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He have understood how to run a Java program.

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Why do we take a closer look at the program that we've written.

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The hello world application consists of two primary components.

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First the hello world class definition and the main method.

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Public class hello world is the first line of our Java program.

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Every Java application must have at least one class definition that consists of the class keyword followed

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by the class name and the code for each class appears between the opening and closing.

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Curly braces.

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Now we will discuss the subject of classes in further detail and so in the upcoming lectures.

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But right now it's just enough to know that every Java application begins with a class definition.

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Public static void main String args or arguments.

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So this is our next line in the program in the Java programming language.

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Every application must contain a main method whose signature is well just like that.

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Also will cover how to define a method in Java and the next upcoming lectures.

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And then finally line system dot out dot print.

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Hello world.

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So the print method prints the contents inside the double quotes into the console and inserts a new

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line after so it uses the system class from the core library of Java.

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Now don't worry if you don't get it at first we're going to learn a whole lot more about classes and

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methods in the next lectures.