定义一个集合，并添加一些整数1，2，3，4，5，6，7，8，9，10，过滤奇数，只留下偶数，并将结果保存起来。

package MyStream;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.stream.Collectors;
import java.util.stream.Stream;

public class Test1 {
    public static void main(String[] args) {
        ArrayList<Integer> list=new ArrayList<>();
        Collections.addAll(list,1,2,3,4,5,6,7,8,9,10);
       List<Integer> newList = list.stream()
        .filter(n->n%2==0).collect(Collectors.toList());
        System.out.println(newList);
    }
}

创建一个ArrayList集合并添加以下字符，字符串中前面是姓名，后面是年龄，“zhangsan,23”,"lisi,24","wagwu,25"，保留年龄大于等于24岁的人，并将结果收集到Map集合当中，姓名为键，年龄为值。

package MyStream;
import java.util.ArrayList;
import java.util.Map;
import java.util.function.Function;
import java.util.stream.Collectors;

public class Test2 {
    public static void main(String[] args) {
        ArrayList<String> list=new ArrayList<>();
        list.add("zhangsan,23");
        list.add("lisi,24");
        list.add("wangwu,25");
    /*    list.stream().filter(s->Integer.parseInt(s.split(",")[1])>=24)
                .collect(Collectors.toMap(new Function<String, String>() {
                    @Override
                    public String apply(String s) {
                        return s.split(",")[0];
                    }
                }, new Function<String, Integer>() {
                    @Override
                    public Integer apply(String s) {
                        return Integer.parseInt(s.split(",")[1]);
                    }
                }));*/
Map<String,Integer> map=list.stream().filter(s->Integer.parseInt(s.split(",")[1])>=24)
                .collect(Collectors.toMap(
                       s->s.split(",")[0] ,
                      s->Integer.parseInt(s.split(",")[1])));
        System.out.println(map);
    }
}

package MyStream;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.function.Function;
import java.util.stream.Collectors;
import java.util.stream.Stream;
public class Test3 {
    public static void main(String[] args) {
        ArrayList<String> manList=new ArrayList<>() ;
        ArrayList<String> womenList=new ArrayList<>() ;
        Collections.addAll(manList,"蔡坤坤，24","叶齁咸,23","刘不甜,22","吴签,24","谷嘉,30","肖梁梁,27");
        Collections.addAll(womenList,"赵小颖,35","杨颖,36","高元元,43","张天天,31","刘诗,35","杨小幂,33");
       Stream<String> stream1 = manList.stream().filter(s -> s.split(",")[0].length() == 3)
                .limit(2);

        Stream<String> stream2 = womenList.stream().filter(s -> s.split(",")[0].startsWith("杨"))
                .skip(1);

/*Stream.concat(stream1,stream2).map(new Function<String,Actor>() {
    @Override
    public Actor apply(String s) {
        String name=s.split(",")[0];
        int age=Integer.parseInt(s.split(",")[1]);
        return new Actor(name,age);
    }
}).forEach(s-> System.out.println(s));*/
     List<Actor> list=   Stream.concat(stream1,stream2).map(s->
        new Actor(s.split(",")[0],Integer.parseInt(s.split(",")[1]))
        ).collect(Collectors.toList());
        System.out.println(list);
    }
}