Why do we use wrapper classes in Java?

Wrapper class in java provides the mechanism to convert primitive into object and object into primitive. wrapper classes are used to convert primitive values to java objects i.e; wrapper objects . it means wrapps up around a datatype and gives it a object apperence.

In this way, how many class loaders are there in Java?

There are three types of built-in ClassLoader in Java: Bootstrap Class Loader – It loads JDK internal classes, typically loads rt.jar and other core classes for example java.lang.* package classes. Extensions Class Loader – It loads classes from the JDK extensions directory, usually $JAVA_HOME/lib/ext directory.

What is a bootstrap class loader?

Answer : When a JVM starts up, a special chunk of machine code runs that loads the system classloader. This machine code is known as the Bootstrap / Primordial (or sometimes - Null) classloader. It is not a Java class at all, as are all other classloaders.

What is the use of extension class loader?

The extension framework makes use of the new class-loading mechanism in the JavaTM 1.2 platform. Bootstrap classes: the runtime classes in rt.jar and internationalization classes in i18n.jar. Installed extensions: classes in JAR files in the lib/ext directory of the JRE.

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