![]() ("Steve's salary after deductions = " + hashMap. HashMap.put("Steve", new Integer(deductions - 3000)) Int deductions = ((Integer)hashMap.get("Steve")).intValue() ("Amy's salary after bonus = " + hashMap.get("Amy")) HashMap.put("Amy", new Integer(bonus + 5000)) Int bonus = ((Integer)hashMap.get("Amy")).intValue() ("Size of IdentintyHashMap: "+hashMap.size()) A HashMap however, store items in key/value pairs, and you can access them by an index of another type (e.g. So I need a HashMap that load at first my values, and then, use this Map throughout the other classes. Then, I need to get the values from this HashMap in Class B, Class C, etc. Map.Entry map = (Map.Entry)iterator.next() Im working with Spring Boot, and I need to load a HashMap with some values from Class A. HashMap.put("Nathan", new Integer(25000)) Constructors of Java HashMap class HashMap(Map< extends K, extends V> m), It is used to initialize the hash map by using the elements of the given Map object.HashMap.put("Steve", new Integer(23000)) HashMap.put("Jacob", new Integer(45000)) ![]() HashMap.put("Katie", new Integer(30000)) This constructor initializes both the capacity and fill ratio of the hash map by using its arguments.įollowing is an example displaying how to initialize and work with HashMap in Java − Example This constructor initializes the capacity of the hash map to the given integer value, capacity. This constructor initializes the hash map by using the elements of the given Map object m. This constructor constructs a default HashMap. This allows the execution time of basic operations, such as get( ) and put( ), to remain constant even for large sets.įollowing is the list of constructors supported by the HashMap class. The HashMap class uses a hashtable to implement the Map interface.
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