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## JAVA LANGUAGE BASICS

It is said that the best way to learn swimming is to jump into the water right away. Similarly, the best way to learn a programming language is to start coding straight away. Let us start our study of Java programming in an informal way. Let us write a simple Java program and run it.

#### 3.1 Introduction

In our first Java program, we will find the area of a circle with radius 5.

Problem: Write a program to find area of a circle with radius 5.

Solution: See Program 3.1.

PROGRAM 3.1 Area of a Circle

` //    first.java`

` class first`

`  {`

` public static void main( String args[] )`

`  {`

`   int r ;`

`   r = 5 ;`

`   System.out.println(3.14 * r * r);`

`  }`

` }`

If you run the program, you will get the following output.

Output

` 78.5 ...`

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