Java calculator app 🖩

[@BroCodez]

import javax.swing.*; import java.awt.*; import java.awt.event.*; public class Calculator implements ActionListener{ JFrame frame; JTextField textfield; JButton[] numberButtons = new JButton[10]; JButton[] functionButtons = new JButton[9]; JButton addButton,subButton,mulButton,divButton; JButton decButton, equButton, delButton, clrButton, negButton; JPanel panel; Font myFont = new Font("Ink Free",Font.BOLD,30); double num1=0,num2=0,result=0; char operator; Calculator(){ frame = new JFrame("Calculator"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setSize(420, 550); frame.setLayout(null); textfield = new JTextField(); textfield.setBounds(50, 25, 300, 50); textfield.setFont(myFont); textfield.setEditable(false); addButton = new JButton("+"); subButton = new JButton("-"); mulButton = new JButton("*"); divButton = new JButton("/"); decButton = new JButton("."); equButton = new JButton("="); delButton = new JButton("Del"); clrButton = new JButton("Clr"); negButton = new JButton("(-)"); functionButtons[0] = addButton; functionButtons[1] = subButton; functionButtons[2] = mulButton; functionButtons[3] = divButton; functionButtons[4] = decButton; functionButtons[5] = equButton; functionButtons[6] = delButton; functionButtons[7] = clrButton; functionButtons[8] = negButton; for(int i =0;i

[@vickysanth9653]

it would be more easy to understad for beginners like me if you go slower than usual.. because i don't understand many terms like "ActionListener", interfaces etc.. it's like new to me since I'm a beginner..

[@sidra3210]

Nice👍🔥

[@shokirovollohberdi]

@@komaltandle465 LOL

[@agent47hitman75]

@NOA777 the method Double.parseDouble() casts a value to a double type value. the getText() method is used to get the text from the text field. So Double.parseDouble(txtfield.getText()) is actually casting the string values to a double type value of whatever is written in the rext field as we can't perform calculation with string type of values.

[@medjl6083]

@NOA777 The method parseDouble() of wrapper class Double, convert string to double.

[@deepeshsingh7717]

People are missing out on your amazing content. I am still learning Java, and your content helps a lot.

[@Bryysanity]

how are you now on your Java journey?

[@kylewc2286]

​@@Bryysanity Im curious too

[@ashkaneghbali2702]

Came here straight after the 12 hour java tutorial. You are Awesome Bro. Keep 'em coming :)

[@milesmiller9588]

Started practice with GUI's and this helped a lot!

[@AnsarAbbas-ed5ig]

off course same here bro😎

[@AhsanSharief]

00:03 How to make a simple calculator program using Java 03:50 Creating a Java calculator app with J buttons and J panel 07:05 Adding text field and buttons to the calculator app 10:42 Creating an array of JButtons 14:32 Adding delete and clear buttons to the calculator app interface. 17:54 Adding buttons to the panel 21:34 Adding functionality to decimal button and various math operations 26:25 Implementing Clear and Delete functionality in Java calculator app 30:17 Added functionality to the negative button, allowing the user to flip the sign of the number displayed in the text field. 33:44 How to make a very simple calculator using Java

[@StefaanMeeuws]

Most impressive. Very lucid coding. Congrats on teaching me a little more than I knew!

[@Sorjen108]

This channel is so underrated I went through many tuto on youtube, but none of them was that good(sincerely), and this is in regards to any programming language This developer is Gold

[@flyetimadtravel2157]

Bro You are legend. I am not a student I started learning JAVA to make my travel agency CRM.

[@EbbieMonch]

This tutorial was very good and even gave the challenge of fixing the Delete and Clear font size while keeping the rest of the numbers and functions font the same size

[@slonbeskonechen8310]

Please, don't stop!!! More and more tutorials!!!!

[@Zito_from_OHIO]

the first sentence (Please, don't stop!!) remember me of a chat i had i chai 😏😏

[@Ali42480]

@@Zito_from_OHIO

[@alessandroformica6824]

Thank you, Bro! My prayers to the algorithm.

[@kumarkelash4423]

you are really a great teacher you have made my life easy hahahah... God bless you sir

[@zul_afluz]

Extremely helpful. Got my mini project done within 30 minutes referring your source code and guide. Thankkksss a lotttt ☺👏

[@rasisulhubbi9316]

I just start learning java a month ago and a little bit confuse what to do, and i found your channel, its really help me to practice

[@westonpeabody8010]

Thanks man. Believe it or not Ive been learning Java for years and until now Ive never actually wrote a fully functional calculator.

[@manthanpatki146]

well I am just commenting to support you because this video has been really helpful and i learnt more ways to use GUI in java.

[@BlueOrcas]

I knew bro couldn't miss the negative sign before. He just cares for us bros and was testing us to grow stronger💪

[@noah77]

Cool, this is nice. Awesome video. And also, I have finished creating my AI ChatBot!!

[@BroCodez]

nice! Which app is it for?

[@fmsabisai]

This is an amazing tutorial, thumbs up. I would have loved to see how you handled division by 0. I have also noticed that its possible to have multiple dots in a number which would result in an error during calculations.

[@yasarcarel]

if(e.getSource() == decButton) { if(textfield.getText().contains(".")) { String temp = textfield.getText(); textfield.setText(""); for(int i=0;i

[@incarnateblizzard4874]

little bit late, but came across the tutorial right now. for multiple dots I did (most likely theres a better solution): if(e.getSource() == decButton) { boolean alrDec = false; for(int i = 0; i

[@secretchannel2151]

You are a true Bro. Thank you very much sir! Everyone keep commenting, liking and subbing to help the algorithm!

[@mansinaidu]

bro this was really awesome .... my sir told it but it was too confusing but your program was clean and neat.... thank you so much .

[@karllouiserito]

Thanks Bro I've learned something new today about Java especially that GUI.

[@கீர்த்திக்வாசன்-ர1ஞ]

awesome broo..keep rocking

[@kemann3815]

Amazing video. That robotic laugh at the end got me 😂

[@gyangaha109]

yo bro, love it thanks keep up the good work

[@Respects103]

best yt for coding i learned many things from you thanks you so much bro code

[@parkashkumar765]

You always perfect sir because your way of teaching is all the time perfect. Thank you so much sir.🥰

[@biplobahmed6509]

no caption king. learned a lot from you . thnaks for the quality content

[@mohammedhh6488]

Thank you very much for your assistance, you explained the code perfectly. Thumb Up.

[@YaroMalik]

Bro the goat. Just finished learning Java with you and am building my first project with you too

[@BigBadBicycle]

I just begun with Java and made my own calculator like this. But after finishing and seeing this video, there is a lot of things I could do to definetly reduce my code size.

[@muhammadbsoul1459]

Thanks pro Very helpful video Keep going

[@suaddacic7728]

Thanks man You explain java better than my teacher

[@ChinmayaHelchel]

Thank you @BroCode ☺ It was really up to the point !

[@ManuelErica]

You're the man. Good job!

[@thebeginner613]

Polich machaa.. You are great 👏🏻👏🏻

[@Hypa_Playz]

Nice content keep it up!!!🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥

[@365motivation.9]

Bro code,this is an amazing tutorial.Thank you Mann,you taught me alot here.

[@grenadine9448]

Awesome content !

[@bellabrink8610]

Amazing content as always man, thank you!

[@gabrielvalentin3106]

Excellent as always bro!

[@alireza_programmer]

Thanks a million , It was really nice and perfect for a beginner like me

[@halimaomar9820]

I had a few problems with this application and I fixed one. It looks like when you use the negative button you can't click it first then click the number button you want to be negative. It will cause the program to crash. To fix this problem you can use a try and catch method plus a NumberFormatException. The NumberFormatException is an unchecked exception in Java that occurs when an attempt is made to convert a string with an incorrect format to a numeric value. Therefore, this exception is thrown when it is not possible to convert a string to a numeric type (e.g. int, float). It has this problem with negative values. However, the negative button works when you click the number button first then click the negative button. I still put this exception in just in case someone clicks the negative button first. It isn't a great fix because I would like the negative button to work both ways so it won't matter which you click first the number or the negative button. When I figure this out then I will update folks. First, I will attempt to replicate what my phone calculator does with negative buttons. They have a +/- option that has a few different behaviors that I can implement. The second problem I identified is that the functionality of the negative button doesn't work. I checked Bro Code's source code and copied then pasted it on my Eclipse file but still has the same problem. I knew it would but I wanted to make sure it wasn't just me. When you trying adding or multiplying or dividing a number against a negative number it will convert the negative number to -1. No matter what value your negative number is. For example it's -8, it will convert it to -1. Example 1, 3 * -8 = -24, but the calculator will process the equation like this: 3 * -1 = -3. I think maybe I can add a case to the switch statement so I'm going to try that first. Or I can add a loop to the negative button to address the -1 problem. As I said before, when I have solutions for this then I will post it to my comment thread.

[@halimaomar9820]

Update: I found a solution to the problem I identified with negative numbers. This solution I tested and it works. Negative value numbers won't automatic be converted to -1 but will have the value you intended. Code: if (e.getSource() == negButton) { double num = Double.parseDouble(textfield.getText()); if (num >= 0) { double resultneg = num * -1; textfield.setText(resultneg + " "); } else { double resultpos = num * -1; textfield.setText(resultpos + " "); } If you notice I changed the button to no longer just be a negative button but a +/- button. I did this because of the calculator apps today on phones and computers are setup with +/- functions.

[@halimaomar9820]

Full solution code fixing all the bugs/errors: try { if (e.getSource() == negButton) { double num = Double.parseDouble(textfield.getText()); if (num >= 0) { double resultneg = num * -1; textfield.setText(resultneg + ""); } else { double resultpos = num * -1; textfield.setText(resultpos + ""); } } } catch (NumberFormatException num) { System.out.println( "NumberFormatException occurred"); }

[@Rakavi-h4f]

​@@halimaomar9820 if else condition to check num > 0 or less than or equal to zero , pretty much does the same function as the original bro code.Though it checks explicitly,the results are the same Btw, the two possible errors that you have spotted out are correct but unfortunately there is no solution for those in your code

[@orlandohunter2785]

Bro! These videos are awesome 👏

[@mohdaman5928]

i truly learn a lot man thanks

[@athulretnakar1907]

Thankyou for your valuable content 😍

[@kampfer6375]

Very well explained 👍

[@LiyaAi-fm9ec]

Very beautiful, Love it!

[@ritikrajput2894]

Wonderful Tutorial

[@JEE-nf1cv]

This was indeed Helpful brother Thanks for the tutorial

[@animegaming7116]

the package come back as error what to do

[@shibildas]

Bro, that was awesome ❤️

[@B_lla008]

thanks for clean work it really help me !you are super good :)

[@quikmath8071]

Awesome tutorial

[@anilsilwal1773]

Great teaching

[@wolanus]

Another great video. Thanks!

[@alvydagr8108]

Wow even though your style is different, its super easy to understand and frankly, might make me do my calculator over just because It seems easier the way you did it

[@HenocDossou]

Very cool! Helped me alot!

[@khusanbekgafurov]

Awesome job I like it Thanks

[@athenkosinyombolo4275]

This was really helpful

[@helpdesk9535]

Thanks for the help Big Bro!

[@etude5942]

Thank you so much for the perfect explanation ❤❤❤❤😭

[@sci-figameguy8241]

Hey I was wondering if you could help me, I'm making this using IntelliJ right now and at 6:40 when I run it to check if a frame comes up I get the error: "Error: Could not find or load main class Main" and I see you don't have a main class either but for some reason yours works?

[@mahaalibrahim7934]

That’s was a lot of code thanks for your effort

[@Ahmad-jc7by]

so enjoyable, thanks for this Man

[@omeraran9398]

I love your channel.

[@sudhikrishnana9778]

Great program👍👍👍

[@Dontwatchthischannel]

Incase you guys didnt know, calc is short for calculator, im just speaking in slang...

[@meguminsatou1591]

man Thank you i really need this tutorial for my computer programming 2

[@manasapanda9248]

Amazing video I really enjoy this as this is very useful in my program

[@maikemvictorine9100]

Simple and underatandable

[@ahmedshifa]

Amazing content, thank you!

[@djziomsuper]

Great video!

[@Sub-w3x]

Very Hard working of ur life shows

[@cutie3127]

Your amazing Content makes me to passionate about java more... I thought to left but ...

[@garvitarora4960]

Also my comments on you is "Thanks you very much, Bro!"

[@soumelee5661]

thanks bro for this video!! very helpful :)

[@Gaminiheraliyawala]

Dear Bro you are simply amazing... ❤❤💐💐being sooo... generous in sharing your wealth of knowledge and you certainly deserve a very big appreciation for making me impressed to learn Java programming. God Bless You Bro...🙏🙏. I really loved it and impatient to try it ASAP..... 👌👌👍👍

[@Sapocrate]

Thanks! (I appreciate also the 420 on the preview)

[@divyakale1271]

Thanks Wonderful video ! This video is easy to understand and very helpful.

[@omersond4891]

very helpful video. i understand for loops, if() more than before

[@ThunderHockeyTFL]

big thanks, very helpful video! subbed

[@kkirs9561]

great video tbf

[@alien3200]

20:35 He was scared for life 😂😂

[@letsgame108]

Thank you so much bro. this is really amazing

[@ОлегДомащенко-ы7б]

great example. Thanks

[@ashnasanam217]

Underrated!

[@ThePraQNome]

Great tutorial, thank you.

[@abdialemu8391]

you are a hero!

[@chiyuzhang3089]

Thanks Bro, great video!

[@ryandavis710]

Great tutorial

[@ShahzadKhan-jg3hl]

Well defined. Thank you.

[@Dejuk22]

well done bro🙌 thank you!!

[@vasilizaitsev7246]

Great work bro

[@raziqraz5043]

Thank you bro Awesome video

[@lener6345]

Congratulations you have cracked the youtube algorithm

[@Baltazar_Gunar]

i just finish second book about java. A Beginners Guide and Complete Reference from Herbert SCHİLDT. I was looking for an example of real GUI software that wasn't beyond my knowledge and actually did something. So I could get an idea of ​​the general programming structure. Your video help me a lot about this. Thank you.

[@infotechlab]

hey bro! thanks a lot for this amazing content..

[@rudranagariya8546]

Thank you so much bro you are the only best coder

[@stanislavdimitrov1643]

Great, fantastic. It may seem a little but too advanced at the beginning, but you can try it and see:)

[@konsti02]

this is great! Thank you