How to Resize a Java Array While Keeping Existing Elements?

How to Increase Array Size in Java Preserving Current Elements?

Despite the convenience of arrays in Java, their fixed size poses a limitation when adding new elements. This article explores methods for resizing arrays while maintaining their current contents.

Unlike some other programming languages, Java arrays cannot be directly resized to accommodate additional elements. Instead, alternative approaches must be employed:

1. Creating a New Array and Copying: A new array with the desired capacity can be created and the elements from the original array copied over using System.arraycopy(...). This method ensures the preservation of existing elements.
2. Using ArrayList: The java.util.ArrayList<T> class provides dynamic array functionality. It automatically expands when new elements are added, eliminating the need for manual resizing.
3. Arrays.copyOf(...): Java provides Arrays.copyOf(...) methods that create a new array with a specified length, copying the contents of the original array. This offers a convenient way to increase array size and maintain its contents.

It's important to note that these methods create a new array, which replaces the original one. However, the original array's elements are preserved in the new array. Therefore, modifying the original array will not affect the new array and vice versa.

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