时间: 2004-9-08 23:16:27 标题: |
| | 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。
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重构了一下，下面是重构后的代码和执行结果：
| java代码: | 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] |
|
|
| |
|
学习了一下，决定下次遇到这样回答
| java代码: | 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();
}
} |
| java代码: | StringReverser reverser = new StringReverser("this is a test String");
String reversString = reverser.reverse();
|
时间: 2004-9-13 13:59:35 标题: |
| | 呵呵，只是各人编程序风格不同，思路其实都差不多。
换了我，会把 tokenizer 挪到 reverse()里面去，因为 tokenizer只有在 reverse()里才被用到，封在method里它的作用域比封装在class中就更小了。 |
// -----------------------------------------------------------------------------
// StringReverseWord.java
// -----------------------------------------------------------------------------
import java.util.*;
/**
* -----------------------------------------------------------------------------
* Used to provide an example of how to reverse all words in a given string.
* -----------------------------------------------------------------------------
*/
public class StringReverseWord {
private static void doStringReverseWord() {
String a = "Alex Michael Hunter";
Stack stack = new Stack();
StringTokenizer tempStringTokenizer = new StringTokenizer(a);
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());
System.out.print(" ");
}
System.out.println("/n");
}
/**
* 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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