java consumer_Java8---Consumer

最新推荐文章于 2022-07-27 15:30:56 发布

孙硕星

最新推荐文章于 2022-07-27 15:30:56 发布

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文章标签： java consumer

本文链接：https://blog.youkuaiyun.com/weixin_42352351/article/details/114185516

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该博客主要展示了Java中Consumer接口的使用。定义了Person类，在Test类的main方法里，通过lambda表达式和普通方式创建Consumer对象，重写accept和andThen方法，对Person对象列表进行筛选和处理，还结合Predicate接口移除不符合条件的元素。

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package com.an.java8.comsumer;

/**

* @description:

* @author: anpeiyong

* @date: Created in 2020/3/3 15:59

* @since:

public class Person {

private Integer age;

private String name;

public Person(Integer age, String name) {

this.age = age;

this.name = name;

}

public Integer getAge() {

return age;

}

public void setAge(Integer age) {

this.age = age;

}

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

@Override

public String toString() {

return "age:"+age+"==name:"+name;

}

package com.an.java8.comsumer;

import org.jetbrains.annotations.NotNull;

import java.util.ArrayList;

import java.util.List;

import java.util.function.Consumer;

import java.util.function.Function;

import java.util.function.Predicate;

import java.util.function.Supplier;

import java.util.stream.Stream;

/**

* @description:

* @author: anpeiyong

* @date: Created in 2020/3/2 12:12

* @since:

public class Test {

public static void main(String[] args) {

// Function

// Supplier

// Consumer

// Predicate

// Stream.of().forEach();

/**

* lambda表达式提供简单的方式创建对象；

* lambda表达式的目标类型必须是函数是接口

Consumer consumer1 = x -> {

};

Consumer consumer=new Consumer() {

@Override

public void accept(Person person) {

}

@NotNull

@Override

public Consumer andThen(@NotNull Consumer super Person> after) {

return null;

}

};

// testAccept();

testAndThen();

}

public static void testAccept(){

List personList=new ArrayList<>();

//lambda实现

//创建Consumer对象，并重写 accept()

Consumer consumer= person->{

if (person.getName().equalsIgnoreCase("lili")){

personList.add(person);

}

};

//普通方式实现

Consumer consumer1=new Consumer() {

@Override

public void accept(Person person) {

if (person.getName().equalsIgnoreCase("lisi")){

personList.add(person);

}

};

Stream.of(new Person(12,"lili"),new Person(12,"lisi"),new Person(12,"zhangsan")).forEach(consumer);

Stream.of(new Person(12,"lili"),new Person(12,"lisi"),new Person(12,"zhangsan")).forEach(consumer1);

System.out.println(personList);

}

public static void testAndThen(){

List personList=new ArrayList<>();

//lambda实现

Consumer consumer= person->{

if (person.getName().equalsIgnoreCase("lili")){

personList.add(person);

}

};

//创建Consumer对象，并重写 andThen()

consumer=consumer.andThen(person -> {

//创建Predicate对象，并重写 test()

personList.removeIf(person1 -> person1.getAge() != 12);

// personList.removeIf(new Predicate() {

// @Override

// public boolean test(Person person) {

// return person.getAge() != 12;

// }

// });

});

Stream.of(new Person(12,"lili"),new Person(12,"lisi"),new Person(12,"zhangsan")).forEach(consumer);

System.out.println(personList);

}