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 ma
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 documentation forjava.util.HashMap.remove(java.lang.Object). Portions of this page are modifications based on work created and shared by theAndroid Open Source Projectand used according to terms described in theCreative Commons 2.5 Attribution License. ...
In the above example, we have created a hashmap namedlanguages. Here, theremove()method does not have an optionalvalueparameter. Hence, the mapping with key2is removed from the hashmap. Example 2: HashMap remove() with Key and Value importjava.util.HashMap;classMain{publicstaticvoidmain(St...
* Returns an integer hash code for the receiver. {@code Object} which are * equal return the same value for this method. * * @return the receiver's hash code. * @see #equals(Object) */ public int hashCode(); /** * Sets the value of this entry to the specified value, replacing...
Java documentation forjava.util.concurrent.ConcurrentHashMap.remove(java.lang.Object, java.lang.Object). Portions of this page are modifications based on work created and shared by theAndroid Open Source Projectand used according to terms described in theCreative Commons 2.5 Attribution License. ...
How to use remove method in org.slf4j.Marker Best Java code snippets using org.slf4j.Marker.remove (Showing top 20 results out of 315) origin: stackoverflow.com How to clear all the markers in v2 google map? private ArrayList<Marker> mMarkers; ... private void removeMarkers() { for...
5 * element returned by the iterator in turn to see if it's contained 6 * in the specified collection. If it's so contained, it's removed from 7 * this collection with the iterator's <tt>remove</tt> method. 8 * 9 * <p>Note that this implementation will throw an ...
In this article, we will discuss how to remove key-value pair or entry from HashMap. In this article, we will look into two different ways we can remove key-value pair or entry from HashMap. Usingjava.util.Map.remove(Object key)method ...
}if(null== userMap){ userMap =newHashMap<String, String>(); XHTCacheManager.addMode("moblieUserList", userMap); } } ... } 注:并发场景下remove操作加锁,而不是Iterator加锁,这个是很多网文的谬误,HashMap是非线程安全的它的put和remove都应该加锁处理,可以使用HashTable建议使用ConcurrentHashMap。