What happens when class is loaded?

What happens when class is loaded?

After class loading, initialization of the class takes place which means initializing all static members of the class. 2) a static method of a class is invoked. 3) a static field of Class is assigned. 4) a static field of a class is used which is not a constant variable.

What is meant by loading a class?

Java ClassLoader is used to load the classes at run time. In other words, JVM performs the linking process at runtime. Classes are loaded into the JVM according to need. If a loaded class depends on another class, that class is loaded as well. When we request to load a class, it delegates the class to its parent.

Which class defines how classes are loaded?

The application class loader loads the class where the example method is contained. An application or system class loader loads our own files in the classpath. Next, the extension one loads the Logging class. Extension class loaders load classes that are an extension of the standard core Java classes.

Which ClassLoader is used to load a class?

Extension ClassLoader: The Extension ClassLoader is a child of Bootstrap ClassLoader and loads the extensions of core java classes from the respective JDK Extension library. It loads files from jre/lib/ext directory or any other directory pointed by the system property java.

How do you load a class?

To load a class, a class definition should be available in the CLASSPATH and JVM can load it.

1. Reference the class name in code. The class will be loaded when JVM find the class available in the classpath.
2. Using Class. forName(String), to load and initialize the class.
3. ClassLoader.
4. Overloaded Class.forName()

When is a static variable loaded in Java?

The static fields are loaded when the class is loaded. This usually happens which the file object of a class is created, but it can be earlier if the class is used another way. The static initialiser is thread safe and you can access the class in multiple threads safely.

Can a class be loaded more than once in Java?

Note: the class can be loaded (and its static intialisation block run) more than once if multiple class loaders are used. Generally, loading the same class in multiple class loaders can be confusing and is avoided, but it is supported and does work.

Can you invoke static variables without creating an object?

You can invoke them without creating an object. (using the class name as reference). There is only one copy of the static field available throughout the class i.e. the value of the static field will be same in all objects.