一、limit()
List list = Arrays.asList(1,2,3,4,5,6,6,7,7,8,8,9,9);
List resultLimit = list.stream().limit(5).collect(Collectors.toList());
System.out.println(resultLimit);
二、skip() 跳过元素
List list = Arrays.asList(1,2,3,4,5,6,6,7,7,8,8,9,9);
//skip跳过元素
List resultSk = list.stream().skip(5).collect(Collectors.toList());
System.out.println(resultSk);
三、去除List中重复得Integer
List list = Arrays.asList(1,2,3,4,5,6,6,7,7,8,8);
result = list.Stream().distinct().collect(toList());
System.out.println(result);
四、去除List中重复的String
List uniqueStr = list.stream().distinct().collect(Collectors.toList());
五、所有的元素都乘2 i->i*2
//所有的元素都乘2 i->i*2
List list = Arrays.asList(1,2,3,4,5,6,6,7,7,8,8,9,9);
List result = list.stream().map(i -> i*2).collect(Collectors.toList());
System.out.println(result);
六、遍历
public static List userlist() {
List list = Arrays.asList(
new User("猫",2,"中华田园猫","橘黄色"),
new User("狗",2,"泰迪","卷毛")
);
return list;
}
userlist().stream().map(user -> user.getName()).forEach(System.out::println);
userlist().stream().map(user -> user).forEach(System.out::println);
List lists = userlist().stream().map(user -> user.getAge()).collect(Collectors.toList());
System.out.println(lists);
//猫 狗 2 2