Introduction, Simple Java Program, More of Java, An application With Two classes

1. OVERVIEW OF
LANGUAGE

2. Contents
• Introduction
• Simple Java Program
• More of Java
• An application With Two classes

3. Introduction
• JAVA is a general purpose object oriented
language.
• We can develop two types of JAVA
programs:-
• Stand-alone Application:- these are java
programs that are used to carry out a certain
task at a stand- alone local computer.
• Web Applets:- Web applets are the small java
programs used to develop web applications.

4. Introduction continue..
• Executing a Stand- alone application involve two
steps
• Compile the source code into byte code(javac compiler).
• Executing the byte code program(java interpreter).
• Executing a Web Applets also involve two steps
• Compile the source code into byte code(javac compiler).
• Executing the byte code with java enabled browser.

5. Simple Java Program
• Let us look at a simple code that would
print the words Hello World.
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
}
}

6. Simple Java Program
• Let us look at a simple code that would
print the words Hello World.
public class MyFirstJavaProgram  Class Declaration
{
/* 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
}
}

7. Simple Java Program
• Let us look at a simple code that would
print the words Hello World.
public class MyFirstJavaProgram  Class Declaration
{  Opening Brace
/* This is my first java program.
This will print 'Hello World' as the output */
public static void main(String []args)
{
System.out.println("HelloWorld");//prints HelloWorld
}
}

8. Simple Java Program
• Let us look at a simple code that would
print the words Hello World.
public class MyFirstJavaProgram  Class Declaration
{  Opening Brace
/* This is my first java program.
This will print 'Hello World' as the output */
public static void main(String []args)  the main line
{
System.out.println("HelloWorld");//prints HelloWorld
}
}

9. Simple Java Program
• Let us look at a simple code that would
print the words Hello World.
public class MyFirstJavaProgram  Class Declaration
{  Opening Brace
/* This is my first java program.
This will print 'Hello World' as the output */
public static void main(String []args)  the main line
{
System.out.println("HelloWorld");//prints HelloWorld  output line
}
}

10. More of java
import java.lang.Math;
public class Exercise
{
public static void main(String[] args)
{
double x = 16;
double y;
y= Math.sqrt(x);
System.out.println("The square root of " +y);
}
}

11. More of java
import java.lang.Math;
public class Exercise
{
public static void main(String[] args)
{
double x = 16;
double y;
y= Math.sqrt(x);  math function
System.out.println("The square root of " +y);
}
}

12. An application With Two
classes
class Room
{
float length;
float breadth;
void getdata(float a, float b)
{
length= a;
breadth= b;
}
}

13. Continue..
class RoomArea
{
public static void main(String args[])
{
float area;
Room room1= new Room (); //creates an object room1
room1.getdata(14,10);//assign value to length and breadth
area = room1.length * room1.breadth;
System.out.println(“Area =”+area);
}
}