java - 测试 BiConsumer 时出现编译错误

Question

我在下面写了接受 BiConsumer<Object, Object> 的方法，当我传递方法的方法引用时 testBiConsumer(String a, String b)我收到一个编译错误:

Multiple markers at this line
    - The method biConsumerTest(String, String, BiConsumer<Object,Object>) in the type Test is not applicable for the arguments (String, String, 
     Test::testBiConsumer)
    - The type Test does not define testBiConsumer(Object, Object) that is applicable here

如果我将 BiConsumer 从 BiConsumer<Object, Object> 更改为至 BiConsumer<String , String >它工作得很好。

如何使下面的代码工作？我要public static void biConsumerTest(String a, String b, BiConsumer<String, String> biConsumer)通用。

public class Test {
        public static void main(String[] args){
            Test.biConsumerTest("A", "B", Test::testBiConsumer);
        }

        public static void biConsumerTest(String a, String b, BiConsumer<Object, Object> biConsumer){
            biConsumer.accept(a, b);
        }

        public static void testBiConsumer(String a, String b) {
            System.out.println(a);
            System.out.println(b);
        }
    }

Answer 1

代码看起来有点滑稽，不清楚你实际上要实现什么，但要使其通用:

public class Test {
    public static void main(String[] args) {
        Test.biConsumerTest("A", "B", Test::testBiConsumer);
    }

    public static <T> void biConsumerTest(T a, T b, BiConsumer<T, T> biConsumer) {
        biConsumer.accept(a, b);
    }

    public static <S> void testBiConsumer(S a, S b) {
        System.out.println(a);
        System.out.println(b);
    }
}