10 Never Avoid Features of Core Java For Learners

by Ravi Bhadauria ADMEC Multimedia Institute

Core Java is a part of Java which is also considered as Standard Edition of Java It is also known as the base for advanced Java. For example, we need characters to form sentences similarly we are required to learn core Java to learn Advanced Java. You can not learn advanced Java without knowledge of core Java as you can see in the previous example. It covers all the basic concepts used in Java. By using the concepts of core Java, Anyone can develop a standalone application. It is a very secure language and simple to learn. This language is also used to do the back-end programming for Android applications. This is the overview of Java that what it is and where it will be used so now come back to the point and know about important features or concepts. Java language has many features but now we will discuss those features of core Java which should never be avoided by a learner.

Never Avoid Features of Core Java for Learners and Students

1. Loops

At the top, we have loops which are one of the important features of core Java. Loops repeat itself until the condition become false. Execution of loop depends on the condition if the condition is true then loop repeats all the statements which specified in its body. Without using the loop, coding becomes very complex and lengthy. There are four loops in Java named as for, while, do while () and a newly introduced loop named foreach, which is used to extract or access the elements of the array.

2. Object-oriented Features

This feature is the main feature of Java. It is a language which is object-oriented, means it allows us to use the classes and objects. Other than Classes and objects, it allows many more features to use like abstraction, Polymorphism, Inheritance etc. which makes the data secure.

3. Method Overloading

Method overloading is basically overloading of a method which is an example of Polymorphism. It means you can create methods with the same name in the same class but with different arguments or parameters. Method overloading is used to achieve the benefits of Polymorphism. We can overload the method within the same class. It depends on the two facts and that are: Sequence of parameters and number of arguments. The main method of Java can also be overloaded.

4. Inheritance

Inheritance is one of the concepts of an object-oriented approach which follows the concept of parent-child relationship. It is used to reuse the code which already exists in any class or program. Java does not support the multiple inheritances to avoid the complexity of the program. In Java, we can inherit any class using a keyword named "extends". There are two approaches to inherit the class and i.e. Has a relationship and is a relationship. Is-a relationship is followed by using the keyword extends. Has-a relationship can be followed by the creation of class in other class.

5. Methods

Methods are also known as a function in another language like C and C++. Methods are the main topic in every programming language. Declaration and definition of methods are very easy. The method contains the statements which can be executed by calling it by using its name and parameters.

Syntax of Method

return type method name (arguments) {Scope/body}

To create a method you can use any of the class which is predefined or defined by you. It is not necessary to take the return type like data types. You can also give the user-defined class name as the method name.

6. Interface

The interface is similar to classes. An interface provides the pure abstraction functionality. We can not write a method with the body in an interface. We can include variables and methods in Interface which are public and abstract by default. We can use interfaces in any program by using a keyword and i.e. implements.

7. Type Casting

Typecasting is the conversion of one type to another type. This conversion may be between two data types or may be the conversion of objects. There is a term called the dynamic building, this term is used to define the typecasting of objects. We can typecast the objects when we are using the inheritance. We can also achieve dynamic binding by using Method Overriding.

8. Access Specifier

Access specifiers specify the scope of access. Different Access specifiers are used in Java according to required strictness for access. Access specifiers are private, public, protected, default.

9. Encapsulation

It is a concept of the object-oriented approach which is used for wrapping up the methods and data in a single unit. By using the encapsulation, we can secure the data. By using this, outsiders can not change the code easily. The class is an example of encapsulation because it combines data member and member functions in a single unit and that is class. Data hiding is also can achieve by using encapsulation.

10. JDBC Connection

At the last in the queue, we have JDBC which is a Java Database Connectivity. It is an API(Application Program Interface) which was written in Java which is secure. It is used to make the connectivity with the database. It is necessary to know because it is required whether we make a standalone application or web application.

These are some essential features which will never be avoided by learners. Java is a secure language and a right choice to make a career in it. Advanced Java is also compulsory to create an application which is available on the web.

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