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发表时间：2004-09-07
嘿嘿, 看来还是偶的答案最完美
Readonly 写道 java reverse string 然后第2个link里面就有答案: Reverse string (by words) http://www.idevelopment.info/data/Programming/java/strings/StringReverseWord.java 满分, hoho. p.s, tnnd, 竟然在这里讨论技术......, 踢飞到技术区 |
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发表时间：2004-09-07
Original string: Alex,Michael Hunter
Reverse word string: Hunter Alex,Michael 这个程序和gigix的本质是一样的，不能给满分！ |
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发表时间：2004-09-07
正则表达式的\b表示的是word boundary,可堪此任。
假定要求执行效率最高的代码呢，。。。 题外话：昨天经人介绍了一个叫swig的东西（swig.sourceforge.net），用来将C/C++代码移植到python,ruby,perl,java,lisp等中。对于java也应该是对JNI的包装吧。试了python的还不错。 |
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发表时间：2004-09-08
综合了一下，最好的实现
public class StringReverseWord {
private static void doStringReverseWord(); {
String SEPARATORS = " ,\t:'';?";
String a = "Alex Michael,Hu'nter?kk";
Stack stack = new Stack();;
StringTokenizer tempStringTokenizer = new StringTokenizer(a,SEPARATORS,true);;
while (tempStringTokenizer.hasMoreTokens();); {
stack.push(tempStringTokenizer.nextElement(););;
}
System.out.println("\nOriginal string: " + a);;
System.out.print("Reverse word string: ");;
while(!stack.empty();); {
System.out.print(stack.pop(););;
}
}
/**
* Sole entry point to the class and application.
* @param args Array of String arguments.
*/
public static void main(String[] args); {
doStringReverseWord();;
}
}
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发表时间：2004-09-08
to 凤舞凰扬:
没有夸张，如果用你的办法，逗号之类的间隔符号虽然被去掉了，却没有象庄表伟要求的那样被打印出来； to sankxuan: 用了StringTokenizer(a,SEPARATORS,true)的三参数的构造函数，漂亮，确实是最好的实现。 ------------------------------------------------------ 重构了一下，下面是重构后的代码和执行结果：
import java.util.StringTokenizer;
public class Test{
public static final String SEPARATORS = " ,\t:'';?!";
public static String reverse(String input);{
StringTokenizer st = new StringTokenizer(input, SEPARATORS, true);;
StringBuffer words = new StringBuffer("");;
while (st.hasMoreTokens();); {
words.insert( 0, st.nextToken(); );;
}
return words.toString();;
}
public void testReverse();{
String[] sentences = new String[]{
"Hello, world!",
"I am a student",
"Am I a student? yes, or no",
"Am I a student ? yes , or no",
"Zhuang says:'It's just a coding game.'"
};
for (int i = 0; i < sentences.length; i++);
System.out.println("Sentence[" + i + "]=[" + sentences[i]+"], " +
"After reversed: [" + Test.reverse(sentences[i]);+"]");;
}
public static void main(String[] args);{
new Test();.testReverse();;
}
}
-------------------------------------------------------------------------- 执行结果： 引用 >ant exec
Buildfile: build.xml exec: [java] Sentence[0]=[Hello, world!], After reversed: [!world ,Hello] [java] Sentence[1]=[I am a student], After reversed: [student a am I] [java] Sentence[2]=[Am I a student? yes, or no], After reversed: [no or ,yes ?student a I Am] [java] Sentence[3]=[Am I a student ? yes , or no], After reversed: [no or , yes ? student a I Am] [java] Sentence[4]=[Zhuang says:'It's just a coding game.'], After reversed: ['game. coding a just s'It':says Zhuang] |
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发表时间：2004-09-08
Very Good.
结帖。 |
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发表时间：2004-09-09
不好意思续一下貂
org.apache.commons.lang.StringUtils public static String[] split(String source,String trim) |
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发表时间：2004-09-09
to sevenbamboos:
无论是java.util.String 中的split() ， 还是org.apache.commons.lang.StringUtils 的 public static String[] split(String source,String trim)，虽然功能很强大，但都没有提供 StringTokenizer 中三参数的构造函数功能，这个构造函数解释如下： public StringTokenizer(String str, String delim, boolean returnDelims) If the returnDelims flag is true, then the delimiter characters are also returned as tokens. Each delimiter is returned as a string of length one. If the flag is false, the delimiter characters are skipped and only serve as separators between tokens. 但这个题目要求的恰好是“delimiter characters are also returned as tokens”； |
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发表时间：2004-09-10
StringTokenizer , 强~
正则表达式的\b是零字符匹配 |
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发表时间：2004-09-12
学习了一下，决定下次遇到这样回答
import java.util.StringTokenizer;
public final class StringReverser {
public final static String DEFAULT_DELI = " ,\t:'';?!";
public final static boolean DEFAULT_INCLUDE_DELT = true;
private StringTokenizer tokenizer = null;
public StringReverser(String source); {
this(source,DEFAULT_DELI,DEFAULT_INCLUDE_DELT);;
}
public StringReverser(String source,String delimiters); {
this(source,delimiters,DEFAULT_INCLUDE_DELT);;
}
public StringReverser(String source,String delimiters,boolean includeDelimiter); {
tokenizer = new StringTokenizer(source,delimiters,includeDelimiter);;
}
public String reverse(); {
StringBuffer result = new StringBuffer();;
while(tokenizer.hasMoreTokens(); ); {
result.insert(0,tokenizer.nextToken(); );;
}
return result.toString();;
}
}
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