Lambad case

LambdaTest.java

package com.haxianhe;

import static com.haxianhe.ClassA.test;

import java.util.function.Predicate;

/**
 * @author haxianhe <haxianhe@gmail.com>
 * Created on 2021-12-27
 */
public class LambdaTest {
    public static void main(String[] args) {
        boolean bool = (new ClassB()).set(test(i -> i == null || "".equals(i)), "").test();
        System.out.println("result: "+bool);
    }
}

@FunctionalInterface
interface ClassA<T> {
    static <T> ClassA<T> test(Predicate<T> predicate) {
        return predicate::test;
    }

    boolean isEmpty(T param);
}

class ClassB<T> {
    private ClassA classA;
    private T param;

    ClassB<T> ClassB(ClassA classA, T param) {
        this.classA = classA;
        this.param = param;
        return this;
    }

    ClassB<T> set(ClassA classA, T param) {
        this.classA = classA;
        this.param = param;
        return this;
    }

    public boolean test() {
        return classA.isEmpty(param);
    }
}