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4/20/2017 Java Basic Syntax https://www.tutorialspoint.com/cgi-bin/printpage.cgi 1/5 Java - Basic Syntax https://www.tutorialspoint.com/java/java_basic_syntax.htm Copyright © tutorialspoint.com When we consider a Java program, it can be defined as a collection of objects that communicate via invoking each other's methods. Let us now briefly look into what do class, object, methods, and instance variables mean. Object − Objects have states and behaviors. Example: A dog has states - color, name, breed as well as behavior such as wagging their tail, barking, eating. An object is an instance of a class. Class − A class can be defined as a template/blueprint that describes the behavior/state that the object of its type supports. Methods − A method is basically a behavior. A class can contain many methods. It is in methods where the logics are written, data is manipulated and all the actions are executed. Instance Variables − Each object has its unique set of instance variables. An object's state is created by the values assigned to these instance variables. First Java Program Let us look at a simple code that will print the words Hello World . Example public class MyFirstJavaProgram { /* This is my first java program. * This will print 'Hello World' as the output */ public static void main(String []args) { System.out.println("Hello World"); // prints Hello World } } Let's look at how to save the file, compile, and run the program. Please follow the subsequent steps − Open notepad and add the code as above. Save the file as: MyFirstJavaProgram.java. Open a command prompt window and go to the directory where you saved the class. Assume it's C:\. Type 'javac MyFirstJavaProgram.java' and press enter to compile your code. If there are no errors in your code, the command prompt will take you to the next line .
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