1，使用函数式接口
@FunctionalInterface public 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:
