String类型的一些基本操作

public class StringOperation    
{   
    public static void main(String[] args)   
    {   
        String srcstr = "abcdefg";   
        String substr = "cdef";   
           
        String str = "I am from shandong";   
        String token = "from";   
        String isrevstr = "abcdcba";   
           
        String str1 = "abcdefg aeiou";   
        String str2 = "acdefgae";   
        String str3 = "abccdefcfgcsd";   
        String str4 = "123456789";   
        String str5 = "bei北京欢迎你jing我爱你中国China";   
           
        System.out.println(Search(srcstr, substr));   
        System.out.println(Reverse(str));   
        System.out.println(Reverse2(str));   
        System.out.println(Reverse(str, token));   
        System.out.println(isRevStr(isrevstr));   
        System.out.println(Compare(srcstr, substr));   
        System.out.println(getCommonStr(str1, str2));   
        System.out.println(DeleteStr(str3, 3, 3));   
        System.out.println(DeleteStr(str3, 'c'));   
        System.out.println(RightMove(str4, 6));   
        System.out.println(LeftMove(str4, 6));   
        System.out.println(getChineseNum(str5));   
    }   
       
    public static int Search(String srcstr, String substr)   
    {   
        int index = -1;   
           
        index = srcstr.indexOf(substr);   
           
        return index;   
    }   
       
    public static String Reverse(String str)   
    {   
        String[] temp = str.split(" ");   
           
        StringBuffer sb = new StringBuffer();   
           
        for(int i=temp.length-1; i>=0; i--)   
            sb.append(temp[i] + " ");   
           
        return sb.toString();   
    }   
       
    public static String Reverse2(String str)   
    {   
        StringBuffer sb = new StringBuffer();   
           
        sb.append(str);   
           
        return sb.reverse().toString();   
    }   
       
    public static String Reverse(String str, String token)   
    {   
        StringBuffer sb = new StringBuffer();   
        StringBuffer temp = new StringBuffer();   
           
        sb.append(str.replaceFirst(token, temp.append(token).reverse().toString()));   
           
        return sb.reverse().toString();   
    }   
       
    public static boolean isRevStr(String str)   
    {   
        boolean flag = true;   
           
        for(int i=0; i<str.length()/2; i++)   
        {   
            if(str.charAt(i) != str.charAt(str.length()-1-i))   
            {   
                flag = false;   
                break;   
            }   
        }   
           
        return flag;   
    }   
       
    public static int Compare(String str1, String str2)   
    {   
        int index = 0;   
        int len = 0;   
           
        if(str1.length() <= str2.length())   
        {   
            len = str1.length();   
        }   
        else  
        {   
            len = str2.length();   
        }   
           
        int i=0;   
        for(i=0; i<len; i++)   
        {   
            if(str1.charAt(i) == str2.charAt(i))   
            {   
                index = 0;   
            }   
            else if(str1.charAt(i) < str2.charAt(i))   
            {   
                index = -1;   
                break;   
            }   
            else  
            {   
                index = 1;   
                break;   
            }   
        }   
           
        if(i == len)   
        {   
            if(str1.length() < str2.length())   
                index = -1;   
            else if(i < str1.length())   
                index = 1;   
        }   
           
        return index;   
    }   
  
    public static String getCommonStr(String str1, String str2)   
    {   
        String temp = "";   
        String longstr = "";   
        String shortstr = "";   
        String commonstr = "";   
        boolean flag = false;   
           
        if(str1.length() >= str2.length())   
        {   
            longstr = str1;   
            shortstr = str2;   
        }   
        else  
        {   
            longstr = str2;   
            shortstr = str1;   
        }   
           
        for(int i=shortstr.length()-1; i>0; i--)   
        {   
            for(int j=0; j<shortstr.length()-i; j++)   
            {   
                temp = shortstr.substring(j, i+j+1);   
                if(longstr.indexOf(temp) >= 0)   
                {   
                    flag = true;   
                       
                    commonstr = temp;   
                       
                    break;   
                }   
            }   
               
            if(flag)   
                break;   
        }   
           
        return commonstr;   
    }   
  
    public static String RightMove(String str, int length)   
    {   
        int len = length % str.length();   
           
        StringBuffer sb = new StringBuffer();   
           
        sb.append(str.substring(str.length()-len)).append(str.subSequence(0, str.length()-len));   
           
        return sb.toString();   
    }   
       
    public static String LeftMove(String str, int length)   
    {   
        int len = length % str.length();   
           
        StringBuffer sb = new StringBuffer();   
           
        sb.append(str.substring(len)).append(str.subSequence(0, len));   
           
        return sb.toString();   
    }   
       
    public static String DeleteStr(String str, int pos, int len)   
    {   
        StringBuffer sb = new StringBuffer();   
           
        sb.append(str.substring(0, pos-1)).append(str.substring(pos+len-1));   
           
        return sb.toString();   
    }   
       
    public static String DeleteStr(String str, char ch)   
    {   
        return str.replaceAll(String.valueOf(ch), "");   
    }   
       
    public static int getChineseNum(String str)   
    {   
        int count = 0;   
           
        byte[] array = str.getBytes();   
           
        count = array.length - str.length();   
           
        return count;   
    }   
}