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First of all, you should read a bit on how to start a Swing application. You must take care of the Event Dispatcher Thread when starting your application. And, because of the way AWT manage threads, you don't need this infinite loop that will just take resources for nothing. The main thread will stay active until your frame is closed[1].

For the GUI, it is always a good idea to extract your components. You can create other classes, inner classes or factory methods to distinct your TextPanelButtonsPanel and the frame itself.

Keep in mind the single responsibility principle. The ButtonsPanel is the most complex part of your view. The buttons loop and the event handling should be improved. Let's start with the deepest for. Did you know that you can set one actionCommand on a JButton this will be useful to assign one value to one button and drop the loop inside the event handling.

But there is better, you can create your own action or button to clearly expose this aspect. To improve your code readability you can also introduce some constants for the special buttons.

By doing that you remove the comparison on array indexes and have a code that start to be auto documented. At this time you can notice that most of your logic is into this ButtonsPanel.

Create a simple calculator using Java Swing

This is not a good thing because testing it is not easy and this class mixes presentation and logic. The de-facto pattern for Swing is MVC, you have already noticed that all existing components are using listeners. And you can do the same.

swing java calculator

Create one listener that will be used by your Gui to be notified when one button is pressed. In the meantime, if you are using Java 9 or bigger, you can use a switch expression to replace your ifs. While this is still better, in my opinion, you are still exposing too much details onf your ButtonsPanel what if you want to use icons instead of String.

The ButtonsListener should have dedicated method for the special symbols. By doing that you will move the interpretation of the symbols back to the ButtonsPanel.

Another improvement that you can do is create a class for all your buttons with a callback to trigger the correct method on the listener.This is a free Java calculator tutorial developed using Java Swing.

Below you will find the java code for calculator along with the screenshot. It is a basic four-function calculator java program source code. The calculator that we build will look like:. Used Jmenu for File and help. Created a class to respond to the events caused by numbers, functions, exit, help and about functionality.

A BorderLayout lays out a container, arranging and resizing its components to fit in five regions: north, south, east, west, and center. The calculator that we build will look like: Java simple calculator 1. Used JButton for the numbers and functions. B Website: wwww.

swing java calculator

BorderLayout ; import java. Color ; import java. Container ; import java. FlowLayout ; import java.

How to Create Calculator in Eclipse with Java Program

Font ; import java. GridLayout ; import java. Window ; import java. ActionEvent ; import java. ActionListener ; import java. KeyEvent ; import java.

WindowAdapter ; import java. WindowEvent ; import javax. JButton ; import javax. JDialog ; import javax. JFrame ; import javax. JLabel ; import javax. JMenu ; import javax. JMenuBar ; import javax. JMenuItem ; import javax. JPanel ; import javax. JTextArea ; import javax. WEST ; jplMaster. EAST ; jplMaster.Get a Competitive Website Solution also Ie.

Hackerrank Solutions and Geeksforgeeks Solutions. Follow Me. So you will get email everytime we post something new here. As we know that calculator program should perform some basics operation such as Addition, Subtraction, Multiplication, and division using Plus, Minus, Multiply and Division operators present in our keyboard. Addition Subtraction Multiplication division The list of operation of the task will be performed by the total 16 buttons and one text view area or result view window.

These sixteens buttons are ten number buttons, four operator buttons, one dot buttons and one equal button. How to Run Java Applet Program First, you need to download or copy-paste the program to any text editor you have, after that you need to save the program as " calculator. If you do not make any changes as suggested in the below you will get an error " applet is not initialized ". Both are shown in the below example.

The Applet is Not Initialized If you are facing this issue make sure that your program class name and applet code in the program with a comment and the program save with the same name. I have saved the below code as " calculator. Note: Name is case sensitive so before renaming make sure the all the changes are same. Please read how to run a java applet program for more information. I have explained all the things in details with pictures. Button button1,button2,button3,button4,button5,button6,button7,button8,button9,button0.

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swing java calculator

Create a given table in HTML. Create an HTML file to link to different html page which contains images, tables. How to Solve:- So in this problem, we have to Problem:- Write an applet program in Java that display Random dot in screen or An applet program that displays random dot or Draw Dots at RCalculator app created with Java Swing, It is simple with an easy code to help novices learn how to operate a calculator. Work fast with our official CLI. Learn more. If nothing happens, download GitHub Desktop and try again.

If nothing happens, download Xcode and try again. If nothing happens, download the GitHub extension for Visual Studio and try again. Press the Fork button top right the page to save copy of this project on your account. Download the repository files project from the download section or clone this project by typing in the bash the following command:. If you want to contribute to this project and make it better with new ideas, your pull request is very welcomed.

If you find any issue just put it in the repository issue section, thank you. Skip to content. MIT License. Go back. Launching Xcode If nothing happens, download Xcode and try again. Latest commit. Git stats 29 commits. Failed to load latest commit information.

View code. Calculator App Very basic calculator application created by Java Swing. Thank You! About Calculator app created with Java Swing, It is simple with an easy code to help novices learn how to operate a calculator. Topics java calculator swing java-swing java-project swing-gui calculator-application calculator-app.

Releases No releases published. Packages 0 No packages published. You signed in with another tab or window. Reload to refresh your session. You signed out in another tab or window.Code Review Stack Exchange is a question and answer site for peer programmer code reviews.

It only takes a minute to sign up. I am not completely new to programming but I may be making some common mistakes, or not writing the most efficient code. I wanted to make a calculator that can take multiple numbers and operations before finding the answer using MDAS, instead of just returning the answer after every operation and using it for the next.

My code consists of a single class. There isn't much code so I didn't know if there was a good reason to split it into multiple classes, however I have never written something like this so please feel free to correct me.

Repo with example gif and runnable jar. Package names should associate the software with the author, like com. You only need this field if it is highly likely that the class will be serialized Also, final arrays are not as final as you'd think, the individual values can still be changed. You most likely want an Enum Your frame is perfectly resizable as far as I can see.

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By setting it not-resizable you only make sure that your application becomes unusable under different LaFs and font-sizes. I'm a very persistent advocate for that you're only allowed to use single-letter variable names if your dealing with dimensions. Don't shorten variable names just because you can, the decreased amount of typing is not worth the decreased readability. Regarding the creation of buttons, I like to create helper methods and classes which make the code easier to read, in this case I'd go for lambdas, like this:.

Another alternative would be to create a private class NumberAction which accepts a number in its constructor and performs the associated action. That would also allow you to get rid of the final-redeclaration. It would be better to split the responsibilities here. The frame itself is only responsible with getting its own layout going, while the main method should be responsible for getting the frame displayed. Your logic does not seem to contain any sort of error handling, I believe pressing an operator button twice in succession should yield an error.

Maybe a better approach would be to print the whole expression to the screen as entered, and then apply the Shunting Yard Algorithm to process that expression.

Your logic doesn't do decimals, neither does it gracefully handle overflows. By changing your logic yo use BigDecimal s you could handle both easily. Note that you must create BigDecimal s with an appropriate MathContext to have proper accuracy and behavior.

Java Calculator Program Using AWT & Applet | Free Download

If you want read an already existing implementation, I can recommend exp4j for a math-expression library using floats, EvalEx for one using BigDecimaland my own project jMathPaper for a calculator which sport different GUIs regarding abstraction.

When you want an array with pre-defined values that can be constant, you can declare the array anonymously. This will give you more advantage than the array, since you will be able to remove the duplication. When dividing by zero, there an java. ArithmeticException throw by java; I suggest that you add a check :. By using the List you have to use an index, the Queue to remove the first item java.In this program, you'll learn to make a simple calculator using switch.

This calculator would be able to add, subtract, multiply and divide two numbers. To understand this example, you should have the knowledge of the following Java programming topics:.

Likewise, the two operands, 1. This statement calculates the product and stores in the variable result and the break ; the statement ends the switch statement. Note : We have used the printf method instead of println. This is because here we are printing the formatted string. Course Index Explore Programiz. Java for Loop. Arrays in Java.

Interfaces in Java. Java ArrayList. Popular Examples Check prime number. Print the Fibonacci series. Print Pyramids and Patterns.

swing java calculator

Multiply two matrices. Find the standard deviation. Reference Materials String.

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Start Learning Java. Explore Java Examples. Java Examples Check Leap Year. Check Whether a Number is Positive or Negative. Check Whether a Character is Alphabet or Not. Calculate the Sum of Natural Numbers. Find Factorial of a Number. Generate Multiplication Table.Consider the following scenario.

We need to create a GUI based application which calculates grade of students according to marks obtained in 4 subjects. Below are the range of marks for different grades. Eg: GeeksForGeeks and click Finish. Now from the palette situated at the right-hand side of the window, start dragging the toolkit widgets as per requirements. To change the background color of the frame, we need to first insert a JPanel and change its properties.

Double click on the background option and select any color of your choice. Then click OK. After setting background color, drag other widgets onto the design area. First it overlaps the existing design. It will go behind. Now to type the code, double click on jButton1you will be directed to the source tab. Here type in the following code. Now to clear all textfields write the following code under the jButton2 ActionPerformed option which can be achieved by clicking twice on Clear Button in the design area.

Now to exit from the system, use the following statement under the jButton3 ActionPerformed option which can be achieved by clicking twice on exit button in the design area. Now, right-click anywhere on the screen and select Run File option from the drop-down menu. The final output is shown below.

Input necessary details and the application is ready! Attention reader!

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Get hold of all the important Java Foundation and Collections concepts with the Fundamentals of Java and Java Collections Course at a student-friendly price and become industry ready. Writing code in comment? Please use ide. Skip to content. Related Articles. Last Updated : 01 Sep, Steps to create the Student Grade Calculator 1. Drag the panel to fit the frame size. Final Output. Recommended Articles.

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