黑马程序员-JavaAPI-17天-2(Collections-binarySearch)
package string.test; import java.util.ArrayList; import java.util.Collections; import java.util.List; /* ------- android培训、java培训、期待与您交流! ---------- * 类 Collections * binarySearch使用二分搜索法搜索指定列表,以获得指定对象 */ public class CollectionsDemo2 { public static void main(String[] args) { List<String> lists = new ArrayList<String>(); lists.add("adfgdfgsdf"); lists.add("dssdsdfs"); lists.add("bsdfsdf"); lists.add("zwewsdf"); System.out.println(lists); // 返回负数代表不存在 int index = Collections.binarySearch(lists, "zhangsan"); System.out.println(index); } }