JAVA8 BiFunction接口用于解耦

先看源码

@FunctionalInterface
public interface BiFunction {

    
    R apply(T t, U u);

    
    default  BiFunction andThen(Function after) {
        Objects.requireNonNull(after);
        return (T t, U u) -> after.apply(apply(t, u));
    }
}

apply()方法例子：

@Slf4j
public class BiFunctionTest {

    public static void main(String[] args) {
        test((processId, status) -> {
            log.info(">>>>>>>main");
            int result = Integer.parseInt(processId) + status;
            return result;
        });
    }

    private static void test(BiFunction callback) {
        log.info(">>>>>>>test");
        Integer apply = callback.apply("1", 2);
        log.info(">>>>>>>{}", apply);
    }
}

打印结果：

21:25:34.650 [main] INFO com.ceam.data.tree.common.function.bifunction.BiFunctionTest - >>>>>>>test
21:25:34.652 [main] INFO com.ceam.data.tree.common.function.bifunction.BiFunctionTest - >>>>>>>main
21:25:34.652 [main] INFO com.ceam.data.tree.common.function.bifunction.BiFunctionTest - >>>>>>>3

总结：

    可以把一个大的方法分割为两个，或者把模块分割降低耦合，两者还是存在依赖的。