在java的单个数组中查找字符串故障

public class StringSearch {
    public static int searchString(String[] array, String target) {
        for (int i = 0; i < array.length; i++) {
            if (array[i] instanceof String) {
                if (array[i].equals(target)) {
                    return i; // 返回匹配字符串的索引位置
                }
            }
        }
        return -1; // 未找到匹配字符串，返回-1
    }

    public static void main(String[] args) {
        String[] array = {"apple", "banana", "orange", "grape"};
        String target = "orange";
        int index = searchString(array, target);
        if (index != -1) {
            System.out.println("找到目标字符串，索引位置为：" + index);
        } else {
            System.out.println("未找到目标字符串。");
        }
    }
}