This method is invoked whenever the value in an entry is overwritten by an invocation of put(k,v) for a key k that's already in the HashMap. 翻译:每当条目中的值被put(k,v)的调用覆盖到HashMap中的键k时,就会调用该方法。 如果不一样,则在Entry数组中插入一个链表。此方法就是在Entry容器中...
put方法向这个map中增加指定的键值对,如果map中已经包含了这个键,就替换掉旧的值,并且返回这个值。如果map中不包含这个键,就返回null。 /** * Associates the specified value with the specified key in this map. * If the map previously contained a mapping for the key, the old * value is replaced....
1 一、Put:让我们看下put方法的实现：/***Associatesthespecifiedvaluewiththespecifiedkeyinthismap.Ifthe*mappreviouslycontainedamappingforthekey,theoldvalueis*replaced.**@paramkey*keywithwhichthespecifiedvalueistobeassociated*@paramvalue*valuetobeassociatedwiththespecifiedkey*@returnthepreviousvalueassociatedwith...
* @return 如果写入冲突(说明此前有和他相同的节点,也就是key和hash值和他一模一样),则返回冲突的节点的值,如果没有冲突,则返回null */ publicVput(K key,V value) { return putVal(key, value, false); } /** * 将原有的Map中的键值对全部移动到现在的HashMap中, * 如果节点已经存在(key相同并且h...
util.HashMap; public class Main { public static void main(String[] args) { HashMap<String, String> capitalCities = new HashMap<String, String>(); capitalCities.put("England", "London"); capitalCities.put("Germany", "Berlin"); capitalCities.put("Norway", "Oslo"); capitalCities.put("...
// Java program to demonstrate// put() methodimportjava.util.*;importjava.util.concurrent.ConcurrentHashMap;publicclassConcurrentHashMapExample{publicstaticvoidmain(String[]args){// Creating ConcurrentHashMapMap<String,String>my_cmmap=newConcurrentHashMap<String,String>();// Adding elements to the ...
/** * 其实下面的代码等价于如下内容: * last.next=node; * last = node; */ private void ...
The method put is not applicable for the argumentsHashMap m = new HashMap();ArrayList l = new ArrayList();l.add("aaa");m.put("a", l);The method put(capture#10-of ?, capture#11-of ?) in the type HashMap is not applicable for the arguments (String, ArrayList)...
* Returns a hash code value for the object. This method is * supported for the benefit of hash tables such as those provided by * {@link java.util.HashMap}. * <p> * The general contract of {@code hashCode} is: * <ul> * <li>Whenever it is invoked on the same object more than...
Here, the put() method inserts the key/value mappings to the hashmap. Note: Every item is inserted in random positions in the HashMap. Example 2: Insert Item with Duplicate Key import java.util.HashMap; class Main { public static void main(String[] args) { // create an HashMap Hash...