问题

以下是翻译好的内容：

所以我现在正在上Java课程，我们应该编写一个使用ArrayIndexOutOfBoundsException的程序。很简单，对吧？但出于某种原因，我得到了以下错误：

"错误：不兼容的类型：无法将ArrayIndexOutOfBoundsException转换为Throwable"

import java.util.*; //用于异常处理

class ArrayIndexOutOfBoundsException {
public static void main(String[] args) {
int[] array = fillArray(); //填充数组，包含100个值
int userInput = getInput();
try {
  System.out.print("元素 " + userInput + " 的值是 " + array[userInput]);
}
catch (ArrayIndexOutOfBoundsException ex) {
  System.out.print("超出边界");
}
}//结束main

public static int[] fillArray(){ //填充数组的函数
int[] array = new int[100];
for (int i = 0; i < 100; i++) {
  array[i] = (int)(Math.random() * 100) + 1;
}
return array;
}//结束fillArray

public static int getInput(){ //确保用户输入正确值的函数
System.out.print("请输入要查找相应值的索引：");
Scanner input = new Scanner(System.in); //用于输入
int userInput = 0;
try {
  userInput = input.nextInt();
}
catch (InputMismatchException ex) {
  System.out.println("\n不是有效的数字\n请重试"); 
  return getInput();
}
return userInput;
} //结束getInput

}//结束类

这是我运行的代码，在 "catch (ArrayIndexOutOfBoundsException ex) {" 处发生错误。

然而，如果我将其更改为IndexOutOfBoundsException，代码将按预期工作，我真的找不出为什么。我的意思是，它应用于数组，所以ArrayIndexOutOfBoundsException不适用吗？至少根据我尝试在Google中搜索问题所得到的信息是这样的...但显然我还遗漏了其他内容。

我在Repl.it上运行它，我不认为这会有什么影响，但谁知道呢？

另外，对于格式不佳的代码，我道歉。由于某种原因，当我复制粘贴它时，格式会变得混乱，所以这是我能够在合理的时间内修复以使其可读的最佳方式。

无论如何，任何帮助/建议/甚至是指引我朝着正确方向的提示都将不胜感激！谢谢！

<details>
<summary>英文:</summary>

so I&#39;m in a Java class right now and we&#39;re supposed to write a program using ArrayIndexOutOfBoundsExceptions. Simple enough, right? Well for whatever reason I&#39;m getting the error:

&quot;error: incompatible types: ArrayIndexOutOfBoundsException cannot be converted to Throwable&quot;


    import java.util.*; //for exceptions
    
    class ArrayIndexOutOfBoundsException {
    public static void main(String[]args){
    int[] array = fillArray(); //filling the array with 100 values
    int userInput = getInput();
    try{
      System.out.print(&quot;The value of element &quot;+userInput+&quot; is &quot;+array[userInput]);
    }
    catch (ArrayIndexOutOfBoundsException ex) {
      System.out.print(&quot;Out of Bounds&quot;);
    }
    }//end main
    
    public static int[] fillArray(){ //function to fill the array
    int[] array = new int[100];
    for (int i = 0; i&lt;100;i++)
    {
      array[i] = (int)(Math.random() *100) + 1;
    }
    return array;
    }//end fillArray
    
    public static int getInput(){ //function to make sure the user enters a proper value
    System.out.print(&quot;Please enter the index value to find the corresponding value at that location: &quot;);
    Scanner input = new Scanner(System.in); //for input
    int userInput = 0;
    try{
      userInput = input.nextInt();
    }
    catch(InputMismatchException ex){
      System.out.println(&quot;\nNot a valid number\nPlease Try Again&quot;); 
      return getInput();
    }
    return userInput;
    } //end getInput
    
    }//end class

This is the code I&#39;m running, with the error occurring at the &quot;catch (ArrayIndexOutOfBoundsException ex) {&quot;. 

However, if I switch that to just an IndexOutOfBoundsException the code works as intended and I cannot for the life of my figure out why. I mean, it&#39;s being applied to an Array so shouldn&#39;t an ArrayIndexOutOfBoundsException apply? At least that&#39;s what I&#39;ve been able to find trying to google the problem...but clearly there is something else I&#39;m missing.

I&#39;m running it on Repl.it, I don&#39;t think that would make a difference, but never know?

Also, I apologize for the poorly formatted code, for whatever reason when I copy and paste it, it get&#39;s all messed up so this was the best I was able to fix it to make it readable in a reasonable amount of time.

Anyways, any help/advice/so much as pointing me in the right direction would be appreciated! Thank you!

</details>


# 答案1
**得分**: 1

更改你的类名，它就会起作用。这是最佳解决方案，因为它可以阻止对java.lang.ArrayIndexOutOfBoundsException的掩盖：

```java
class ArrayIndexOutOfBoundsExceptionTest {
  public static void main(String[] args) {
    int[] array = fillArray(); // 填充数组，包含100个值
    int userInput = getInput();
    try {
      System.out.print("元素 " + userInput + " 的值是 " + array[userInput]);
    } catch (ArrayIndexOutOfBoundsException ex) {
      System.out.print("越界");
    }
  } // 结束 main

为了完整和演示的目的，在这里我没有重新命名类，而是使用了异常的完整路径名（java.lang）：

class ArrayIndexOutOfBoundsException {
  public static void main(String[] args) {
    int[] array = fillArray(); // 填充数组，包含100个值
    int userInput = getInput();
    try {
      System.out.print("元素 " + userInput + " 的值是 " + array[userInput]);
    } catch (java.lang.ArrayIndexOutOfBoundsException ex) {
      System.out.print("越界");
    }
  } // 结束 main

class ArrayIndexOutOfBoundsExceptionTest {
public static void main(String[]args){
int[] array = fillArray(); //filling the array with 100 values
int userInput = getInput();
try{
System.out.print("The value of element "+userInput+" is "+array[userInput]);
}
catch (ArrayIndexOutOfBoundsException ex) {
System.out.print("Out of Bounds");
}
}//end main

class ArrayIndexOutOfBoundsException { 
public static void main(String[]args){
int[] array = fillArray(); //filling the array with 100 values
int userInput = getInput();
try{
System.out.print("The value of element "+userInput+" is "+array[userInput]);
}
catch (java.lang.ArrayIndexOutOfBoundsException ex) {
System.out.print("Out of Bounds");
}
}//end main

答案2

得分: -1

你的实现存在几个问题。

1. 已经存在一个名为 ArrayIndexOutOfBoundsException 的类。
2. 你会在文档中看到该类的层次结构包括 Throwable，而你的类没有包含这一点。

因此，你的类需要扩展 IndexOutOfBoundsException 或 Throwable 类。