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Showing content from https://www.tutorialspoint.com/java/lang/object_finalize.htm below:

Java Object finalize() Method

The Java Object finalize() method is called by the garbage collector on an object when garbage collection determines that there are no more references to the object. A subclass overrides the finalize method to dispose of system resources or to perform other cleanup.

Following is the declaration for java.lang.Object.finalize() method

protected void finalize()

NA

This method does not return a value.

Throwable − the Exception raised by this method

The following example shows the usage of java.lang.Object.finalize() method. In this program, we've created a class ObjectDemo by extending GregorianCalendar class. In main method, finalize is called and object is made available for garbage collection.

package com.tutorialspoint;

import java.util.GregorianCalendar;

public class ObjectDemo extends GregorianCalendar {

   public static void main(String[] args) {
      try {
         // create a new ObjectDemo object
         ObjectDemo cal = new ObjectDemo();

         // print current time
         System.out.println("" + cal.getTime());

         // finalize cal
         System.out.println("Finalizing...");
         cal.finalize();
         System.out.println("Finalized.");

      } catch (Throwable ex) {
         ex.printStackTrace();
      }
   }
}

Let us compile and run the above program, this will produce the following result −

Sat Sep 22 00:27:21 EEST 2012
Finalizing...
Finalized.

java_lang_object.htm

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