java中统计输入字符串中每个字符出现的次数

• 统计输入字符串中每个字符的出现次数
• 将结果存在hashmap中并输出

package baoxinhai_test_collection_hashset;

import java.util.HashMap;
import java.util.Iterator;
import java.util.Map.Entry;
import java.util.Scanner;
import java.util.Set;

/*
 *@author bxh
 *this program is to receive a string from the console,and then count the mount of every char that exists in the string
 * 
 */
public class Stringcount {
	public static void main(String[] args) {
		String_count();
	}
	
	// 函数统计字符串中每个字符出现的次数并返回输出结果 使用hashmap
	public static void String_count() {
		HashMap<String, Integer> map = new HashMap<>();
		Scanner is =new Scanner(System.in);
		System.out.println("请输入一个字符串：");
		String input=is.nextLine();       //存储输入的字符串
		for(int i=0;i<input.length();i++)
		{
			char c = input.charAt(i);
			String key=String.valueOf(c);
			if(map.containsKey(key))
			{
				Integer value=map.get(key);
				value++;
				map.put(key, value);
			}
			else {
				map.put(key, 1);
			}
		}
		System.out.println("统计结果如下：");
		
		//输出字符串
		Set<Entry<String, Integer>> set = map.entrySet();
		Iterator<Entry<String, Integer>> iterator = set.iterator();
		while (iterator.hasNext()) {
			Entry<java.lang.String, java.lang.Integer> entry = (Entry<java.lang.String, java.lang.Integer>) iterator
					.next();
			String key = entry.getKey();
			Integer value = entry.getValue();
			System.out.println(key+"-->"+value);
		}
		
	}
}