Java利用正则表达式统计某个字符串出现的次数

//统计某个字符出现的次数
    private void countSubString(){
    	String string1="香蕉、玉米、面粉";
    	String string2="香蕉、玉米、面粉";
    	String string3="牛奶、鸡蛋";
    	StringBuffer stringBuffer=new StringBuffer();
    	stringBuffer.append(string1).append("、").append(string2).append("、").append(string3).append("、");
    	String totalString=stringBuffer.toString();
    	System.out.println("组拼后的字符串为:"+totalString);
    	
    	while (totalString.length()>0) {
    		//得到第一个字符串比如"香蕉、"
        	int index=totalString.indexOf("、");
        	String foodName=totalString.substring(0,index+1);
        	
        	Pattern pattern = Pattern.compile(foodName);  
        	Matcher matcher = pattern.matcher(totalString);  
        	int count=0;
        	while(matcher.find()){
        		count++;
        	}
        	totalString= totalString.replaceAll(foodName, "");
        	System.out.println("食品名字为:"+foodName+",出现次数为:"+count);
        	System.out.println("统计删除后字符串为:totalString="+totalString);
			System.out.println("===============================");
		}
    }