• Menu
  • Skip to primary navigation
  • Skip to main content
  • Skip to primary sidebar

JavaBeat

Java Tutorial Blog

  • Java
    • Java 7
    • Java 8
    • Java EE
    • Servlets
  • Spring Framework
    • Spring Tutorials
    • Spring 4 Tutorials
    • Spring Boot
  • JSF Tutorials
  • Most Popular
    • Binary Search Tree Traversal
    • Spring Batch Tutorial
    • AngularJS + Spring MVC
    • Spring Data JPA Tutorial
    • Packaging and Deploying Node.js
  • About Us
    • Join Us (JBC)
  • Java
    • Java 7
    • Java 8
    • Java EE
    • Servlets
  • Spring Framework
    • Spring Tutorials
    • Spring 4 Tutorials
    • Spring Boot
  • JSF Tutorials
  • Most Popular
    • Binary Search Tree Traversal
    • Spring Batch Tutorial
    • AngularJS + Spring MVC
    • Spring Data JPA Tutorial
    • Packaging and Deploying Node.js
  • About Us
    • Join Us (JBC)

Mock Exams – GarbageCollection

3) Which of the following statements are true about the following program?

 package gc; import javax.swing.JButton; public class Ques01 { public static void main(String[] args) { JButton button = new JButton(); // Line A StringBuilder sb1 = getSB(); // Line B getSB(); // Line C button = null; // Line D } static StringBuilder getSB(){ return new StringBuilder(""); } } 
  1. The button object ‘button’ will become a candidate for garbage collection as soon the execution of Line A ends since the object is not used elsewhere.
  2. The newly created StringBuilder object as a result of method call in Line C becomes eligible for garbage collection.
  3. Even though the object pointed by the reference ‘button’ is set to null in Line D, the garbage collector, it is unsure that the Garbage collection reclaims the memory used by ‘button’.

Answer

3) b and c.

The object ‘button’ wont be eligible for Garbage Collection unless it is explicitly set to null or the method returns.

Primary Sidebar

Follow Us

  • Facebook
  • Pinterest

FEATURED TUTORIALS

np.zeros

A Complete Guide To NumPy Functions in Python For Beginners

What is new in Java 6.0 Collections API?

The Java 6.0 Compiler API

Introductiion to Jakarta Struts

What’s new in Struts 2.0? – Struts 2.0 Framework

JavaBeat

Copyright © by JavaBeat · All rights reserved
Privacy Policy | Contact