Data Structure
Networking
RDBMS
Operating System
Java
MS Excel
iOS
HTML
CSS
Android
Python
C Programming
C++
C#
MongoDB
MySQL
Javascript
PHP
Physics
Chemistry
Biology
Mathematics
English
Economics
Psychology
Social Studies
Fashion Studies
Legal Studies
- Selected Reading
- UPSC IAS Exams Notes
- Developer's Best Practices
- Questions and Answers
- Effective Resume Writing
- HR Interview Questions
- Computer Glossary
- Who is Who
How many ways to call garbage collector (GC) in Java?
The garbage collection in Java is carried by a daemon thread called Garbage Collector(GC). Instead of waiting until JVM to run a garbage collector we can request JVM to run the garbage collector. There is no guarantee whether the JVM will accept our request or not.
In Java, we can call the garbage collector manually in two ways
- By using System class
- By using Runtime class
By using System class
System class has a static method gc(), which is used to request JVM to call garbage collector.
Example
public class SystemClassTest {
public static void main(String[] args){
SystemClassTest test = new SystemClassTest();
test = null;
System.gc();
}
public void finalize() {
System.out.println("Garbage collected");
}
}Output
Garbage collected
By using Runtime class
Runtime is a singleton class in Java and we can get a runtime object using the getRuntime() method. The gc() method is from Runtime class and it is an instance method.
Example
public class RuntimeClassTest {
public static void main(String[] args) {
RuntimeClassTest test = new RuntimeClassTest();
test = null;
Runtime.getRuntime().gc();
}
public void finalize() {
System.out.println("Garbage Collected");
}
}Output
Garbage collected
Updated on: 02-Jul-2020
1K+ Views
Advertisements