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关于StringTokenizer的疑惑

mefaint

发贴: 245
积分: 60

于 2003-12-11 10:52

近日用StringTokenizer的时候发现了一个以前没有注意的问题，就是分隔符不能使用多个字符？
比如说：


String s = "aa||bb||cc||dd||ee";
String delim = "||";
java.util.StringTokenizer tok = new java.util.StringTokenizer(s, delim);
while (tok.hasMoreTokens()) {
  System.out.println(tok.nextToken());
}

结果是对的，但如果原字符串变成"aa||bb||cc||d|d||ee"，输出结果就变成了


aa
bb
cc
d
d
ee

难道说StringTokenizer的设计思想就是这样？
不解。。

作者	Re:关于StringTokenizer的疑惑 [Re:mefaint]
ditty 负资产小资 CJSDN高级会员发贴: 1038 积分: 143	于 2003-12-11 11:02 我的j2sdk 1.42_02没有问题，怀疑是JDK版本的问题。内忧外患的时代，洗心革面，阿咪豆腐~

作者

Re:关于StringTokenizer的疑惑 [Re:mefaint]

Ispy

发贴: 0
积分: 0

于 2003-12-11 11:30

delim好象只认一个字符
我的也是j2sdk 1.42_02啊！


import java.util.*;
public class Test {
  public static void main(String[] args){
  String s = "aa>bb>cc>d>d>>ee";
  String delim = ">>";
  StringTokenizer tok = new StringTokenizer(s,">>",true);
  while (tok.hasMoreTokens()) {  
      System.out.println(tok.nextToken());
  }
  StringTokenizer st = new StringTokenizer("this is a test");
       while (st.hasMoreTokens()) {
         System.out.println(st.nextToken());

    }
  }
}

作者	Re:关于StringTokenizer的疑惑 [Re:mefaint]
Ispy 发贴: 0 积分: 0	于 2003-12-11 11:31 结果 aa > bb > cc > d > d > > ee this is a test

作者	Re:关于StringTokenizer的疑惑 [Re:mefaint]
mefaint 发贴: 245 积分: 60	于 2003-12-11 11:34 问题已解决参见 http://www.cjsdn.com/post/view?bid=1&id=70171&sty=1&tpg=1&age=0 linux_china的解释

作者	Re:关于StringTokenizer的疑惑 [Re:mefaint]
floater Java Jedi 总版主发贴: 3233 积分: 421	于 2003-12-11 11:35 please don't post more than once. "Any fool can write code that a computer can understand. Good programmers write code that humans can understand." - Martin Fowler, Refactoring - Improving the Design of Existing Code

作者	Re:关于StringTokenizer的疑惑 [Re:mefaint]
mefaint 发贴: 245 积分: 60	于 2003-12-11 11:38 斑竹不要生气，刚才发帖的时候网络比较慢，我又比较心急。。。一时多点了几下。。。我已经让“烂泥”帮我删了。

作者	Re:关于StringTokenizer的疑惑 [Re:mefaint]
floater Java Jedi 总版主发贴: 3233 积分: 421	于 2003-12-11 11:57 It's ok, just a kindly reminder, since it happens several times recently. "Any fool can write code that a computer can understand. Good programmers write code that humans can understand." - Martin Fowler, Refactoring - Improving the Design of Existing Code

作者

Re:关于StringTokenizer的疑惑 [Re:mefaint]

jsmile

Life is good

发贴: 127
积分: 52

于 2003-12-11 12:19

From The Java Language Specification:

21.10.2 public StringTokenizer(String str, String delim)

This constructor initializes a newly created StringTokenizer so that it will recognize tokens within the given string str. All characters in the string delim will be considered delimiters. Delimiter characters themselves will not be treated as tokens.

http://java.sun.com/docs/books/jls/first_edition/html/javautil.doc10.html#7648

So if String s = "aa||bb||cc||d|d||ee";
String delim = "abcde";
StringTokenizer tok = new StringTokenizer(s, delim);
Only "||" and "|" returned.
if tok = new StringTokenizer(s, delim, true);
Everything is returned because delimiter characters themselves are treated as tokens.

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