{"id":11018,"date":"2023-04-11T18:00:43","date_gmt":"2023-04-11T12:30:43","guid":{"rendered":"http:\/\/myprojectideas.com\/?p=11018"},"modified":"2025-10-10T11:52:30","modified_gmt":"2025-10-10T11:52:30","slug":"simple-calculator-using-java","status":"publish","type":"post","link":"https:\/\/rudelabs.ai\/blogs\/simple-calculator-using-java\/","title":{"rendered":"Simple Calculator Using Java"},"content":{"rendered":"<h2><a id=\"post-11018-_8pw0ee1qailn\"><\/a><strong>Introduction of the Project<\/strong><\/h2>\n<p>If you&#8217;re looking to dive into the basics of Java and want to create a practical application, then building a simple calculator is a fantastic starting point. Calculators are fundamental tools used in many applications, and building one in Java can be a great way to improve your programming skills. As a Java expert, let me guide you through the process of developing a simple calculator using Java.<\/p>\n<p>In this guide, we&#8217;ll walk you through the step-by-step process of developing a simple calculator using Java. You&#8217;ll learn how to set up your Java development environment, create a Java class, get user input, perform calculations, display results, add error handling, and test your program. Whether you&#8217;re a beginner or an experienced Java developer, this guide will provide you with the knowledge and tools to build a functional calculator that you can be proud of.<\/p>\n<p>So, let&#8217;s dive in and unlock the world of Java programming as we start on this exciting journey to develop a simple calculator that showcases the power and versatility of Java!<\/p>\n<iframe loading=\"lazy\"  id=\"_ytid_70468\"  width=\"1080\" height=\"607\"  data-origwidth=\"1080\" data-origheight=\"607\" src=\"https:\/\/www.youtube.com\/embed\/ALz2nisCLEQ?enablejsapi=1&autoplay=0&cc_load_policy=0&cc_lang_pref=&iv_load_policy=1&loop=0&rel=1&fs=1&playsinline=0&autohide=2&theme=dark&color=red&controls=1&\" class=\"__youtube_prefs__  no-lazyload\" title=\"YouTube player\"  allow=\"fullscreen; accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen data-no-lazy=\"1\" data-skipgform_ajax_framebjll=\"\"><\/iframe>\n<p>&nbsp;<\/p>\n<h2><a id=\"post-11018-_gbj88ejh8ni3\"><\/a><strong>Objectives<\/strong><\/h2>\n<p>1. To implement the right mathematics to solve simple problems of addition, subtraction, multiplication, and division.<\/p>\n<p>2. To create a graphic user interface (GUI) involving some graphics, along with the fundamental calculator logic, to give users a good interface to work with.<\/p>\n<h2><a id=\"post-11018-_45cvyl37z6b4\"><\/a><strong>Requirements<\/strong><\/h2>\n<div class=\"group w-full text-gray-800 dark:text-gray-100 border-b border-black\/10 dark:border-gray-900\/50 bg-gray-50 dark:bg-[#444654]\">\n<div class=\"text-base gap-4 md:gap-6 md:max-w-2xl lg:max-w-xl xl:max-w-3xl p-4 md:py-6 flex lg:px-0 m-auto\">\n<div class=\"relative flex w-[calc(100%-50px)] flex-col gap-1 md:gap-3 lg:w-[calc(100%-115px)]\">\n<div class=\"flex flex-grow flex-col gap-3\">\n<div class=\"min-h-[20px] flex flex-col items-start gap-4 whitespace-pre-wrap\">\n<div class=\"markdown prose w-full break-words dark:prose-invert dark\"><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"group w-full text-gray-800 dark:text-gray-100 border-b border-black\/10 dark:border-gray-900\/50 dark:bg-gray-800\">\n<div class=\"text-base gap-4 md:gap-6 md:max-w-2xl lg:max-w-xl xl:max-w-3xl p-4 md:py-6 flex lg:px-0 m-auto\">\n<div class=\"relative flex w-[calc(100%-50px)] flex-col gap-1 md:gap-3 lg:w-[calc(100%-115px)]\">\n<div class=\"flex flex-grow flex-col gap-3\"><\/div>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"group w-full text-gray-800 dark:text-gray-100 border-b border-black\/10 dark:border-gray-900\/50 bg-gray-50 dark:bg-[#444654]\">\n<div class=\"text-base gap-4 md:gap-6 md:max-w-2xl lg:max-w-xl xl:max-w-3xl p-4 md:py-6 flex lg:px-0 m-auto\">\n<div class=\"w-[30px] flex flex-col relative items-end\">\n<div class=\"text-xs flex items-center justify-center gap-1 invisible absolute left-0 top-2 -ml-4 -translate-x-full group-hover:visible !invisible\">Before diving into the process of developing a simple calculator using Java, there are a few prerequisites that you need to have in place. These include:<\/div>\n<\/div>\n<div class=\"relative flex w-[calc(100%-50px)] flex-col gap-1 md:gap-3 lg:w-[calc(100%-115px)]\">\n<div class=\"flex flex-grow flex-col gap-3\">\n<div class=\"min-h-[20px] flex flex-col items-start gap-4 whitespace-pre-wrap\">\n<div class=\"markdown prose w-full break-words dark:prose-invert dark\">\n<p><em><strong>1. Java Development Kit (JDK):<\/strong> <\/em>You&#8217;ll need to have the JDK installed on your computer. The JDK includes the Java compiler and runtime environment necessary for developing and running Java programs. You can <a href=\"https:\/\/www.oracle.com\/java\/technologies\/downloads\/\">download the JDK<\/a> from the official Java website and follow the installation instructions.<\/p>\n<p><em><strong>2. Integrated Development Environment (IDE):<\/strong><\/em> You&#8217;ll need an IDE to write, compile, and run your Java code. There are several popular IDEs for Java, such as Eclipse, <a href=\"https:\/\/www.jetbrains.com\/idea\/\">IntelliJ IDEA<\/a>, and NetBeans. Choose an IDE that you are comfortable with, or try out a few to see which one suits your preferences.<\/p>\n<p><em><strong>3. Basic understanding of Java syntax:<\/strong><\/em> It&#8217;s essential to have a basic understanding of Java syntax, including data types, variables, operators, control flow statements (such as if-else and loops), and basic object-oriented programming concepts (such as classes and methods).<\/p>\n<p><em><strong>4. Understanding of arithmetic operations:<\/strong><\/em> You should have a solid understanding of basic arithmetic operations such as addition, subtraction, multiplication, and division, as you&#8217;ll be using these operations to perform calculations in your calculator.<\/p>\n<p><em><strong>5. Swing module to implement the Graphic User Interface:<\/strong><\/em> The best part about using Swing to create components like tables, scroll panes, buttons, and the like is that the framework is platform-independent.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<h2><a id=\"post-11018-_gi3pmwwwzcor\"><\/a><strong>Source Code<\/strong><\/h2>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"java\">\/\/ Java program to create a simple calculator\r\n\r\n\/\/ with basic +, -, \/, * using java swing elements\r\n\r\n\r\n\r\n\r\nimport java.awt.event.*;\r\n\r\nimport javax.swing.*;\r\n\r\nimport java.awt.*;\r\n\r\nclass calculator extends JFrame implements ActionListener {\r\n\r\n\/\/ Creating a frame\r\n\r\nstatic JFrame f;\r\n\r\n\r\n\r\n\r\n\/\/ Creating a textfield\r\n\r\nstatic JTextField l;\r\n\r\n\r\n\r\n\r\n\/\/ storing operator and operands\r\n\r\nString s0, s1, s2;\r\n\r\n\r\n\r\n\r\n\/\/ The default constructor\r\n\r\ncalculator()\r\n\r\n{\r\n\r\ns0 = s1 = s2 = \"\";\r\n\r\n}\r\n\r\n\r\n\r\n\r\n\/\/ Main function\r\n\r\npublic static void main(String args[])\r\n\r\n{\r\n\r\n\/\/ create a frame\r\n\r\nf = new JFrame(\"calculator\");\r\n\r\n\r\n\r\n\r\ntry {\r\n\r\n\/\/ Setting the look &amp; feel\r\n\r\nUIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());\r\n\r\n}\r\n\r\ncatch (Exception e) {\r\n\r\nSystem.err.println(e.getMessage());\r\n\r\n}\r\n\r\n\r\n\r\n\r\n\/\/ creating an object of class\r\n\r\ncalculator c = new calculator();\r\n\r\n\r\n\r\n\r\n\/\/ creating a textfield\r\n\r\nl = new JTextField(16);\r\n\r\n\r\n\r\n\r\n\/\/ setting the textfield to non-editable\r\n\r\nl.setEditable(false);\r\n\r\n\r\n\r\n\r\n\/\/ creating buttons for the numbers and operators\r\n\r\nJButton b0, b1, b2, b3, b4, b5, b6, b7, b8, b9, ba, bs, bd, bm, be, beq, beq1;\r\n\r\n\r\n\r\n\r\n\/\/ number buttons\r\n\r\nb0 = new JButton(\"0\");\r\n\r\nb1 = new JButton(\"1\");\r\n\r\nb2 = new JButton(\"2\");\r\n\r\nb3 = new JButton(\"3\");\r\n\r\nb4 = new JButton(\"4\");\r\n\r\nb5 = new JButton(\"5\");\r\n\r\nb6 = new JButton(\"6\");\r\n\r\nb7 = new JButton(\"7\");\r\n\r\nb8 = new JButton(\"8\");\r\n\r\nb9 = new JButton(\"9\");\r\n\r\n\r\n\r\n\r\n\/\/ creating the equals to button\r\n\r\nbeq1 = new JButton(\"=\");\r\n\r\n\r\n\r\n\r\n\/\/ creating buttons for the operator\r\n\r\nba = new JButton(\"+\");\r\n\r\nbs = new JButton(\"-\");\r\n\r\nbd = new JButton(\"\/\");\r\n\r\nbm = new JButton(\"*\");\r\n\r\nbeq = new JButton(\"C\");\r\n\r\n\r\n\r\n\r\n\/\/ creating decimal \".\" button\r\n\r\nbe = new JButton(\".\");\r\n\r\n\r\n\r\n\r\n\/\/ creating one panel\r\n\r\nJPanel p = new JPanel();\r\n\r\n\r\n\r\n\r\n\/\/ adding the action listeners\r\n\r\nbm.addActionListener(c);\r\n\r\nbd.addActionListener(c);\r\n\r\nbs.addActionListener(c);\r\n\r\nba.addActionListener(c);\r\n\r\nb9.addActionListener(c);\r\n\r\nb8.addActionListener(c);\r\n\r\nb7.addActionListener(c);\r\n\r\nb6.addActionListener(c);\r\n\r\nb5.addActionListener(c);\r\n\r\nb4.addActionListener(c);\r\n\r\nb3.addActionListener(c);\r\n\r\nb2.addActionListener(c);\r\n\r\nb1.addActionListener(c);\r\n\r\nb0.addActionListener(c);\r\n\r\nbe.addActionListener(c);\r\n\r\nbeq.addActionListener(c);\r\n\r\nbeq1.addActionListener(c);\r\n\r\n\r\n\r\n\r\n\/\/ adding different elements to the panel\r\n\r\np.add(l);\r\n\r\np.add(ba);\r\n\r\np.add(b1);\r\n\r\np.add(b2);\r\n\r\np.add(b3);\r\n\r\np.add(bs);\r\n\r\np.add(b4);\r\n\r\np.add(b5);\r\n\r\np.add(b6);\r\n\r\np.add(bm);\r\n\r\np.add(b7);\r\n\r\np.add(b8);\r\n\r\np.add(b9);\r\n\r\np.add(bd);\r\n\r\np.add(be);\r\n\r\np.add(b0);\r\n\r\np.add(beq);\r\n\r\np.add(beq1);\r\n\r\n\r\n\r\n\r\n\/\/ setting the Background of the panel\r\n\r\np.setBackground(Color.blue);\r\n\r\n\r\n\r\n\r\n\/\/ adding the panel to the frame\r\n\r\nf.add(p);\r\n\r\n\r\n\r\n\r\nf.setSize(200, 220);\r\n\r\nf.show();\r\n\r\n}\r\n\r\npublic void actionPerformed(ActionEvent e)\r\n\r\n{\r\n\r\nString s = e.getActionCommand();\r\n\r\n\r\n\r\n\r\n\/\/ if the value entered is a number\r\n\r\nif ((s.charAt(0) &gt;= '0' &amp;&amp; s.charAt(0) &lt;= '9') || s.charAt(0) == '.') {\r\n\r\n\/\/ if operand is present then add to second number\r\n\r\nif (!s1.equals(\"\"))\r\n\r\ns2 = s2 + s;\r\n\r\nelse\r\n\r\ns0 = s0 + s;\r\n\r\n\r\n\r\n\r\n\/\/ setting the value of the text\r\n\r\nl.setText(s0 + s1 + s2);\r\n\r\n}\r\n\r\nelse if (s.charAt(0) == 'C') {\r\n\r\n\/\/ clearing the one letter\r\n\r\ns0 = s1 = s2 = \"\";\r\n\r\n\r\n\r\n\r\n\/\/ set the value of text\r\n\r\nl.setText(s0 + s1 + s2);\r\n\r\n}\r\n\r\nelse if (s.charAt(0) == '=') {\r\n\r\n\r\n\r\n\r\ndouble te;\r\n\r\n\r\n\r\n\r\n\/\/ store the value in 1st\r\n\r\nif (s1.equals(\"+\"))\r\n\r\nte = (Double.parseDouble(s0) + Double.parseDouble(s2));\r\n\r\nelse if (s1.equals(\"-\"))\r\n\r\nte = (Double.parseDouble(s0) - Double.parseDouble(s2));\r\n\r\nelse if (s1.equals(\"\/\"))\r\n\r\nte = (Double.parseDouble(s0) \/ Double.parseDouble(s2));\r\n\r\nelse\r\n\r\nte = (Double.parseDouble(s0) * Double.parseDouble(s2));\r\n\r\n\r\n\r\n\r\n\/\/ set the value of text\r\n\r\nl.setText(s0 + s1 + s2 + \"=\" + te);\r\n\r\n\r\n\r\n\r\n\/\/ converting it to string\r\n\r\ns0 = Double.toString(te);\r\n\r\n\r\n\r\n\r\ns1 = s2 = \"\";\r\n\r\n}\r\n\r\nelse {\r\n\r\n\/\/ if there was no operand\r\n\r\nif (s1.equals(\"\") || s2.equals(\"\"))\r\n\r\ns1 = s;\r\n\r\n\/\/ else evaluate\r\n\r\nelse {\r\n\r\ndouble te;\r\n\r\n\r\n\r\n\r\n\/\/ store the value in 1st\r\n\r\nif (s1.equals(\"+\"))\r\n\r\nte = (Double.parseDouble(s0) + Double.parseDouble(s2));\r\n\r\nelse if (s1.equals(\"-\"))\r\n\r\nte = (Double.parseDouble(s0) - Double.parseDouble(s2));\r\n\r\nelse if (s1.equals(\"\/\"))\r\n\r\nte = (Double.parseDouble(s0) \/ Double.parseDouble(s2));\r\n\r\nelse\r\n\r\nte = (Double.parseDouble(s0) * Double.parseDouble(s2));\r\n\r\n\r\n\r\n\r\n\/\/ convert it to string\r\n\r\ns0 = Double.toString(te);\r\n\r\n\r\n\r\n\r\n\/\/ place the operator\r\n\r\ns1 = s;\r\n\r\n\r\n\r\n\r\n\/\/ make the operand blank\r\n\r\ns2 = \"\";\r\n\r\n}\r\n\r\n\r\n\r\n\r\n\/\/ set the value of text\r\n\r\nl.setText(s0 + s1 + s2);\r\n\r\n}\r\n\r\n}\r\n\r\n}<\/pre>\n<h2><a id=\"post-11018-_nujvvd8deq3e\"><\/a><strong>Explanation of the Code<\/strong><\/h2>\n<p>Since we will be using Swing to create the GUI of the application, you can imagine that will be the major chunk of the program as the mathematics is pretty simple since we will restrict this basic calculator to +, -, *, and \/ operations.<\/p>\n<p>1. For the GUI, we will start by creating buttons for all the digits from 0-9. We will also create buttons for the operands such as +, -, *, and \/.<\/p>\n<p>2. The application will have a button to clear the values from the \u201cdisplay\u201d of the calculator application.<\/p>\n<p>3. We will also use a text field that will be set to uneditable. This text field will become the display of the calculator.<\/p>\n<p>4. Once all the buttons have been created and laid out in the JFrame, the buttons will be functionalized using the <a href=\"https:\/\/www.javatpoint.com\/java-actionlistener\">addActionListener<\/a> (ActionListener d) function.<\/p>\n<p>5. Whenever a button containing any digit is pressed, we will go to an <em><strong>&#8220;IF statement&#8221;<\/strong><\/em> that will store it in a variable. If an operator button is pressed, it will be stored as a string again.<\/p>\n<p>6. If the \u201c=\u201d button is pressed, the program will check for what kind of operation and perform the operation. The output will be converted back to string and displayed as output.<\/p>\n<h2><a id=\"post-11018-_hoj4xtwliz1h\"><\/a><strong>Output<\/strong><\/h2>\n<h3><strong>Addition<\/strong><\/h3>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-17578 size-full\" src=\"https:\/\/rudelabs.ai\/blogs\/wp-content\/uploads\/2023\/04\/word-image-11018-1.webp\" alt=\"Simple Calculator Using Java\" width=\"213\" height=\"318\" \/><\/p>\n<h3><strong>Multiplication<\/strong><\/h3>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-17580\" src=\"https:\/\/rudelabs.ai\/blogs\/wp-content\/uploads\/2023\/04\/word-image-11018-2-206x300.webp\" alt=\"Simple Calculator Using Java\" width=\"206\" height=\"300\" \/><\/p>\n<p>We have successfully developed a simple calculator using Java and Swing frameworks. While this is a basic version with few operations, the same logic can also be extended to create a scientific calculator.<\/p>\n<p><a href=\"https:\/\/rudelabs.ai\/blogs\/category\/java\/\"><em><strong>More Java Projects&gt;&gt;&gt;<\/strong><\/em><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>In this Java project tutorial, we&#8217;ll walk you through the step-by-step process of developing a simple calculator using Java.<\/p>\n","protected":false},"author":1,"featured_media":11019,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[4,7,8],"tags":[],"class_list":["post-11018","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-coding-basics","category-coding-projects","category-java"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.1.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Simple Calculator Using Java - RUDE LABS<\/title>\n<meta name=\"description\" content=\"Calculators are fundamental tools used in many applications, and building one in Java can be a great way to improve your programming skills. 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