Java Map按Key值进行排序

package com.cute.test;
import java.util.Comparator;
import java.util.Map;
import java.util.TreeMap;
public class SortMapTest {
public static void main(String[] args) {
Map tmap = new TreeMap();
tmap.put(“abc”, “2”);
tmap.put(“ace”, “3”);
tmap.put(“cef”, “2”);
tmap.put(“Weight”, “6”);
tmap.put(“BLue”, “6”);
tmap.put(“BLUe”, “6”);

//对map利用key排序
Map resMap = sortMapByKey(tmap);
for (Map.Entry entry : resMap.entrySet()) {
System.out.println(entry.getKey() + “ “ + entry.getValue());
}
}
/*
让 Map按key进行排序
*/
public static Map sortMapByKey(Map map) {
if (map == null || map.isEmpty()) {
return null;
}
Map sortMap = new TreeMap(new MapKeyComparator());
sortMap.putAll(map);
return sortMap;
}
}
//实现一个比较器类
class MapKeyComparator implements Comparator {
@Override
public int compare(String s1, String s2) {
return s1.compareTo(s2); //从小到大排序
}
}
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原文链接：https://blog.csdn.net/u010180815/article/details/78980844