怎么用java二分查找数组具有相同的元素

要使用Java进行二分查找数组中具有相同元素的方法，首先需要确保数组已经按照升序或降序的方式排序。然后，可以使用以下代码来实现二分查找：

public class BinarySearch {public static void main(String[] args) {int[] nums = {1, 2, 3, 3, 4, 5, 6};int target = 3;int left = binarySearchLeft(nums, target);int right = binarySearchRight(nums, target);if (left == -1 || right == -1) {System.out.println("No elements found.");} else {for (int i = left; i <= right; i++) {System.out.println("Element found at index: " + i);}}}public static int binarySearchLeft(int[] nums, int target) {int left = 0;int right = nums.length - 1;int index = -1;while (left <= right) {int mid = left + (right - left) / 2;if (nums[mid] == target) {index = mid;right = mid - 1;} else if (nums[mid] < target) {left = mid + 1;} else {right = mid - 1;}}return index;}public static int binarySearchRight(int[] nums, int target) {int left = 0;int right = nums.length - 1;int index = -1;while (left <= right) {int mid = left + (right - left) / 2;if (nums[mid] == target) {index = mid;left = mid + 1;} else if (nums[mid] < target) {left = mid + 1;} else {right = mid - 1;}}return index;}}

在这个例子中，我们定义了两个辅助函数binarySearchLeft和binarySearchRight来查找数组中具有相同元素的左右边界。然后在main方法中调用这两个函数，并打印出所有满足条件的元素的索引。

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