Easy learning with example program codes

Hello world java program

As we have discussed all required detail to develop and execute a java program. Let us start java programming with first simple java program to print “Hello World”.

Create Hello world java program:

 * This program is used to print "Hello World".
 * @author CodesJava
public class HelloWorld {
      public static void main(String args[]){
            //This line will print "Hello World".
            System.out.println("Hello World.");


Hello World.

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To understand above java program better let us have a brief look on it:

1. class: is a keyword used to declare a class with specific name.

2. public: is an access modifier.

3. static: is a keyword which can be used with class, method, variable/constant , block. If it is used with a method that method is known as static method. For static method invocation no need for object creation , method will be associate with class.

4. void : return type of the method , void means it does not return any value.

5. main : method is invoked by JVM, as it is static no need to create an object. It represent the program’s startup.

6. String args[] : represents the array of String type which is used in command line arguments.

7. System.out.println():

1. System is a final class and its all members are static.

2. out is a public final static  member of System class. out is of PrintStream type.

3. println() is the method of PrintStream class.
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Programming language overview.
Overview of Java.
Java features
JVM architecture details.
Java Coding Guidelines.
Some important definitions.
Variable and data types.
Hello world java program.
Core java examples programs.
Important Java Programs.
How to set permanent path in java?
OOPs Basics.
Object and Class in Java.
OOPs Principles/Concepts.
Abstraction in java.
Encapsulation in java.
Polymorphism in java.
Method overloading in java.
Method overriding in java.
Dynamic method dispatch.
Runtime polymorphism.
Association in java.
Inheritance in java.
Aggregation in java.
Command line arguments in java.
Command line argument program in eclipse.
Read input from command line using Scanner.
Java array programs
Java star pattern programs
Java number pattern programs
final in java.
Abstract class in java.
Interface in java.
Custom marker Interface in java.
Constructor in java.
Package in java.
Access modifier in java.
Static import in java.
Package class in java.
this in java.
Instance initialize block.
Anonymous block.
super in java.
Static in java.
final in java.
Java cloning deep and shallow
Shallow vs Clone copy
String handling in java.
String handling programs.
StringBuffer in java.
StringBuilder in java.
Exception Handling Tutorial.
Multithreading Tutoial.
Java input output stream tutorial.
Collections framework in java tutorial.
Collections framework programs.
Java Random class
Java annotations.
Java design principles.
Java 7 features
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Java networking tutorial
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