Java array expansion instance code

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

Operation results:

summary

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