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Advanced Java Programming.ppt

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Advanced Java Programming.ppt

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Advanced Java Programming

The Stack

• The stack is the place where all local variables

are stored

– a local variable is declared in some scope

– Example

int x; // creates the variable x on the stack

• As soon as the scope ends, all local variables

declared in that scope end

– the variable name and its space are gone

– this happens implicitly – the user has no control over

The Heap

• The heap is an area of memory that the

user handles explicitly

– user requests memory through new operator

– java does garbage collection to reclaim

unused memory

• A user maintains a handle on memory

allocated in the heap with a reference

variable

Creating Objects

• All objects are created on the heap

• A reference to object is stored on the stack

– simply declaring an object does not create it

• automatically set to null

– new operator allocates space on the heap

Creating Objects

• Example

Object obj1 = new Object();

Object obj2;

main

x = 3

func1

obj1 = 200

obj2 = null

200

Heap

Stack

Object

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