HashMap Iterator
Iterator returned by entrySet() and keySet() methods can be used to iterate a HashMap in Java Let us look at the code for the iterator using both entrySet() and keySet() methods: Output
HashMap
Iterate over Hashmap
HashMap is a popular class of Collections framework which is used to store key value pair. There are 2 ways to iterate over the hashmap and access its keys and values. Let us look at these ways: Using entrySet() method entrySet() method returns a Set of Map.Entry<K,V> type, where K is key and V is … Read more
Duplicate Keys and Values in HashMap
We are not allowed to enter duplicate keys in HashMap, but we can enter duplicate values in it. Please note here that, if we enter duplicate keys no error will be thrown but the latest key-value pair entered will replace the old key-value pair. Let us see with an example: In the above code we … Read more
HashMap in Java
HashMap is one of the most used collections in Java. It is used to store key value pair. The size of HashMap increases as more key value pairs are added. Let us look at sample declaration of HashMap: HashMap<Integer,String> dummy = new HashMap<Integer,String>(); In above sample the key stored will be of type Integer and … Read more