Java8 Lambda测试

1，使用函数式接口

@FunctionalInterfacepublic interface TestLambda8 {void apply(String n);}

2 测试类

public class A {public static void main(String[] args) {A instanceA=new A();// Java 8之后：List<String> features = Arrays.asList("zjq", "111");features.forEach((n) ->A.b(n));features.forEach((n) ->instanceA.a(n));System.out.println();features.forEach(instanceA::a);features.forEach(A::b);System.out.println();//lambda会自动进行参数匹配//TestLambda8这个接口只能有一个方法，下面的方法引用会匹配这个接口中的唯一方法,这就是@FunctionalInterface函数接口TestLambda8 testLambda88=s -> System.out.println(s+7);testLambda88.apply("testLambda88");System.out.println();TestLambda8 testLambda89=A::b;testLambda89.apply("testLambda89");System.out.println();TestLambda8 testLambda810=instanceA::a;testLambda810.apply("testLambda810");x((TestLambda8)(A::b));x((A::b));//但是下面句代码报错//(TestLambda8)(A::b).apply("xx");     }public   void  a(String n) {System.out.println(n+"a()");}public   void  a(String n,String s) {System.out.println();}public static   void  b(String n) {System.out.println(n+":b()");}private static void x(TestLambda8 testLambda8) {testLambda8.apply("method x");}}

3 运行结果

运行结果: