Heap & Stack Diagram in java

Heap Area :

• in java , Object Present in Heap Area.
• Object having 2 things that is Non - static field(s) and Non - static method(s).
• So, Non - static field(s) and non - static method(s) also present in heap area.

Stack Area :

• Stack Area follows First In Last Out (FILO) or Last In First Out(LIFO) technique .
• In java , local variable(s) & parameter variable(s) present in stack area .
• Each method having individual stack memory in Stack Area and it follow LIFO technique .
• Means If method execution completed then delete from the Stack Area.

Note :

• Primitive Field(s) / Primitive variable(s) holds direct value .
• Reference Field(s) / Reference variable(s) holds reference of Object instead of direct value .

public class Test
{
    Test t;
    int val;

    public Test(int val)
    {
        this.val = val;
    }

    public Test(int val, Test t)
    {
        this.val = val;
        this.t = t;
    }

    public static void main(String[] args)
    {
        Test t1 = new Test(100);
        Test t2 = new Test(200, t1);
        Test t3 = new Test(300, t1);
        Test t4 = new Test(400, t2);

        t2.t = t3;
        t3.t = t4;
        t1.t = t2;
        t2.t = t4.t;

        System.out.println(t1.t.val);
        System.out.println(t2.t.val);
        System.out.println(t3.t.val);
        System.out.println(t4.t.val);
    }
}

Output :

200
200
400
200