The difference between JVM heap and stack

Stack memory:

• The program runs in stack memory
• The stack stores basic data types and references to objects in the heap
• The stack is a runtime unit
  
• The stack solves the running problem of the program, that is, how the program is executed, or how to process data　
• One thread has an independent thread stack

Heap memory:　

• Most of the data required for program execution is stored in stack memory
• Objects are stored in the heap
• The heap is a storage unit, and the heap is just a shared memory block
• The heap solves the problem of data storage, that is, how to store data and where to store it
  
• All threads share heap memory

Parameter passing in Java (is it passing by value or by reference?):

• Program execution always occurs in the stack, so there is only the issue of passing basic types and object references when passing parameters, and the object itself is not passed directly
  

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