54 Program on Garbage Collection in Java Part:2

Program explain concept like:

1) How after completion of static method the object created inside the block becomes un-referenced in Stack area. 

2) If any one referenced remain memory will not get cleaned.

Code:

package Atharva;

public class Garbage
{

static int a = 0;

@Override
public void finalize()
{
System.out.println((++a)+" Memory Cleaning By: "+Thread.currentThread().getName());
}

static void m1()
{
Garbage obj2 = new Garbage();
Garbage obj3 = new Garbage();
}

static Garbage m2()
{
Garbage obj4= new Garbage();
Garbage obj5 = new Garbage();
return obj5;
}

static Garbage m3()
{
Garbage obj6 = new Garbage();
Garbage obj7 = new Garbage();
return obj7;
}


public static void main( String args[] ) throws InterruptedException
{
Garbage obj1 = new Garbage(); // Used Memory /  Referenced Object Creation / Named Memory
new Garbage(); // UnUsed Objecy / UnReferenced / Anonymous memory

obj1 = null;
m1();
m2();
Garbage obj8 = m3();
obj8 = null;
System.gc();
Thread.sleep(1000);

System.out.println(" Program Ends ");
}
}

Output:

Code:

package Atharva;

public class Garbage
{

static int a = 0;

@Override
public void finalize()
{
System.out.println((++a)+" Memory Cleaning By: "+Thread.currentThread().getName());
}

Garbage obj;
     
public static void main( String args[] ) throws InterruptedException
{
Garbage obj1 = new Garbage(); // Used Memory
Garbage obj2 = new Garbage(); //  Referenced Object Creation
Garbage obj3 = new Garbage(); // Named Memory

obj1.obj = obj2;
obj2.obj = obj3;
obj3.obj = obj1;

obj1 = null;
obj2 = null;
obj3 = null;

System.gc(); 
Thread.sleep(1000);

System.out.println(" Program Ends ");
}
}

Output:

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