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| package Stream_Case_package; | |
| import java.util.ArrayList; | |
| import java.util.Collections; | |
| import java.util.List; | |
| import java.util.stream.Collectors; | |
| public class Case_demo1 { | |
| public static void main(String[] args) { | |
| /* | |
| 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 | |
| */ | |
| //1、定义一个集合 | |
| ArrayList<Integer> list = new ArrayList<>(); | |
| //2、添加一些整数 | |
| Collections.addAll(list, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10); | |
| System.out.println(list); | |
| //3、过滤奇数,只留下偶数 | |
| //进行判断,如果是偶数,返回true 保留 | |
| List<Integer> list1 = list.stream() | |
| .filter(n -> n % 2 == 0) | |
| .collect(Collectors.toList()); | |
| //4、打印集合 | |
| System.out.println(list1); | |
| } | |
| } | |