java character occurrences statistics

方法一:

public static void main(String[] args) {
		String str="我的祖国,我爱你伟大的国度!";
		
		Map map=getCount(str);
		System.out.println(map);
	}
	
	
	public static Map getCount(String str){
		Map map=new HashMap();
		for(int i=0;i<str.length();i++){
			char c=str.charAt(i);
			if(map.containsKey(c)){//c是否在map中,是否统计过
				int count=(Integer)map.get(c)+1;//统计这就取出原值,再加1
				map.put(c, count);
			}else{//没有统计过
			    map.put(c, 1);	
			}
		}
		
		return map;
	}

Method Two:

public static void main(String[] args) {
		String str="我的祖国,我爱你伟大的国度!";
		
		Map map=getCount(str);
		System.out.println(map);
	}
	
	
	public static Map getCount(String str){
		Map map=new HashMap();
		for(int i=0;i<str.length();i++){
			char c=str.charAt(i);
			Integer count=(Integer)map.get(c);
			count= count==null?1:count+1;
			map.put(c, count);
		}
		
		return map;
	}

 

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Origin blog.csdn.net/u012255097/article/details/103691912