java Arrays.binarySearch无法找到目标 [英] java Arrays.binarySearch fails to find target

问题描述

String[] sortedArray = new String[]{"Quality", "Name", "Testing", "Package"};   

// Search for the word "cat" 
int index = Arrays.binarySearch(sortedArray, "Quality");  

我总是得到 -3 。问题出在名称中。为什么我的数组中不能有Name？有什么想法？

I always get -3. Problem is in "Name". Why I can not have "Name" in my array? Any idea?

推荐答案

为了使用 binarySearch ，你需要首先对数组进行排序：

In order to use binarySearch, you will need to sort the array yourself first:

String[] sortedArray = new String[]{"Quality", "Name", "Testing", "Package"};   

java.util.Arrays.sort(sortedArray);

int index = Arrays.binarySearch(sortedArray, "Quality");  

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