解析 HashMap 源码概括

public class Test11 {
	public static void main(String[] args) {
		HashMap<String, String> stringStringHashMap = new HashMap<>();
		stringStringHashMap.put("a","a");
		stringStringHashMap.put(null,"a");
		stringStringHashMap.get("a");
		stringStringHashMap.get(null);
		stringStringHashMap.remove("a");
		stringStringHashMap.replace("a","a1");
		
		stringStringHashMap.containsKey("");
		stringStringHashMap.containsValue("v");
		// ......
		Set<String> strings = stringStringHashMap.keySet();
		Iterator<Map.Entry<String, String>> iterator = stringStringHashMap.entrySet().iterator();
		while (iterator.hasNext()) {
			Map.Entry<String, String> next = iterator.next();
			System.out.println(next.getKey());
		}
		System.out.println(null+"");
		
	}
}