网友答疑1

问题：

 

代码：

package map;

import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;

public class SortMap {

	public static void main(String[] args) {
		HashMap<String, String> srcMap = new HashMap<String, String>();
		srcMap.put("type0", "3");
		srcMap.put("type1", "0");
		srcMap.put("type4", "0");
		srcMap.put("type5", "2");
		srcMap.put("type3", "2");
		srcMap.put("type2", "2");

		HashMap<String, KeyCountInfo> sortMap = new HashMap<String, KeyCountInfo>();

		for (String key : srcMap.keySet()) {
			String value = srcMap.get(key);

			int count = 0;
			KeyCountInfo countInfo = sortMap.get(value);

			if (null != countInfo) {
				count = countInfo.count;
			} else {
				countInfo = new KeyCountInfo();
			}
			countInfo.addKey(key);
			countInfo.setCount((count + 1));
			sortMap.put(value, countInfo);
		}

		List<String> list = new ArrayList<String>(sortMap.keySet());
		Collections.sort(list);
		String keyMin = list.get(0);
		String keyMax = list.get(list.size() - 1);
		System.out.println("MinValue:" + keyMin + ";" + sortMap.get(keyMin));
		System.out.println("MaxValue:" + keyMax + ";" + sortMap.get(keyMax));

	}

	public static class KeyCountInfo {
		List<String> keys = new ArrayList<String>();
		int count;

		public void addKey(String key) {
			this.keys.add(key);
		}

		public void setCount(int count) {
			this.count = count;
		}

		@Override
		public String toString() {
			return "Keys:" + keys.toString() + " count:" + count;
		}

	}
}

 

运行：

MinValue:0;Keys:[type1, type4] count:2
MaxValue:3;Keys:[type0] count:1