finalize() method in Java with examples
In this tutorial, we are going to learn about the finalize method in Java with some examples.
finalize() method
Finalize is a method of an object class in which the garbage collector is called before destroying the object.
This method does not have any return type, it performs clean up activities.
The finalize method overrides to dispose of system resources, is also useful to minimize memory leak.
First Example
The code given below will explain the use of finalize method in Java.
When we take a string object and make it null then it will not call the finalize method.
public class finalizeMethod { public static void main(String[] args) { String str1 = new String("CS"); str1 = null; System.gc(); System.out.println("output of main method"); } protected void finalize() { System.out.println("output of finalize method"); } }
Output:- output of main method
EXAMPLE 2
But when we take the object of the class and make it null then, first it will call the main method after that it will call the finalize method.
public class finalizeMethod { public static void main(String[] args) { finalizeMethod str2 = new finalizeMethod (); str2 = null; System.gc(); System.out.println("output of main method"); } protected void finalize() { System.out.println("output of finalize method"); } }
Output:-
output of main method output of finalize method
Also read: toString() method in Java
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