java.lang.StringIndexOutOfBoundsException: String index out of range: -1

小鱼儿 2023-09-30 13:39 22阅读 0赞

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字符串截取下标越界

  1. java.lang.StringIndexOutOfBoundsException: String index out of range: -1
  2.     at java.lang.String.substring(String.java:1967)

出错代码

  1. result.put("value", valueBuilder.toString().substring(0,valueBuilder.toString().length()-1));
修改后代码
  1. if (StringUtils.isNotBlank(valueBuilder.toString()) && valueBuilder.toString().length() >0){
  3.                             result.put("value", valueBuilder.toString().substring(0,valueBuilder.toString().length()-1));
  4.                         }
总结

StringIndexOutOfBoundsException 异常源码如下：

  1. /**
  2.  * Thrown by {@code String} methods to indicate that an index
  3.  * is either negative or greater than the size of the string.  For
  4.  * some methods such as the charAt method, this exception also is
  5.  * thrown when the index is equal to the size of the string.
  6.  */
  7. public
  8. class StringIndexOutOfBoundsException extends IndexOutOfBoundsException {
  10.     private static final long serialVersionUID = -6762910422159637258L;
  12.     /**
  13.      * Constructs a {@code StringIndexOutOfBoundsException} with no
  14.      * detail message.
  15.      *
  16.      * @since   JDK1.0.
  17.      */
  18.     public StringIndexOutOfBoundsException() {
  20.         super();
  21.     }
  23.     /**
  24.      * Constructs a {@code StringIndexOutOfBoundsException} with
  25.      * the specified detail message.
  26.      *
  27.      * @param   s   the detail message.
  28.      */
  29.     public StringIndexOutOfBoundsException(String s) {
  31.         super(s);
  32.     }
  34.     /**
  35.      * Constructs a new {@code StringIndexOutOfBoundsException}
  36.      * class with an argument indicating the illegal index.
  37.      *
  38.      * @param   index   the illegal index.
  39.      */
  40.     public StringIndexOutOfBoundsException(int index) {
  42.         super("String index out of range: " + index);
  43.     }
  44. }

总共有以下几个方法会抛出该异常：

  1. String.substring()
  3. String.charAt()
  5. String.codePointAt()
  7. String.codePointBefore()
  9. String.subSequence()
  11. String.getChars()
  13. String.getBytes()

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