CODEWITHSUNDEEP
javaobjectlifecycle
Wonjung Kim
Wonjung Kim

Reputation: 1933

How to know when an object is deallocated in Java?

I want to know when an object is deallocated in Java?

If there is a something like deinit in Swift, I can release some resources at there. ex)

deinit {
     myResource1.dispose()
     myResource2.release()
     someOtherResource.close()
     ....
}

Is it a bad practice in Java, so that I have to find another way?

Specifically, I want to know when a row in a list view dies.

Upvotes: 2

Views: 3609

Answers (2)

Rahman
Rahman

Reputation: 3795

Employee class :

class Employee {
    public int id;

    public Employee(int id) {
        // TODO Auto-generated constructor stub
        this.id = id;
    }

    @Override
    protected void finalize() throws Throwable {
        // TODO Auto-generated method stub
        super.finalize();
        System.out.println(this.id + " Garbage Collected");
    }
}

MainClass :

public class TestMain  {
public static void main(final String[] args) throws ParseException {
    Employee p = new Employee(111);
    Employee p2 = new Employee(222);
    p = null;
    p2 = null;
    System.gc();
}

}

N.B : Though its not sure whether garbage collector will be called or not even if we call gc() method

Upvotes: 1

Suresh Atta
Suresh Atta

Reputation: 122018

Unlike constructors, there are no destructors or de-init in Java. When the instance is no more reachable (no more references to the object), it will automatically Garbage collects by JVM.

You can try implementing finalize() method in your Class.

Called by the garbage collector on an object when garbage collection determines that there are no more references to the object.

Upvotes: 2

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