importjava.util.HashMap;publicclassMain{publicstaticvoidmain(String[]args){// 创建一个HashMapHashMap<Integer,String>map=newHashMap<Integer,String>();// 添加一些元素map.put(1,"apple");map.put(2,"banana");map.put(3,"orange");// 使用containsValue()方法查找值booleanresult=map.containsValue(...
ConcurrentHashMap.Contains(Object) Method Reference Feedback Definition Namespace: Java.Util.Concurrent Assembly: Mono.Android.dll Tests if some key maps into the specified value in this table. [Android.Runtime.Register("contains", "(Ljava/lang/Object;)Z", "GetContains_Ljava_lang_O...
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 code to illustrate the contains() method importjava.util.*; importjava.util.concurrent.*; publicclassConcurrentHashMapDemo{ publicstaticvoidmain(String[]args) { // Creating an empty ConcurrentHashMap ConcurrentHashMap<String,Integer> hash_map=newConcurrentHashMap<String, Integer>(); // ...
1. What does the containsValue() method in HashMap do? A. Checks if the map contains a specific key B. Checks if the map contains a specific value C. Removes a specific value from the map D. Returns the size of the map Show Answer 2. Which of the following is the correct...
The return type of the method isboolean, it returns true when this HashMap hold at least one key element for the given value element (val_ele) otherwise it returns false. Example: // Java program to demonstrate the example// of boolean containsValue(Object val_ele)// method of HashMapim...
ConcurrentHashMap containsValue() Method in Java java.util.concurrent.ConcurrentHashMap.containsValue() 方法是 Java 中的一个内置函数,它接受一个值并在一个或多个键映射到指定值时返回 true。该方法遍历整个哈希表。因此它是一个比 containsKey() 方法慢得多的函数。
HashMap: {Canberra=Australia, Washington=USA} Updated HashMap: {Madrid=Spain, Canberra=Australia, Washington=USA} In the above example, notice the expression, if(!countries.containsValue("Spain")) {..} Here, we have used thecontainsValue()method to check if the specified valueSpainis present...
HashSet将元素存放在HashMap中(HashMap的key) contains()方法调用HashMap的containsKey(...在该方法中,首先根据key计算hash值,然后从HashMap中取出该hash值对应的链表(链表的元素个数将很少),再通过变量该链表判断是否存在给定值。...总结通过第二节的实例可以看出,使用ArrayList的contains()耗时是使用HashSet的contai...
在Java中,AbstractMap类是一个抽象类,实现了Map接口,提供了一些通用的方法。其中,containsValue()方法用于检查Map中是否包含指定的值。本文将通过一个示例来说明该方法的使用方法。示例代码import java.util.AbstractMap; import java.util.HashMap; public class Main { public static void main(String[] args) { ...