anyMatch和allMatch以及noneMatch的区别

一.方法的介绍:

boolean anyMatch(Predicate predicate)
只要有一个条件满足即返回true

boolean allMatch(Predicate predicate)
必须全部都满足才会返回true

boolean noneMatch(Predicate predicate)
全都不满足才会返回true

二.demo演示:

目的: 过滤集合中的元素,过滤条件是一个集合中的多个元素

1.创建一个实体类:

 public class User {

    private String name;
    private String phone;
    public User(String name, String phone) {
        this.name = name;
        this.phone = phone;
    }
    public User() {
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }  
    public String getPhone() {
        return phone;
    }
    public void setPhone(String phone) {
        this.phone = phone;
    }
    @Override
    public String toString() {
        return "User{" +
                "name='" + name + '\'' +
                ", phone='" + phone + '\'' +
                '}';
    }
}

2.数据的填充和测试:

public class TestStream {
    public static void main(String[] args) {
    
        User user = new User("李","1223123123");
        User user1 = new User("哈哈","412412412");
        User user2 = new User("haha","231231");
        User user3 = new User("李","4241241241");
	   /**
	    * 需要过滤的源数据
	    */
        List list =  new ArrayList();
        list.add(user);
        list.add(user1);
        list.add(user2);
        list.add(user3);
        System.out.println(list.size());
        /**
        * 过滤条件
        * 只要名字是haha或者李的对象集合
        */
        List userList = new ArrayList();
        userList.add(new User("haha","2131231"));
        userList.add(new User("李","231231"));
        System.out.println(userList.size());
        
        List result = list.stream().filter(users -> userList.stream().anyMatch(user5 -> user5.getName().equals(users.getName()))).collect(Collectors.toList());
        System.out.println(result.size());
        result.forEach( aa ->{
            System.out.println("姓名: "+aa.getName()+"，手机号: "+aa.getPhone());
        });
    }
}

3.测试结果:

4.补充:
获取集合中名字是"李"的所有对象

List a = list.stream().filter(user4 -> user4.getName().equals("李")).collect(Collectors.toList());
//遍历list集合
a.forEach(System.out::println);

心得:
    最近通过研究java8的流式集合,发现非常的实用和节约代码的编写时间,建议搭建有时间多学习多用。