网友答疑1

问题：

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

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运行：

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

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