Java Tutorial

Introduction

This tutorial is about creating simple calculator which performs only four operations. For creating a simple Calculator we require two JTextFields where the user can enter two numbers, four JButton for four operations namely addition, subtraction,multiplication and division, a JLabel for displaying the result.

Implementation

Step 1: Creating a class which extends JFrame because we are going to create an Application. After this we have to define the constructor of the class as follows. Super() is used to give title to the frame.

Introduction In this tutorial, a simple Paint program is created, which enables us to draw anything to screen. It's a basic program to understand the logic behind creating a paint program. Here main concept is implementing MouseMotionListener which handles mouse events. Whenever mouse is dragged a mouse event is sent to Java which finds the event listener in the program in order to take any action. We need to implement only mouseDragged() of many functions of MouseMotionListener class to draw to the Panel.

Our programs reside on Hard Disk. Every program is brought into Main memory(RAM) for execution. Variables, Objects are runtime entity which means they are saved in RAM. Once you run the Program, variables, objects come into existence but once we close our program they are deleted from the Main Memory. In order to save the state(instance variable) of objects they must be saved on Secondary Memory(Hard Disk). Following are steps for serializing(saving) the objects.

Introduction: In this Tutorial, creation of clock which updates every second is explained. Here we create an Application for clock. It shows Hour, minutes and seconds which updates every second. Main Idea: The Dynamic clock can be created using Java's Timer thread but here we will see how to use our own thread and accomplish the task. This tutorial can clear any doubts you have in Java Threads.

By following this two-part video guide you'll easily create a simple event calendar in pure Java. In the end you’ll get a nice-looking web calendar with a drag-and-drop UI, basic calendar views (day, week, month) and functionality.

Hi everyone, this simple tutorial will teach you on how to create a simple submit validation with yes or no option. This is a simple tutorial that consist a few line of code.

This tutorial will teach you o how to auto calculate textbox using combo box onchange event. For thus creating online ordering system, you can use this code to integrate in your system.

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