stream流的案例

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

public class stream案例1 {
    public static void main(String[] args) {
        ArrayList<Integer> list=new ArrayList<>();
        Collections.addAll(list,1,2,3);
        List<Integer> collect = list.stream().filter(s -> s % 2 == 0)
                .collect(Collectors.toList());
        System.out.println(collect);
    }
}

ArrayList<String> LIST=new ArrayList<>();
Collections.addAll(LIST,"张三,25","李四,24","朝气,26");
Map<String, Integer> collect = LIST.stream().filter(s -> Integer.parseInt(s.split(",")[1]) >= 25)
        .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]);
            }
        }));
System.out.println(collect);