Why Donot finalize method run?

[Gowher Naik]

public class Test {
public void finalize(){
System.out.println("gc");
}
  static Integer x;
  public static void main(String argv[]){
  for(int i=0;i<10;i++){
  x=new Integer("10");
    }
  System.gc();
  }
}

In above code the finalize method donot run
i am not able to understand why.

Thanks

[Barry Gaunt]

You have implemented finalize in your Test class. You do not create an instance of your Test class. So no instance of the Test class needs to be garbage collected (or rather, is eligible for garbage collection)

[Gowher Naik]

But there are Integer objects inside for loop which should be garbage collected.

[Awais Sheikh]

Hello,
Finalize method is called when object of a class is created and completes its work, but remember finalize method should in the class whose garbage it has to be collect.
In your code you implemented in the test class, but no where object of Test class is created so this finalize method will not called by gc. new Interger is calling finalize method of Integer class not Test class. Try the code below hope it will clear you.

public class Test 
{
protected  void finalize()
{
System.out.println("gc1");
}  
static int x;  
public static void main(String argv[])
{  
for(int i=0;i<10;i++)
{  
x=new Integer("10"); 
Test t=new Test();
Test1 h=new Test1(x);
}  

System.gc();  


}

}
class Test1
{
Test1(int i){}
Test1(){}
public  void finalize()
{
System.out.println("gc");
}  
}

Thanks

[Gowher Naik]

Thanks Awais Sheikh
Now i understood it.