06-Play from zero javaweb-array in memory storage form

First, the memory partition of the JVM

　　To understand the memory storage of an array, first understand the overall memory partitioning of the JVM, see 04JVM memory detail

　　

Second, the array in the JVM storage detailed

If we have the following code:

In the above code, the process of creating an array can be divided into three steps:

1. Declare an array of type int ages int [] ages;

2. Initialize array new int[]{10,20,30} in the heap;

3. Assign the address of the initial array to the ages variable

　　

　　

Is int[] ages = new int[]{} in the memory of the embodiment of the form

You can see that the value of ages is actually the address of the array in the heap

So when you go to the print group, you'll find that you're printing an address, not a value in the array.

　　

When executing ages = new int[]{40,50,60}
Initializes a new array in the heap
Re-assigns the address of the array to the ages

　　

06-Play from zero javaweb-array in memory storage form