java runtime_error ai_generated true

java.lang.StringIndexOutOfBoundsException: 字符串索引超出范围: 10

java.lang.StringIndexOutOfBoundsException: String index out of range: 10

ID: java/string-index-out-of-bounds-exception

其他格式: JSON · Markdown 中文 · English
88%修复率
83%置信度
1证据数
2023-12-01首次发现

版本兼容性

版本状态引入弃用备注
Java 8 active — — —
Java 11 active — — —
Java 17 active — — —
Java 21 active — — —

根因分析

尝试使用负数或大于等于字符串长度的索引访问字符串中的字符，通常由差一错误或格式错误的输入引起。

English

An attempt to access a character in a String using an index that is negative or greater than or equal to the string length, often due to off-by-one errors or malformed input.

generic

官方文档

https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/StringIndexOutOfBoundsException.html

解决方案

  1. Check the string length before accessing: if (index >= 0 && index < str.length()) { char c = str.charAt(index); } else { /* handle error */ }
  2. Use str.substring(start, end) with bounds checking, or use str.charAt(Math.min(index, str.length()-1)) as a temporary clamp.

无效尝试

常见但无效的做法:

  1. 70% 失败

    This hides the bug and may cause downstream issues like null pointer exceptions or incorrect data processing.

  2. 85% 失败

    This does not address the root cause of incorrect index calculation; the index may still be out of range for other inputs.