Java, from 1st code to expert programmer

Java is having a very interesting history along with various versions of java. Gradually a lots of feature were included in java over the time. I'll walk you with every version release and some of its key feature.

Write once and run everywhere!

Java architecture is a bit different from other programming languages. It converts code into an intermediate stage, rather then just converting into binary. Learn more about JVM i.e. Java Virtual Machine in this lecture.

There are a dozens of things that one need to take care while programming. This lecture will make your life easier while coding. Few shortcut tips are also included that will help you to fast code your snippets

Many times in your application, you want to take input from the user. In regular command line application, it is very easy to do so. But eclipse has a special place where you can keep those test arguments and use them again and again.

Lecture included to give you source code used during the teaching. Hope this will help you to edit the existing code but I recommend to write code from keyboard instead of copying it. It will help you to memorize syntax as well ag you will gain confidence.

Every programming language includes some datatypes to store different values. This lecture will help you to understand different datatypes available to a java programmer.

As the name suggest, Variables means that can vary. Creating variables in an essential part for every programmer and so is the case with java. This lecture will help you to understand the syntax of java variables.

Here we are only talking about the primitive types of number available in java, although complex class for number is also available but I want things to go gradually. First learn about the usual number and their usage in java programming language and latter we will learn from complex classes of numbers.

There are two type of conversion in Java. Converting smaller number to bigger value holding types of number and converting bigger value holding number to smaller value holding numbers. The second one is very tricky as it involves the risk to loose the original value.

Here we are only talking about the primitive types of characters available in java, although complex class for character is also available but I want things to go gradually. First learn about the usual character and their usage in java programming language and latter we will learn from complex classes of character.

Booleans are just true and false values. This lectures will help you to understand the usage of these two values in your code. there are some in built features to explore and utilize these boolean types, which are explained in the lecture.

Here we are only talking about the primitive types of string available in java, although complex class for string is also available but I want things to go gradually. First learn about the usual string and their usage in java programming language and latter we will learn from complex classes of string.

Access modifiers like public, private and protected are very useful and are used a lot in java. know more about them in detailed manner via this lecture

Java provides a number of access modifiers to set access levels for classes, variables, methods and constructors. The four access levels are:

• Visible to the package, the default. No modifiers are needed.
• Visible to the class only (private).
• Visible to the world (public).
• Visible to the package and all subclasses (protected).

Arithmetic operators are used in mathematical expressions. you will learn to implement the same via java codes in this lecture. This is one of the common and mostly used operation in java.

Many times we need to assign a value to a variable. This operation is known as assignment operation and for these operation a few operators are assigned. Learn more about these operators in this lecture.

A lot of time, we need to compare two values in programming to find the future way of our code. This is known as conditional programming, but the thing that decide the condition is relation like greater than, less than or may be equals or may be less than or equal. Such relations are discussed in this lecture

There are a few logical operations that you might have studied during your schools. operations like AND, OR and NOT are heavily used in programming languages and this lecture will help you to understand the the logical operations in detail.

Writing out long codes that keep on running is not the ultimate goal of programming. We need to find out a few condition, and only if those conditions meet out, we want to execute a certain block of code and if the condition is false, may be we want to run another block of code. all this happens via IF and IF ELSE keywords.

Switch and case are more easier than If else but serves a different role. When we want to check only a couple of conditions but cases can be many, then switch is preferred over the if else usage. this lecture is a walk through for switch case usage and break keyword.

A while loop is a control structure that allows you to repeat a task a certain number of times.

The syntax of a while loop is:

while(Boolean_expression)

{

Statements

}

A do while loop is similar to a while loop, except that a do...while loop is guaranteed to execute at least one time.

The syntax of a do...while loop is:

do

{

//Statements

}while(Boolean_expression);

A for loop is a repetition control structure that allows you to efficiently write a loop that needs to execute a specific number of times.

A for loop is useful when you know how many times a task is to be repeated.

The syntax of a for loop is:

for(initialization; Boolean_expression; update)

{

Statements

}

After Java 5, the enhanced for loop was introduced. This is mainly used for Arrays.

The syntax of enhanced for loop is:

for(declaration : expression)

{

//Statements

}

The break keyword is used to stop the entire loop. The break keyword must be used inside any loop or a switch statement.

The continue keyword can be used in any of the loop control structures. It causes the loop to immediately jump to the next iteration of the loop.

A Java method is a collection of statements that are grouped together to perform an operation. When you call the System.out.println method, for example, the system actually executes several statements in order to display a message on the console.

Methods can also be created with argument in them. The number of arguments that you wish is dependent on the programmer choice. There are couple of methods (...) (dot dot dot method) by which you can pass n number of arguments.

When a class has two or more methods by same name but different parameters, it is known as method overloading. It is different from overriding. In overriding a method has same method name, type, number of parameters etc.

Java comes with complex class for most the primitives types. The new complex class for number makes Numbers more powerful and creates new functionality in them. This lecture is a walk through for complex class of numbers.

Java comes with complex class for most the primitives types. The new complex class for character makes character more powerful and creates new functionality in them. This lecture is a walk through for complex class of character.

Java comes with complex class for most the primitives types. The new complex class for string makes string more powerful and creates new functionality in them. This lecture is a walk through for complex class of string.

You cannot edit a string once you have saved in complex class. It would like like you have done nothing wrong in the syntax and even compiler will also not complain. But internally you are using much more memory, then you should be using. Use StringBuilder class to deal with problem at initial stage.

Date is a complex object in Java. In fact, date is so much used that there are many separate classes for date. One of the them is Gregorian calendar. Although it has calendar in its name but it is used for Time formating and extending time display usage.

ava provides a data structure, the array, which stores a fixed-size sequential collection of elements of the same type. An array is used to store a collection of data, but it is often more useful to think of an array as a collection of variables of the same type.

Instead of declaring individual variables, such as number0, number1, ..., and number99, you declare one array variable such as numbers and use numbers[0], numbers[1], and ..., numbers[99] to represent individual variables.

The ArrayList class extends AbstractList and implements the List interface. ArrayList supports dynamic arrays that can grow as needed.

Standard Java arrays are of a fixed length. After arrays are created, they cannot grow or shrink, which means that you must know in advance how many elements an array will hold.

Array lists are created with an initial size. When this size is exceeded, the collection is automatically enlarged. When objects are removed, the array may be shrunk.

The HashMap class uses a hashtable to implement the Map interface. This allows the execution time of basic operations, such as get( ) and put( ), to remain constant even for large sets.

An exception is a problem that arises during the execution of a program. An exception can occur for many different reasons, including the following:

• A user has entered invalid data.
• A file that needs to be opened cannot be found.
• A network connection has been lost in the middle of communications
• The JVM has run out of memory.

To deal up all these and many other such exception, we will learn exception handling in this lecture.

Before you can catch an exception, some code somewhere must throw one. Any code can throw an exception: your code, code from a package written by someone else such as the packages that come with the Java platform, or the Java runtime environment. Regardless of what throws the exception, it's always thrown with the throw statement.

Objects are key to understanding object-oriented technology. Look around right now and you'll find many examples of real-world objects: your dog, your desk, your television set, your bicycle.

In the real world, you'll often find many individual objects all of the same kind. There may be thousands of other bicycles in existence, all of the same make and model. Each bicycle was built from the same set of blueprints and therefore contains the same components. In object-oriented terms, we say that your bicycle is an instance of the class of objects known as bicycles. A class is the blueprint from which individual objects are created.

Different kinds of objects often have a certain amount in common with each other. Mountain bikes, road bikes, and tandem bikes, for example, all share the characteristics of bicycles (current speed, current pedal cadence, current gear). Yet each also defines additional features that make them different: tandem bicycles have two seats and two sets of handlebars; road bikes have drop handlebars; some mountain bikes have an additional chain ring, giving them a lower gear ratio.

The dictionary definition of polymorphism refers to a principle in biology in which an organism or species can have many different forms or stages. This principle can also be applied to object-oriented programming and languages like the Java language. Subclasses of a class can define their own unique behaviors and yet share some of the same functionality of the parent class.

There are thousands of classes already, waiting for you to use them. But still when we design our application, we need to create our own classes. This lecture will help you to understand about creation of custom classes

Java recommends to keep every file in some kind package and usage of default package is discouraged. This lecture will teach you manage packages. Creating new packages as well as managing already existing files in packages with the help of IDE

Methods in java can be static or can be instance. This lecture is a guide to create instance methods from seperate classes.

Constructors are the methods with same name and even if you don't create constructor, JVM will create one for you. Learn to overload a constructor and using getter and setter methods in java.

Inheritance means acquiring functionality of previous class into the new class. this is done using extend keyword. this lecture is a full walk through for the usage of such case

methods from class have their own functionality. If you want to call those methods in sub class then you can use super keyword. But Java gives you the ability to modify those classes. this is known as method overriding.

Interactive application should have the ability to take input from the user. there a lots of method by which you can take input from user. This small application show to take input from user and also to stop the application from taking input from the user without making the application cold or close.

To work with data that can be saved on disk, we need to work with classes that can read and write files on disk. This lecture will help you to write data in files as well as read data from files.

We are trying to built a small application that can give us details of any directory and in a separate app, we have used the libraries to show that current library of the users.

Application of java is extending and there are libraries that can parse Network files and display data from it. Such a demonstration is given using this application in this lecture.

Client or end user expect programmer to deliver the final jar file, which is a java archive file. This lecture will help you to understand the way to export your project as a jar file

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