dynamic class loading in java

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dynamic class loading in java allows you to load classes at runtime rather than at compile time. this feature is useful for building applications that require flexibility, such as plugins, or for working with classes that are not available at compile time. java uses the `classloader` class to load classes dynamically.

key concepts

1. **classloader**: it is responsible for loading classes into the java virtual machine (jvm). java provides various class loaders, including the system class loader and custom class loaders.

2. **reflection**: java reflection allows you to inspect classes, methods, and fields at runtime. it can also be used to create instances of classes and invoke methods dynamically.

3. **jar files**: classes can be packaged into jar (java archive) files, which can be dynamically loaded.

steps for dynamic class loading

1. **create a class**: define a class that you want to load dynamically.
2. **compile the class**: compile the class into `.class` files or package it into a jar file.
3. **load the class dynamically**: use `classloader` to load the class at runtime.
4. **use reflection**: you can create an instance of the loaded class and invoke methods using reflection.

example code

step 1: create a class

let's create a simple class named `helloworld` that we will load dynamically.



step 2: compile the class

compile the class using the command line:



this will create a `helloworld.class` file.

step 3: dynamic class loading

now, let's create a main class that loads `helloworld` dynamically.



step 4: run the main class

compile the main class:



run the main class:



explanation of the code

1. **urlclassloader**: this class loader allows you to load classes from a specific url. in this case, we are pointing it to the directory where `helloworld.class` is located.

2. **loadclass**: the `loadclass` method is used to load the class by its fully qualified name.

3. **reflection**:
`getdeclaredconstructor().newinstance()`: th ...

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