![]() We will use the following methods for iteration. Let’s take an example program where we will iterate entry of a hash map using Map.Entry method. Iterating Java HashMap using Map.Entrymethod Iterating over values of a hashmap using values() method. Iterating over keys of a hashmap using keySet() method. KeySet() method returns a set view of the keys from a hash map and values() method returns a collection-view of values from a hash map. Using keySet(), values(), and for-each loop, you can iterate over keys or values of a hash map. This technique is useful when you want to get a set view of keys or values of a hash map. Iterating over keys or values using keySet() and value() methods ("Entries of HashMap after removing: " +hmap.entrySet()) Įntries of HashMap after removing: Itr.remove() // This method will remove the last entry of a hash map while iterating. Removing the last entry returned by Iterator Here, entrySet is a method that is used to get a view of entries of a map. Let’s take another example where we will remove the last entry of a hash map returned by the Iterator. Iterator itr3 = hmap.values().iterator() values is a method that is used to get values of keys of a hash map. Iterator itr2 = hmap.keySet().iterator() keySet is a method that is used to get view of keys of a hash map. Iterator> itr = hmap.entrySet().iterator() ![]() entrySet is a method that is used to get view of entries of a hash map. Creating an Iterator object using iterator() method. HashMap hmap = new HashMap() // Creating a hash map. Iterating Over HashMap with Enhanced For-Loop Map keyValues = new HashMap() įor (Map.Entry entry : keyValues.Let’s take an example program where we will iterate hash map in java using java iterator concept. The () statement is executed for each element returned by the iterator, printing each name to the console. The hasNext() method checks if there is another element in the list, and if there is, the next() method returns that element. ![]() The while loop iterates through each element in the names list using the hasNext() and next() methods of the iterator. Iterating ArrayList Using Iterator List names = new ArrayList() Īn iterator object is created using the iterator() method of the names list. The lambda expression takes a name parameter, which represents each selected element in the stream, and prints each name to the console using the (name) statement. The forEach() method is then called on the resulting stream, which executes a lambda expression for each element that meets the condition specified in the filter() method. The stream() method of the names list is called to convert the list into a stream, and the filter() method is called on the stream to select only the elements that contain the letter “S” in them. Names.stream().filter(s->s.contains("S")).forEach(name -> (name)) forEach, Stream, Filter and Lamda List names = new ArrayList() The (name) statement is executed for each element in the list, printing each name to the console. The lambda expression takes a name parameter, which represents each element in the list. The forEach() method of the names list is called with a lambda expression as an argument. Iterating ArrayList with forEach() and Lambda List names = new ArrayList() Finally, we print each name variable to the console using the println() method of the System.out object. The for loop iterates through each element in the names list using the enhanced for loop (also known as the for-each loop) and assigns each element to a variable named name of type String. We then add three String objects to the list using the add() method. We declare a List of String objects named names using the ArrayList implementation. Frequently asked questions Iterating ArrayList with Enhanced For-Loop List names = new ArrayList().Iterating Over HashMap with forEach() and Lambda. ![]() Iterating Over HashMap with Enhanced For-Loop.Iterating ArrayList with forEach() and Lambda.Iterating ArrayList with Enhanced For-Loop.User Registration, Log in, Log out – Video Tutorials.
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