![]() Syntax: put(K key, V value) where ‘K’ refers to the type of key and ‘V’ to the type of value. ![]() Key value pairs can be mapped by using put() method. It returns the collection of values present in the map. Removes the key value pair for the specified key from the map if it is present. HashMap is a non-synchronized class of the Java Collection Framework that contains null values and keys, whereas Map is a Java interface, which is used to map key-pair values. Returns the number of key-value pairs in the map. HashMap class is found in the java.util package. It is easy to perform operations using the key index like updation, deletion, etc. If you try to insert the duplicate key, it will replace the element of the corresponding key. Maps the specified key with the specified value in the map. Java HashMap class implements the Map interface which allows us to store key and value pair, where keys should be unique. Returns a Set which contains the key value pairs of the map.Ĭompares the specified object with the map object for equality. Returns the value to which the specified key is mapped, or null if the map contains no mapping for the key. Returns true, if the map contains a key for the specified value. Returns true, if the hashmap object contains a value for the specified key. Removes all the key-value pairs from the Hashmap. When the number of elements exceeds the product value (12*0.5 = 6), then the capacity will be doubled. Hashmap object is created with an initial capacity of 12 and with load factor as 0.5.When the size of the hashmap reaches the value which is the product of initial capacity and the load factor, the capacity of hashmap is doubled.Load factor is a value based on which the capacity of the hashmap is doubled. HashMap is one of the most often used java collection.Creates an empty HashMap object with the specified initial capacity and load factor. How to Create a HashMap in Java In order to create and use a HashMap, you must first import the package.Syntax: HashMap obj = new HashMap(int initialCapacity, float loadFactor) When 10th element is added, the capacity is doubled to 24. HashMap object Number is created with initial capacity as 12. When the size of the hashmap exceeds 3/4th of the initial capacity, the capacity of the hashmap is doubled.Įxample: HashMap Number = new HashMap(12) HashMap object ‘obj’ is created with the specified initial capacity.It provides many useful data structures for developers to. Syntax: HashMap obj = new HashMap(int initialCapacity) Java is a popular programming language used for developing a wide range of applications, including web, mobile, and desktop applications. By default a hashmap with a capacity of 16 is created and when the size of the hashmap (number of elements) exceeds 3/4th of the capacity (12), the capacity of the hashmap is doubled (32).Syntax: HashMap obj = new HashMap() //using Generics HashMap obj = new HashMap() //Without Generics
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