【JDK1.8】Java 8源码阅读汇总

public class NewFeaturesTest {
    /**
     * output:
     * 所有的数: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
     * 偶数: 0, 2, 4, 6, 8,
     * 大于5的数: 6, 7, 8, 9,
     */
    public static void main(String args[]){
        List<Integer> list = Arrays.asList(0, 1, 2, 3, 4, 5, 6, 7, 8, 9);
        System.out.print("所有的数: ");
        eval(list, n -> true);
        System.out.print("\n偶数: ");
        eval(list, n-> n%2 == 0 );
        System.out.print("\n大于5的数: ");
        eval(list, n -> n > 5 ); 
    }

    private static void eval(List<Integer> list, Predicate<Integer> predicate) {
        list.stream().filter( n -> predicate.test(n)).forEach(System.out::println);
    }
}