Help the world stop coronavirus! Stay home!

Prev Next

Java / Object, Class and Package

What are the rules of class initialization in Java?

Classes are initialized from top to bottom fashion so that fields declared on top initialized before field declared in bottom.

Super Class is initialized before Sub Class or derived class is initialized in Java.

If Class initialization is triggered due to the access of a static field, only Class which has declared static field is initialized and it doesn't trigger initialization of super class or sub class even if static field is referenced by type of Sub Class, Sub Interface or by implementation class of interface.

interface initialization in Java doesn't cause super interfaces to be initialized.

static fields are initialized during static initialization of class while non static fields are initialized when instance of class is created. It means static fields are initialized before non static fields in Java.

non static fields are initialized by constructors in Java. sub class constructor implicitly call super class constructor before doing any initialization, which guarantees that non static or instance variables of super class is initialized before sub class.

❤Cash Back At Stores you Love !!!❤

Earn your $10 reward when you make your first purchase through Ebates by signing up with clicking below button.

Ebates Coupons and Cash Back

More Related questions...

Can a Java source file have more than one class declaration? How to implement cloning? Object Cloning. Example of a final class in Java API. What is the data type of System.out? Can we have two classes with same name under the same package? Can we have class name same as the interface name under the same package? What is the base class of all classes? Could a Java class file exists even without filename and only extension(.java)? Anonymous class. Difference Between ClassNotFoundException & NoClassDefFoundError. ClassNotFoundException Example. Dynamic class loading. Difference: Class.forName() vs ClassLoader.loadClass(). Which class implements clone method- Cloneable or Object in Java? Why Custom ClassLoader is required in Java? How does Java ClassLoader Work? When are class static variables loaded in memory in Java? Describe the principle of Java class loader. When a class is loaded in Java? When a class is initialized in Java? What are the rules of class initialization in Java? What is a Local class in Java? Different type of cloning in Java. Explain Shallow copy in Java. Explain deep copy in Java. Difference between shallow and deep copy in Java. What is Serialization in Java? Explain De-serialization in Java. Difference between readObject and readResolve in Java serialization. Why is Class.newInstance() is discouraged to use? Difference between Static block and initializer block in Java. What is static class in Java? Role of Runtime and System class in Java. Can an anonymous class have constructor? What are the Object class methods? Can you override Object class getClass method? When shallow object copy is preferred? How to implement equals method correctly? Good implementation of hashCode method in Java. Java equals() vs. compareTo() contract. Can two objects which are not equal have the same hashCode? What happens when equals() is not consistent with compareTo() method? Difference between instanceof and getClass() method for checking type inside equals.
Show more question and Answers...

Variable

Comments & Discussions