java中map可以按插入順序倒序輸出么？

問題描述

public class Test { public static void main(String[] args) {LinkedHashMap<String,String> a=new LinkedHashMap<String,String>();a.put('a', '1');a.put('b', '2');a.put('c', '3');for(String b:a.keySet()){ System.out.println(b+'值為:'+a.get(b));} }}

輸出為a值為:1b值為:2c值為:3想要倒序輸出怎么實現

問題解答

public class Test {

public static void main(String[] args) { LinkedHashMap<String,String> linkedhashmap = new LinkedHashMap<String,String>(); linkedhashmap .put('a', '1'); linkedhashmap .put('b', '2'); linkedhashmap .put('c', '3'); ListIterator<Map.Entry<String,String>> i = new ArrayList<Map.Entry<String,String>>(linkedhashmap.entrySet()).listIterator(linkedhashmap.size());while(i.hasPrevious()) { Map.Entry<String, String> entry=i.previous(); System.out.println(entry.getKey()+':'+entry.getValue()); } }

}