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Loop through keys in hashmap java7/7/2023 ![]() ![]() So none is better than the other, it depends on what you need to use and when. In terms of performance, both for-each loop and the iterators have the same time complexity. Is the Foreach loop better than the iterators method?It does not matter which method you use for the traversal of a map as long as it does the job for you. There you go! Your traversal is complete, just like that. Now traverse the map while keep checking the next entity that exists on the map. First, you need to import the iterator class, and then get the iterator for the entrySet. Key = 10, value = October ExplanationIn this example, we create explicit iterator to traverse / iterate over the map. Iterator> iterator = monthsInAYear.entrySet().iterator() iterate map / traverse the map using using iterator As an exercise, you can explore the rest of the methods to strengthen your command on this concept. Here, we have only used getKey() and getValue() to display the data on the console. Where you can use all the methods of Map.Entry as per your requirements. ![]() Each entrySet contains a key and corresponding values. By using the for-each loop, we get an entrySet() which provides an automated “view” of the data in the map, in the form of key-value pairs. Key = 5, value = Friday ExplanationIn this example we used the foreach loop to iterate over the map. ("key = " + entry.getKey() + ", value = " + entry.getValue()) Iterating over the Map.entrySet() using map.forEachįor (Map.Entry entry : businessDays.entrySet()) store business days i-e key/value pairs in the Map Please find the implementation of both methods below. However, we will focus on the most efficient and simple ways. What are some common ways to iterate a Map in Java?Though there are many ways to traverse a map. Let’s explore some of the options we have. Why do we need to iterate through a Map?We need to traverse or iterate over a map for accessing, modifying or removing data. ![]()
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