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How does a ClassLoader work in Java?
A Java Class is stored in the form of byte code in a .class file after it is compiled. The ClassLoader loads the class of the Java program into memory when it is required. The ClassLoader is hierarchical and so if there is a request to load a class, it is delegated to the parent class loader.
The types of ClassLoader in Java are given as follows
- Bootstrap ClassLoader
- Extensions ClassLoader
- System ClassLoader
Example
public class ClassLoaderTest {
public static void main(String[] args) {
System.out.println("class loader for this class: " + ClassLoaderTest.class.getClassLoader());
System.out.println("class loader for DNSNameService: " + sun.net.spi.nameservice.dns.DNSNameService.class.getClassLoader());
System.out.println("class loader for HashMap: " + java.util.HashMap.class.getClassLoader());
}
}Output
class loader for this class: sun.misc.Launcher$AppClassLoader@73d16e93 class loader for DNSNameService: sun.misc.Launcher$ExtClassLoader@70dea4e class loader for HashMap: null
Updated on: 03-Jul-2020
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