out.println("Print even numbers:");
eval(list, n-> n%2==0);

// Predicate<Integer> predicate2 = n -> n > 3
// n is passed as parameter to test method of Predicate interface
// test method will return true if n is greater than 3.
System.out.println("Print numbers greater than 3:");
eval(list, n-> n >3);
}

publicstaticvoideval(List<Integer> list,Predicate<Integer> predicate){
for(Integer n: list){
if(predicate.test(n)){
System.out.println(n +" ");
}
}
}
}

C:\JAVA>javac Java8Tester.java

C:\JAVA>java Java8Tester

Print all numbers:
1
2
3
4
5
6
7
8
9
Print even numbers:
2
4

6
8
Print numbers greater than 3:
4
5
6
7
8
9