Java array expansion code example

In the process of writing programs, we often encounter that the array space is not enough. For example, I have initialized an array int [] a = {1,2,3,4,5,6,7,8,9,10}; At this time, I want to insert an element into the position of array subscript 3. What should I do? It's too difficult to implement in C language. You need to call the memcpy function one by one, but it doesn't need to be so troublesome in Java. There is a capacity expansion method called array, which is easy to implement. Let's look at the code:

It can also be implemented using library functions in Java

The above is the simple java implementation code for array expansion. I hope it can help you learn Java. Interested friends can refer to more content: re-entry lock and read-write lock of Java Concurrent Programming, talking about local and global variables in Java, talking about Java annotation and dynamic agent, etc. Thank you for your support.