Java的String中的subString()方法，stringsubstring

Java的String中的subString()方法，stringsubstring

方法如下：

public String substring(int beginIndex, int endIndex)第一个int为开始的索引，对应String数字中的开始位置，第二个是截止的索引位置，对应String中的结束位置1、取得的字符串长度为：endIndex - beginIndex;2、从beginIndex开始取，到endIndex结束，从0开始数，其中不包括endIndex位置的字符如："hamburger".substring(4, 8) returns "urge" "smiles".substring(1, 5) returns "mile"取长度大于等于3的字符串a的后三个子字符串，只需a.subString(a.length()-3, a.length()); 手册中的具体说明如下：substringpublic String substring(int beginIndex, int endIndex)Returns a new string that is a substring of this string. The substring begins at the specified beginIndex and extends to the character at index endIndex - 1. Thus the length of the substring is endIndex-beginIndex. Examples:   "hamburger".substring(4, 8) returns "urge" "smiles".substring(1, 5) returns "mile" Parameters:beginIndex - the beginning index, inclusive.endIndex - the ending index, exclusive. Returns:the specified substring. Throws: IndexOutOfBoundsException - if the beginIndex is negative, or endIndex is larger than the length of this String object, or beginIndex is larger than endIndex.