First Java Program Hello World

June 9, 2015

 

For executing any java program we need given things.

• Install the JDK any version if you don’t have installed it.
• Set path of the jdk/bin directory.
• Create the java program
• Compile and run the java program

Steps For compiling and executing the java program

Java is very simple programming language first we write a java program and save it with program class name.
In below program we create a java program with “First” name so we save this program with “First.java” file name. We can save our java program anywhere in our system or computer.

 First program

class First
{
public static void main(String[] args)
{
System.out.println(“Hello World”);
System.out.println(“This Is My First Java Program”);
}
}
Compile and Run the Java Program Like this :
To compile: javac First.java
To execute: java First

During the program execution Time internally follows  This steps:

• Class loader subsystem loads or transfer the specified class into main memory(RAM) from secondary memory(hard disk)
• JVM takes the loaded class
• JVM looks for main method because each and every java program start executing from main() method.
• Since main() method of java is static in nature, JVM call the main() method with respect to loaded class

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