![]() In this method, we iterate the HashMap and invoke the put(k, v) method once for each mapping from key to value. It is the simplest way to clone a HashMap. This will ensure that all items in the map are copied over. You must also override the equals () and hashCode () methods when performing this operation. To perform this operation, you will use the clone () method of the map class. We’ll also consider some of the external libraries that can help us in specific cases. There are the following ways to clone a Map in Java: A deep copy of a hashmap can be created by copying each item in the map into a new map. In this tutorial, we’ll explore the concept of a shallow vs deep copy of a HashMap along with several techniques to copy a HashMapin Java. It inherits the AbstractMap class and implements the Map interface. Since Java 5, it is denoted as HashMap, where K stands for key and V for value. It allows us to store the null elements as well, but there should be only one null key. HashMap in Java is like the legacy Hashtable class, but it is not synchronized. The Java HashMap class belongs to java.util package. It is easy to perform operations using the key index like updation, deletion, etc. If we try to insert the duplicate key, it will replace the element of the corresponding key. Java HashMap class implements the Map interface which allows us to store key and value pairs, where keys should be unique. In this section, we will learn how to clone HashMap in Java. Besides these, we can also create a clone or copy of a Map. The implementation of the HashMap allows us to apply all the optional Map operations like add data to Map, delete data from the Map, retrieve key-value from the Map, determine the Map size, etc. Am I right Is there a better way to do it than just iterate. In this tutorial, we’ll look at ways of copying one HashMap onto another without replacing the keys and values of the target HashMap. ![]()
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