嵌套while循环迭代

Question

巢式while循环发生问题，导致以下问题：线程“主”中的异常java.lang.ArrayIndexOutOfBoundsException：Chatbot.main中为2（Chatbot.java:25）我不太确定是什么引起了ArrayIndexOutOfBoundsException。这样做的部分要求是，我不允许使用while循环以外的任何其他形式的循环。也不能使用任何continue，break等任何见解将不胜感激。尼克下面的代码：import javax.swing.JOptionPane;public class Chatbot {public static void main(String[] args) {    String[] topics;    int numTopics = Integer.parseInt(JOptionPane.showInputDialog("How many topics would you like to talk about?"));    while (numTopics < 1) {        numTopics = Integer.parseInt(JOptionPane.showInputDialog("Error! Please enter a positive number of topics!"));    }    int i = 0;    topics = new String[numTopics];    while (i < topics.length) {        topics[i] = JOptionPane.showInputDialog("Please enter topic " + i);        while (topics[i].contains("?")) {            topics[i] = JOptionPane.showInputDialog("I'll ask the questions here, Please enter topic " + i);        }        i = i + 1;    }    String dialog1 = JOptionPane.showInputDialog("Tell me more about " + topics[numTopics]); }}

Answer 1

更改topics[numTopics]到topics[numTopics-1]你的最后一行的代码，因为指数在0阵列启动

String dialog1 = JOptionPane.showInputDialog("Tell me more about " + topics[numTopics-1]);