Get() method accepts a key for the map entry and returns the corresponding value. This key can be used to retrieve the corresponding value using get() method of the map. In every iteration, the iterator’s next() method will return the key for a map entry. This set of keys can be iterated using a. Iterator> iterator = map.entrySet().iterator() Ī map has a keySet() method which returns a of all the keys of the map. When next() is called, iterator moves on to the next element in the set. This set can also be iterated using a .Ī java iterator contains a hasNext() method which returns true if the set has an element to be iterated and a next() method that returns the set element at the current iterator position. ("Value: "+entry.getValue()) Īs discussed above, elements of a map are stored as entries and entrySet() method returns those entries in the form of a. This set can then be iterated using a for loop as shown below. These entries are instances of type which is a nested interface of interface.Įach entry corresponds to a map element and contains key and value for that element with methods to retrieve them( getKey() and getValue()) and modify them( setKey() and setValue()).Įntries stored in a map can be retrieved by calling entrySet() method on the map. map.forEach((key, value) -> ("Key: " + key + ", value= " + value)) Ī map stores data in key-value pairs also known as entries.
If you print both key and value in a single statement, then curly braces in lambda expression can be omitted as shown below. Hence, we can supply a Lambda expression to forEach() method with two arguments which are the key and value of a map element. import įorEach() method takes an argument of type which is a functional interface having a method which accepts two arguments. In the current example, we just print the key and value of the entry. In every iteration, it is supplied with two arguments, one is a key and another is the value of current map entry.
This method can be used to iterate through a hashmap. Starting java 8, forEach() method is added to interface.
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