Introduction to the difference between heap and stack

First of all, we know that the heap and stack are both places used by Java to store data in RAM. So, what's the difference between them?

Heap:

1. Java's heap is a runtime data area, and class objects allocate space from the heap. These objects are created through instructions such as new and destroyed through the garbage collector.

2. The advantage of the heap is that it can dynamically allocate memory space. You do not need to tell the compiler how much memory space is needed in advance, because it is dynamically allocated at runtime. But the disadvantage is that because memory needs to be dynamically allocated at runtime, the access speed is slower.

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Stack

1. The stack mainly stores some basic data type variables (byte, short , int, long, float, double, boolean, char) and references to objects.

2. The advantage of the stack is that the access speed is faster than the heap, and the stack data can be shared. But the disadvantage is that the amount of memory space occupied by the data stored in the stack needs to be determined at compile time, which lacks flexibility.

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