INTRODUCTION
============

UI DEVELOPMENT

WHAT IS THE UI?
==============

APPLICATION
==========
A COLLECTION OF PROGRAMS

PHONE ==> ANDROID/IOS ==> MOBILE BASED OS
	WHATSAPP, INSTAGRAM, SNAPCHAT ETC.

SOFTWARE
========
COLLECTION OF PROGRAMS

HOW THE APPLICATION WORK?
TYPES OF APPLICATIONS
======================
	THREE TYPES:
		1) WEB APPLICATIONS
			CAN BE ACCESSES BY MORE THAN ONE USER AT A TIME
			WE NEED: INTERNET, BROWSER
			EX: YOUTUBE, GMAIL, AMAZON ETC.
		2) DESKTOP APPLICATIONS
			CAN BE USED BY ONLY ONE PERSON
			CAN RUN ON: WINDOWS, LINUX, MAC-OS
			EX: NOTEPAD, MS-PAINT, CALCULATOR
		3) DISTRIBUTED APPLICATIONS
			CAN USE BY MORE THAN ONE USER.
			
			PHONEPE: CHECK BALANCE
					UPI =======> BANK APPLICATION
SYNTAX
======
	set of guidelines
		which can describe the way to write an instruction.
INSTRUCTION
ERROR
=====
	the program will be get exited/stopped while running because of the error.
	the program with wrong syntax ==> error

TYPES OF ERRORS
================
	1) compile time error
	2) run time error

TECHNOLOGIES

System.out.println(100);

int a = 123;
int b = 123.234f;

import java.util.Scanner;

main()
{
	Scanner obj = new Scanner(System.in);
	int a = obj.nextInt();	// 123.234f
}

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