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ClassLoader

ClassLoader is responsible for finding and loading class file at run time.ClassLoader class is located in java.lang package.we can subclass it to our functionality for class loading

Whenever a new JVM is started ,
> Bootstrap class loader is responsible for loading java classes like java.lang.Object and other runtime code into memory first.Runtime classes are in rt.jar file
>next comes java extension class loader(path java.ext.dirsExtClassLoader).
here we can place our .jar files since it will be loaded automatically when jvm starts
>lastly ,AppClassLoader which will load classes kept in the java.class.path System property

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