Tools: the array elements in the specified format specified range (including the prefix and suffix, separators, etc.) connected to a string

 

 

   

public  class of StringUtil 
{ 
    Private  static String checkNull (String STR) 
    { 
        IF (STR == null ) 
        { 
            return  "" ; 
        } 
        return STR; 
    } 
    
    Private  static String checkToString (Object obj) 
    { 
        IF (obj == null ) 
        { 
            return  " null " ; 
        } 
        return obj.toString (); 
    } 
    
    / *  
     * the array elements in the specified range is connected to a string format specified 
     @param src source array *
     * @Param prePrompt front prompt string, is generally empty, "" commonly used are "XXX:" 
     * @param prefix prefix string, typically "[" 
     * @param suffix suffix string, generally "]" 
     * @param separator separator elements of an array, generally set by a semicolon "," 
     * @param Start to participate in the first element of the array subscripts connection 
     length * @param len array element is connected to participate 
     * @return array element is connected to the character string 
     * / 
    Private  static   String concatElementsToString (Object [] the src, prePrompt String, String prefix, suffix String, 
        String Separator, int Start, int len) 
    { 
        IF (the src == null ) 
        { 
            return  "" ;
        }
        if (src.length == 0)
        {
            return "";
        }
        if (len <= 0 )
        {
            return "";
        }
        if(len>src.length-start){
            len=src.length-start;
        }
        
        prePrompt = checkNull(prePrompt);
        prefix = checkNull(prefix);
        suffix = checkNull(suffix);
        separator = checkNull(separator);
        
        StringBuilder strBuilder = new StringBuilder();
        strBuilder.append(prePrompt);
        strBuilder.append(prefix);
        for (int i = start; i < start + len; i++)
        {
            strBuilder.append(checkToString(src[i]));
            strBuilder.append(separator);
        }
        int oldStringBuilderLength = strBuilder.length();
        StringBuilder resultStrBuilder = new StringBuilder(
            strBuilder.toString().substring(0, oldStringBuilderLength - separator.length()));
        resultStrBuilder.append(suffix);
        returnresultStrBuilder.toString (); 
    } 
    
    
    
  
    / * * 
     * all elements of the array is connected to a format specified string 
     * @param src source array 
     * @param prefix prefix string, typically "[" 
     * @param suffix suffix string, generally "]" 
     * @param separator separator elements of an array, generally set by a semicolon "," 
     string * @return array element connected to 
     * / 
    public  static string concatElementsToString (Object [] the src, string prefix, suffix string , string Separator) 
    { 
        
        return concatElementsToString (the src, null , prefix, suffix, Separator, 0 , src.length); 
        
    } 
 
    / * * 
     * the elements in the specified range of the array is connected to a format specified string  
     @param src source array *
     * @param prefix prefix string , usually "["
     * @Param suffix suffix string, generally "]" 
     * @param Separator separator elements of an array, generally set by a semicolon "," 
     * @param Start the first element is connected to participate in the array subscript 
     * @param len to participate length of the connecting element array 
     string * @return array element connected to 
     * / 
    public  static string concatElementsToString (Object [] the src, string prefix, suffix string, string Separator, int Start, int len) {
         return concatElementsToString (the src, null , prefix, suffix, Separator, start, len); 
    } 
    
    / * * 
     elements * array index is greater than or equal to start connection to a format specified string 
     * @param src source array 
     * @param separator separator elements of an array, generally set by a semicolon", " 
     * @param prefix prefix string, typically "["
     * @Param suffix suffix string, generally "]"
     * @Param start to participate in the first element of the array subscripts connected 
     string * @return array element connected to 
      "* / 
    public  static String concatElementsToString (Object [] the src, String prefix, suffix String, String Separator, int Start) {
         return concatElementsToString (the src, null , prefix, suffix, Separator, Start, src.length- Start); 
    } 
    public  static  void main (String [] args) 
    { 
        String A = concatElementsToString (Constants.ISSUE_CODES, " [ " , " ] " , \ R & lt \ n- " , . 1 ,3);
        
        String b=concatElementsToString(Constants.ISSUE_CODES,"[" ,"]", "||",9);
        String c=concatElementsToString(Constants.ISSUE_CODES,"[" ,"]", ",");
        System.out.println(a);
        System.out.println(b);
        
        System.out.println(c);
    }
}

 Console output