java 按顺序存取的map linkedhashmap

1.hashmap

Map<String,String> map=new HashMap<String,String>();
map.put("adfa", "1");
map.put("bacaa", "2");
map.put("ceewq", "3");
map.put("dklo", "4");
for(String key:map.keySet())
	System.out.println(key+"==>"+map.get(key));

adfa==>1
dklo==>4
bacaa==>2
ceewq==>3

2.linkedhashmap

Map<String,String> map=new LinkedHashMap<String,String>();
map.put("adfa", "1");
map.put("bacaa", "2");
map.put("ceewq", "3");
map.put("dklo", "4");
for(String key:map.keySet())
	System.out.println(key+"==>"+map.get(key));

adfa==>1
bacaa==>2
ceewq==>3
dklo==>4