java字符串按字符逆转和按单词逆转

字符串的处理，经常在各类考试中用到，在网上搜索了下这方面的资料却很少，于是翻了下文档自己做了两个小demo.

1.将字符串按单个字符逆转代码:

package javastring;public class CharReverse {public String wordReverse(String str){int n=str.length();char []chars=new char[n];str.getChars(0, n, chars, 0);//获得了char[]可操作的数组.int length=chars.length;StringBuffer sbStr=new StringBuffer();for(int i=0;i<length;i++){sbStr.append(chars[length-i-1]+"");//用StringBuffer将其逆转.}return sbStr.toString();//转换为String}public static void main(String args[]){CharReverse cr=new CharReverse();String str="I really love you!";System.out.println("Before reverse:"+str);String str2=cr.wordReverse(str);//仅静态调动非静态要用对象.声明System.out.println("After reverse:"+str2);}}

?2.将字符串按单词逆转代码：

package javastring;public class WordReverse {public String wordReverse(String str){String stringArray[]=str.split(" ");//获得按word划分String可操作数组.StringBuffer sbStr=new StringBuffer();int length=stringArray.length;for(int i=0;i<length;i++){sbStr.append(stringArray[length-i-1]+" ");//用StringBuffer将其逆转.}return sbStr.toString();//转换为String.}public static void main(String args[]){WordReverse wr=new WordReverse();String str="So that is true.";System.out.println("Before word reverse:"+str);String str2=wr.wordReverse(str);System.out.println("Before word reverse:"+str2);}}

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