java map實現排序功能
阿新 • • 發佈：2019-02-07
public static void main(String[] args) {
Map<String, String> map = new HashMap<String, String>();
map.put("2", "ccccc");
map.put("1", "aaaaa");
map.put("4", "bbbbb");
map.put("3", "ddddd");
List<Map.Entry<String,String>> list = new ArrayList<Map.Entry<String,String>>(map.entrySet());
Collections.sort(list,new Comparator<Map.Entry<String,String>>() {
//升序排序 比較器
@Override
public int compare(Entry<String, String> o1, Entry<String, String> o2) {
return o1.getKey().compareTo(o2.getKey());
}
});
for(Map.Entry<String,String> mapping:list){
System.out.println(mapping.getKey()+":"+mapping.getValue());
}
}