统计字符串中字符出现的次数并输出，出现次数最多的字符

     /**
     * 输出字符串s中出现次数最多的字符
     * @param s
     */
    public void testMaxCount(String s){
    	char[]a=s.toCharArray();
    	Map<String, Integer>  count=new HashMap<String, Integer>();
    	for(char c:a){
    		if(!count.containsKey(String.valueOf(c))){
        		count.put(String.valueOf(c), 1);
        	}else{
        		int i=count.get(String.valueOf(c))+1;
        		count.remove(String.valueOf(c));
        		count.put(String.valueOf(c), i);
        	}
    	}
    	Set<Entry<String, Integer>> ss=count.entrySet();
    	int max=0;
    	String maxName="";
    	for(Iterator<Entry<String, Integer>> it =ss.iterator();it.hasNext();){
    		Entry<String, Integer> o=it.next();
    		int value=o.getValue();
    		while(value>max){
    		  max=value;
    		  maxName=o.getKey();
    		}
    	}
    	System.out.println("出现次数最多的字符是："+maxName+"出现了:"+max+"次");
    	
    }