单词扭转，字符逆转

package com.mall.common;

public class Method {
    
    public static void main(String args[]){
        String str1="I am a student!";
        System.out.println("原字符串：");
        System.out.println(str1);
        String str2=reverse(str1);
        System.out.println("逆转后字符串：");
        System.out.println(str2);
        String s=",6,3,1";
        System.out.println("原字符串 : "+s);
        System.out.println("逆转后字符串："+wordReverse(s));
   }
    //单词逆转
    public static String reverse(String str){
        String[]strarray=str.split("\\s+");
        StringBuffer sbf=new StringBuffer();
        for(int i=strarray.length-1;i>=0;i--)
        sbf.append(strarray[i]+" ");
        return sbf.toString();
    }

    //字符逆转
    public static 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 String commonsEncode(String bstr) {
        return new String(new org.apache.commons.codec.binary.Base64()
                .encode(bstr.getBytes()));
    }
    
    public static String replaceChar(String str){
        //替换单引号
        if(str.indexOf("%27")!=-1){
            str=str.replace("%27", "'");
        }
        //替换双引号
        if(str.indexOf("%28")!=-1){
            str=str.replace("%28", "\"");
        }
        return str;
    }
}