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Commit 092d10f

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Update README.md
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‎README.md

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## Q. How bootstrap class loader works in java?
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Bootstrap ClassLoader is repsonsible for loading standard JDK classs files from **rt.jar** and it is parent of all class loaders in java. There are three types of built-in ClassLoader in Java:
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Bootstrap **ClassLoader** is repsonsible for loading standard JDK classs files from **rt.jar** and it is parent of all class loaders in java.
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There are three types of built-in ClassLoader in Java:
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**1. Bootstrap Class Loader:** It loads JDK internal classes, typically loads rt.jar and other core classes for example java.lang.* package classes
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**1. Bootstrap Class Loader** – It loads JDK internal classes, typically loads rt.jar and other core classes for example java.lang.* package classes
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**2. Extensions Class Loader:** It loads classes from the JDK extensions directory, usually $JAVA_HOME/lib/ext directory.
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**2. Extensions Class Loader** – It loads classes from the JDK extensions directory, usually $JAVA_HOME/lib/ext directory.
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**3. System Class Loader** – It loads classes from the current classpath that can be set while invoking a program using -cp or -classpath command line options.
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**3. System Class Loader:** It loads classes from the current classpath that can be set while invoking a program using -cp or -classpath command line options.
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```java
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/**
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* ClassLoader
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*/
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import java.util.logging.Level;
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import java.util.logging.Logger;
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/**
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* Java program to demonstrate How ClassLoader works in Java
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*
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**/
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public class ClassLoaderTest {
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public static void main(String args[]) {
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try {
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//printing ClassLoader of this class
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System.out.println("ClassLoader : "+ ClassLoaderTest.class.getClassLoader());
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try {
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//printing ClassLoader of this class
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System.out.println("ClassLoader : "+ ClassLoaderTest.class.getClassLoader());
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//trying to explicitly load this class again using Extension class loader
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Class.forName("Explicitly load class", true
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, ClassLoaderTest.class.getClassLoader().getParent());
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// trying to explicitly load this class again using Extension class loader
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Class.forName("Explicitly load class", true, ClassLoaderTest.class.getClassLoader().getParent());
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} catch (ClassNotFoundException ex) {
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Logger.getLogger(ClassLoaderTest.class.getName()).log(Level.SEVERE, null, ex);
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}
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}
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}
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```
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<div align="right">
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<b><a href="#related-interview-questions">↥ back to top</a></b>
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</div>

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