浅谈Java的String中的subString()方法
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:
substring
public 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
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