java lambda List 查找 anyMatch() allMatch() noneMatch()-526互联

package lambda.list;

import cn.hutool.core.util.ObjectUtil;
import lombok.extern.slf4j.Slf4j;
import org.junit.Test;
import pojo.Dome;

import java.util.ArrayList;
import java.util.List;

/**
 * @Author: xxx
 * @date 2021/5/14
 **/
@Slf4j
public class SearchTest {

    /***
     * 初始化测试数组
     * @date 2021/5/14
     **/

    private List<Dome> initArray() {
        Dome dome1 = new Dome("张三", 11.0, 10);
        Dome dome2 = new Dome("李四", 61.0, 11);
        Dome dome3 = new Dome("王五", 26.0, 12);
        Dome dome4 = new Dome("张三", 14.0, 14);
        Dome dome5 = new Dome("王五", 24.0, 15);
        Dome dome6 = new Dome("李四", 16.0, 16);
        Dome dome7 = new Dome("赵六", 35.0, 17);

        List<Dome> domes = new ArrayList<>();

        domes.add(dome1);
        domes.add(dome2);
        domes.add(dome3);
        domes.add(dome4);
        domes.add(dome5);
        domes.add(dome6);
        domes.add(dome7);

        log.info("domes : {}", domes);

        return domes;
    }

    /***
     * List 查找
     * @date 2021/5/13
     **/

    @Test
    public void searchTest1() {
        List<Dome> domes = initArray();
/*
1.Matching
Stream提供了anyMatch(), allMatch(), noneMatch()这三种match方式
 anyMatch(Predicate p) 传入一个断言型函数，对流中所有的元素进行判断，
只要有一个满足条件就返回true，都不满足返回false。
*/
        boolean b = domes.stream().anyMatch(vo -> ObjectUtil.isNotNull(vo.getName()) && "赵六".equals(vo.getName()));
        log.info("b : {}", b);

/*
domes : [Dome{name='张三', money=11.0, age=10}, Dome{name='李四', money=61.0, age=11}, Dome{name='王五', money=26.0, age=12}, Dome{name='张三', money=14.0, age=14}, Dome{name='王五', money=24.0, age=15}, Dome{name='李四', money=16.0, age=16}, Dome{name='赵六', money=35.0, age=17}]
b : true
*/
    }

    /**
     *  判断集合中的元素是否满足条件
     */
    @Test
    public void searchTest2(){
        List<Dome> domes = initArray();
        //并行流parallelStream
        domes.parallelStream().forEach(element -> System.out.println("element = " + element));
        // 打印线程  -Djava.util.concurrent.ForkJoinPool.common.parallelism=N 虚拟机启动参数来设置worker(N)的数量
        domes.parallelStream().forEach(element -> System.out.println(Thread.currentThread().getName() + " >>> " + element));

        //只要有一个条件满足即返回true
        boolean isValid = domes.stream().anyMatch(element -> element.getName().contains("张三"));
        System.out.println("isValid = " + isValid);
        //必须全部都满足才会返回true
        boolean isValidOne = domes.stream().allMatch(element -> element.getName().contains("张三"));
        System.out.println("isValidOne = " + isValidOne);
        //全都不满足才会返回true
        boolean isValidTwo = domes.stream().noneMatch(element -> element.getName().contains("张三"));
        System.out.println("isValidTwo = " + isValidTwo);
    }
}