java Arrays.binarySearch找不到目标

Question

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"Name"。为什么我不能"Name"进入阵列？任何想法？

Answer 1

为了使用binarySearch，您需要先对数组进行排序：

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

java.util.Arrays.sort(sortedArray);

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