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⭐Column introduction
This column will continue to update various questions about JAVA, including interview questions, JAVA introduction to proficiency, etc.
The update speed is maintained at 3-5 articles per day
Problem Description
The difference between heap and stack in java
Answer
In Java, the heap and stack are two different memory domains used to store data while the program is running. They have the following differences:
Allocation method: Heap memory is dynamically allocated and automatically managed by the Java Virtual Machine (JVM). Stack memory is statically allocated and automatically managed by the compiler.
Storage content: Heap memory is used to store reference type data such as object instances and arrays. Stack memory is used to store basic type data such as method calls, local variables, and method parameters.
Memory management: The allocation and recycling of heap memory is the responsibility of the garbage collection mechanism of the Java Virtual Machine (JVM). The allocation and release of stack memory is automatically handled by the compiler. When a method is executed, the stack memory occupied by it will be automatically released.
Space size: The heap memory space is large and can be dynamically expanded. The stack memory space is small and the size is fixed.
Storage speed: Heap memory allocation is slower because memory space needs to be allocated dynamically at runtime. Stack memory allocation is faster because it uses pointers to locate data.