java 删除重复字符

 

/**
 * 删除重复字符
 * @param str 字符串
 * @param deleteStr 删除的字符串
 * @param keepNum 保留字符，从1开始
 * @return
 */
private static String deleteStr(String str,String deleteStr,int keepNum){
	keepNum = keepNum - 1;
	String deleteStrs = "";
	if (deleteStr.equals(".") || deleteStr.equals("|")) {
		deleteStrs = "\\"+deleteStr ;
	}
	String res = "";
	String[]  strs=str.split(deleteStrs);
	if (keepNum>=strs.length -1) {
		keepNum = -1;
	}
	for(int i=0,len=strs.length;i<len;i++){
		System.out.println(strs[i]);
		if (i==keepNum) {
			  res = res + strs[i].toString()+deleteStr;
		}else{
			res = res + strs[i].toString();
		}
	}
	return res;
}