如何使用java实现二分查找算法

public class BinarySearch {
    public static int binarySearch(int[] arr, int target) {
        int left = 0;
        int right = arr.length - 1;
        
        while (left <= right) {
            int mid = (left + right) / 2;
            
            if (arr[mid] == target) {
                return mid;
            } else if (arr[mid] < target) {
                left = mid + 1;
            } else {
                right = mid - 1;
            }
        }
        
        return -1; //表示未找到目标元素
    }
}

public class Main {
    public static void main(String[] args) {
        int[] arr = {2, 4, 6, 8, 10, 12, 14, 16, 18, 20}; //已排序数组
        int target = 12; //要查找的目标元素
        int index = BinarySearch.binarySearch(arr, target);
        
        if (index != -1) {
            System.out.println("目标元素在数组中的位置为：" + index);
        } else {
            System.out.println("未找到目标元素");
        }
    }
}