下面是分别用split函数和StringTokenizer类来实现字符串分割的简单代码：
●利用split函数：
●利用split函数：
- String s = new String("2_8_7_4_3_9_1");
- String[] arr = s.split("_");
●利用StringTokenizer类：
- String s = new String("2_8_7_4_3_9_1");
- StringTokenizer commaToker = new StringTokenizer(s, "_");
- String[] arr = new String[commaToker.countTokens()];
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