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There are two types of modifiers in java: access modifier and non-access modifier. The access modifiers specifies accessibility (scope) of a datamember, method, constructor or class. There are 4 types of access modifiers: There are many non-access modifiers such as static, abstract, synchronized, native, volatile, transient etc. Here, we will learn access modifiers.

A package is a group of similar types of classes, interfaces and sub-packages. Package can be categorized in two form, built-in package and user-defined package. There are many built-in packages such as java, lang, awt, javax, swing, net, io, util, sql etc. Here, we will have the detailed learning of creating and using user-defined packages.

An interface is a blueprint of a class. It has static constants and abstract methods. The interface is a mechanism to achieve fully abstraction in java. There can be only abstract methods in the interface. It is used to achieve fully abstraction and multiple inheritance in Java. Interface also represents IS-A relationship.

The instanceof operator is used to test whether the object is an instance of the specified type (class or subclass or interface). The instanceof operator is also known as type comparison operator because it compares the instance with type. It returns either true or false.

The final keyword in java is used to restrict the user. The final keyword can be used in many context. Final can be: variable method class The final keyword can be applied with the variables, a final variable that have no value it is called blank final variable or uninitialized final variable.

super keyword. The super is used to refer the immediate parent class object. There are three usage of super. Let's see:

In this page, we will learn how to write the hello java program. Creating hello java example is too easy. Here, we have created a class named Simple that contains only main method and prints a message hello java. It is the simple program of java.

There can be a lot of usage of this keyword. In java, this is a reference variable that refers to the current object. Usage of this keyword Here is given the 6 usage of this keyword. this keyword can be used to refer current class instance variable.

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