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String[] split(String regex)
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String b = new String("30:20");
String[] ss = b.split(":");//ûÎÊÌâ
String s = new String("30+2");
String[] ss = s.split("\\+");
String[] strs = "java.lang.String".split("\\.");
//strs[2] = "String"
// µÚ¶þÖÖ·½·¨£º
String source = "java.lang.String";
int idx = source.lastIndexOf(".");
String str = source.substring(idx);
// str = "String"


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    public static void main(String args[]) {
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