Object-oriented programming (OOP) is at the core of Java.
Encapsulation binds together code and the data it manipulates, and keeps both safe from outside interference and misuse. In Java, the basis of encapsulation is the class.
Inheritance is the process by which one object acquires the properties of another object. By use of inheritance, an object need only define those qualities that make it unique within its class. It can inherit its general attributes from its parent.
Polymorphism is a feature that allows one interface to be used for a general set of actions.
It refers to defining a skeleton of the class that should be implemented by its subclass. This can be achieved using abstract keyword in Java.
In
Java, all code must reside inside a class. Java program is basically a
text file with one or more class definitions. This text or source file
is called a compilation unit.
The Java compiler requires that a source file use the .java filename extension.
By convention, the name of the class should match by case the name of the file that holds the program.
All statements in Java end with a semicolon.
Java is a Strongly Typed Language
Every variable and every expression has a type, and every type is strictly defined.
All
assignments, whether explicit or via parameter passing in method calls,
are checked for type compatibility. The Java compiler checks all
expressions and parameters to ensure that the types are compatible. Any
type mismatches are errors that must be corrected before class
compilation.
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