浅谈Java的String中的subString()方法
投稿:jingxian
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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