What are the data structures of heap and stack in java

The heap and stack in Java are different data structures that store object and method call information respectively. The heap is dynamically allocated, managed by the garbage collector, and can store objects and arrays, while the stack is fixed size, stores local variables and parameters, and can only be accessed by the current method.

Heap and stack in Java

In the Java Virtual Machine (JVM), the heap and stack are two Different data structures used to store different types of data:

Heap

• The heap is a dynamically allocated memory area used to store object instances and array.
• When creating a new object or array, the JVM allocates memory in the heap.
• The size of the heap is variable and can dynamically grow or shrink as needed.
• Objects in the heap can reference each other to form complex data structures.
• The garbage collector is responsible for managing the heap and recycling objects that are no longer used.

Stack

• The stack is a linear data structure used to store method call information, including local variables, parameters and return addresses.
• When a method is called, a new stack frame will be pushed onto the stack.
• The stack frame contains all local variables and parameters of the method.
• When the method returns, its stack frame will be popped off the stack.
• The stack size is fixed and determined by the JVM at runtime.
• The data in the stack can only be accessed by the current method.

Difference

• Storage type: The heap stores objects and arrays, while the stack stores method call information.
• Allocation method: The heap is dynamically allocated, while the stack is of fixed size.
• Garbage collection: The heap is managed by the garbage collector, but the stack is not.
• Access scope: The data in the heap can be shared among multiple threads, while the data in the stack can only be accessed by the current method.

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