Iterating Through HashMap using Java Code

Learn how to effectively iterate through a HashMap in Java with practical examples. Understand various methods and best practices for efficient traversal of key-value pairs in a HashMap.
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HashMap is a widely used data structure in Java for storing key-value pairs. Iterating through a HashMap is a common operation, and Java provides several ways to achieve this. In this guide, we will explore different methods and provide examples to help you understand how to iterate through a HashMap effectively.

Method 1: Using Entry Set and Iterator

One of the most common methods to iterate through a HashMap is by using the entrySet() method along with an iterator. This method provides access to the key-value pairs in the form of Map.Entry objects.

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Method 2: Using forEach and Lambda Expression

Java 8 introduced the forEach method, making it more concise to iterate through the entries of a HashMap using lambda expressions.

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Method 3: Using keySet() and values()

If you only need to iterate through keys or values, you can use the keySet() or values() method.

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These are some of the commonly used methods to iterate through a HashMap in Java. Choose the method that best suits your requirements and coding style.