In Java, the keySet() method is a method of the class that returns a Set view of the keys contained in the hashmap.
#Java for loop hashmap how to
How to Iterate Through a Java Hashmap Using a for loop with keySet() We then extract the key and value from each Map.Entry object and print them to the console. We then use a while loop with the hasNext() and next() methods to iterate through the set and retrieve each key-value pair. We then create a new Iterator object using the entrySet() method, which returns a set of key-value pairs as Map.Entry objects. In this example, we once again create a new hashmap and add some key-value pairs to it. Iterator> iterator = map.entrySet().iterator() Here is an example of how to do this: HashMap map = new HashMap() How to Iterate Through a Java Hashmap Using a while Loop with an IteratorĪnother way to iterate through a hashmap is by using a while loop with an Iterator.
We then use a for-each loop to iterate through the hashmap, retrieving each key-value pair as a Map.Entry object. In this example, we first create a new hashmap and add some key-value pairs to it. One of the simplest ways to iterate through a hashmap is by using a for-each loop. How to Iterate Through a Java Hashmap Using a for-each Loop Firstly, you initiate the hashmap, use an iterator to iterate through the hashmap, and finally display your output. Most of the time, the steps involved in the process of looping through a hashmap are pretty straightforward. In this article, we will walk through a detailed outline of how to iterate through a hashmap with a loop in Java, using different types of loops. Iterating through a hashmap is a regular operation that developers perform frequently. It is widely used in many programming languages, including Java, Python, and JavaScript. Hashmap is a data structure used in programming to store data in key-value pairs.
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