Cara membuat kalkulator dengan bahasa pemrograman java

Kami akan berikan 2 bagian source code atau free source code membuat calculator sederhana secara lengkap melalui Github.

Berikut source code untuk versi CLI

/*

 * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license

 * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Main.java to edit this template

 */

package calculator;

/**

 *

 * @author Ahroi

 */

import java.util.Scanner;

public class Calculator {

    public static void main(String args[])

    {

        Scanner input = new Scanner(System.in);

        int num1, num2, optS ,res = 0;

        System.out.println("PROGRAM JAVA CALCULATOR WITH CLI");

        System.out.println("1. Penjumlahan - Add (+)");

        System.out.println("2. Pengurangan - Sub (-)");

        System.out.println("3. Perkalian - Mul (*)");

        System.out.println("4. Pembagian - Div (/)");

        System.out.println("----------------------------");

        System.out.print("Operator (enter): ");

        optS=input.nextInt();

        System.out.print("Num 1 (enter): ");

        num1=input.nextInt();

        System.out.print("Num 2 (enter): ");

        num2=input.nextInt();

                 

        switch (optS){

             case 1 -> res=num1+num2;

             case 2 -> res=num1-num2;

             case 3 -> res=num1*num2;

             case 4 -> res=num1/num2;

             default -> System.out.println("Option Error!");

        }         

        System.out.println("Result :"+res);

    }

    

}

Untuk versi GUI

/*

 * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license

 * Click nbfs://nbhost/SystemFileSystem/Templates/GUIForms/JFrame.java to edit this template

 */

package calculator.gui;

/**

 *

 * @author Ahroi

 */

public class NewJFrameCal extends javax.swing.JFrame {

    /**

     * Creates new form NewJFrameCal

     */

    public NewJFrameCal() {

        initComponents();

    }

    /**

     * This method is called from within the constructor to initialize the form.

     * WARNING: Do NOT modify this code. The content of this method is always

     * regenerated by the Form Editor.

     */

    @SuppressWarnings("unchecked")

    // <editor-fold defaultstate="collapsed" desc="Generated Code">                          

    private void initComponents() {

        jPanel4 = new javax.swing.JPanel();

        jLabel1 = new javax.swing.JLabel();

        jLabel2 = new javax.swing.JLabel();

        num1 = new javax.swing.JTextField();

        num2 = new javax.swing.JTextField();

        jPanel1 = new javax.swing.JPanel();

        add = new javax.swing.JButton();

        sub = new javax.swing.JButton();

        mul = new javax.swing.JButton();

        div = new javax.swing.JButton();

        jPanel2 = new javax.swing.JPanel();

        operasi = new javax.swing.JComboBox<>();

        counting = new javax.swing.JButton();

        jPanel5 = new javax.swing.JPanel();

        res = new javax.swing.JLabel();

        javax.swing.GroupLayout jPanel4Layout = new javax.swing.GroupLayout(jPanel4);

        jPanel4.setLayout(jPanel4Layout);

        jPanel4Layout.setHorizontalGroup(

            jPanel4Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

            .addGap(0, 100, Short.MAX_VALUE)

        );

        jPanel4Layout.setVerticalGroup(

            jPanel4Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

            .addGap(0, 100, Short.MAX_VALUE)

        );

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        setTitle("Simple Calculator 2 Options");

        setLocation(new java.awt.Point(400, 300));

        setResizable(false);

        jLabel1.setText("Number 1");

        jLabel2.setText("Number 2");

        num1.addKeyListener(new java.awt.event.KeyAdapter() {

            public void keyReleased(java.awt.event.KeyEvent evt) {

                num1KeyReleased(evt);

            }

        });

        jPanel1.setBackground(new java.awt.Color(0, 204, 204));

        add.setText("+");

        add.addActionListener(new java.awt.event.ActionListener() {

            public void actionPerformed(java.awt.event.ActionEvent evt) {

                addActionPerformed(evt);

            }

        });

        sub.setText("-");

        sub.addActionListener(new java.awt.event.ActionListener() {

            public void actionPerformed(java.awt.event.ActionEvent evt) {

                subActionPerformed(evt);

            }

        });

        mul.setText("*");

        mul.addActionListener(new java.awt.event.ActionListener() {

            public void actionPerformed(java.awt.event.ActionEvent evt) {

                mulActionPerformed(evt);

            }

        });

        div.setText("/");

        div.addActionListener(new java.awt.event.ActionListener() {

            public void actionPerformed(java.awt.event.ActionEvent evt) {

                divActionPerformed(evt);

            }

        });

        javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);

        jPanel1.setLayout(jPanel1Layout);

        jPanel1Layout.setHorizontalGroup(

            jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

            .addGroup(jPanel1Layout.createSequentialGroup()

                .addContainerGap()

                .addComponent(add)

                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)

                .addComponent(sub)

                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)

                .addComponent(mul)

                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)

                .addComponent(div)

                .addContainerGap())

        );

        jPanel1Layout.setVerticalGroup(

            jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

            .addGroup(jPanel1Layout.createSequentialGroup()

                .addContainerGap()

                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)

                    .addComponent(add)

                    .addComponent(sub)

                    .addComponent(mul)

                    .addComponent(div))

                .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))

        );

        jPanel2.setBackground(new java.awt.Color(153, 255, 255));

        operasi.setModel(new javax.swing.DefaultComboBoxModel<>(new String[] { "Add", "Sub", "Mul", "Div" }));

        counting.setText("COUNT");

        counting.addActionListener(new java.awt.event.ActionListener() {

            public void actionPerformed(java.awt.event.ActionEvent evt) {

                countingActionPerformed(evt);

            }

        });

        javax.swing.GroupLayout jPanel2Layout = new javax.swing.GroupLayout(jPanel2);

        jPanel2.setLayout(jPanel2Layout);

        jPanel2Layout.setHorizontalGroup(

            jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

            .addGroup(jPanel2Layout.createSequentialGroup()

                .addContainerGap()

                .addComponent(operasi, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)

                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)

                .addComponent(counting, javax.swing.GroupLayout.PREFERRED_SIZE, 72, javax.swing.GroupLayout.PREFERRED_SIZE)

                .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))

        );

        jPanel2Layout.setVerticalGroup(

            jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

            .addGroup(jPanel2Layout.createSequentialGroup()

                .addContainerGap()

                .addGroup(jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)

                    .addComponent(operasi, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)

                    .addComponent(counting))

                .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))

        );

        res.setFont(new java.awt.Font("Segoe UI", 1, 48)); // NOI18N

        res.setHorizontalAlignment(javax.swing.SwingConstants.CENTER);

        res.setText(" ");

        res.setAlignmentY(0.0F);

        res.setBorder(javax.swing.BorderFactory.createLineBorder(new java.awt.Color(0, 0, 0)));

        res.setHorizontalTextPosition(javax.swing.SwingConstants.CENTER);

        javax.swing.GroupLayout jPanel5Layout = new javax.swing.GroupLayout(jPanel5);

        jPanel5.setLayout(jPanel5Layout);

        jPanel5Layout.setHorizontalGroup(

            jPanel5Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

            .addComponent(res, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)

        );

        jPanel5Layout.setVerticalGroup(

            jPanel5Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

            .addComponent(res, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.PREFERRED_SIZE, 52, javax.swing.GroupLayout.PREFERRED_SIZE)

        );

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());

        getContentPane().setLayout(layout);

        layout.setHorizontalGroup(

            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

            .addGroup(layout.createSequentialGroup()

                .addContainerGap()

                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

                    .addComponent(jPanel5, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)

                    .addGroup(layout.createSequentialGroup()

                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

                            .addComponent(jLabel1)

                            .addComponent(num1, javax.swing.GroupLayout.PREFERRED_SIZE, 130, javax.swing.GroupLayout.PREFERRED_SIZE))

                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)

                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

                            .addComponent(num2, javax.swing.GroupLayout.PREFERRED_SIZE, 130, javax.swing.GroupLayout.PREFERRED_SIZE)

                            .addComponent(jLabel2)))

                    .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()

                        .addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)

                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)

                        .addComponent(jPanel2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)))

                .addContainerGap())

        );

        layout.setVerticalGroup(

            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

            .addGroup(layout.createSequentialGroup()

                .addContainerGap()

                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)

                    .addComponent(jLabel1)

                    .addComponent(jLabel2))

                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)

                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)

                    .addComponent(num1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)

                    .addComponent(num2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))

                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)

                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

                    .addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)

                    .addComponent(jPanel2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))

                .addGap(18, 18, 18)

                .addComponent(jPanel5, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)

                .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))

        );

        pack();

    }// </editor-fold>                        

    private void countingActionPerformed(java.awt.event.ActionEvent evt) {                                         

        if (operasi.getSelectedItem().toString().equalsIgnoreCase("Add")){

            int a=Integer.parseInt(num1.getText());

            int b=Integer.parseInt(num2.getText());

            int counting=a+b;

            res.setText (Integer.toString (counting));   

        }

        if (operasi.getSelectedItem().toString().equalsIgnoreCase("Sub")){

            int a=Integer.parseInt(num1.getText());

            int b=Integer.parseInt(num2.getText());

            int counting=a-b;

            res.setText (Integer.toString (counting));   

        }

        if (operasi.getSelectedItem().toString().equalsIgnoreCase("Mul")){

            int a=Integer.parseInt(num1.getText());

            int b=Integer.parseInt(num2.getText());

            int counting=a*b;

            res.setText (Integer.toString (counting));   

        }

        if (operasi.getSelectedItem().toString().equalsIgnoreCase("Div")){

            int a=Integer.parseInt(num1.getText());

            int b=Integer.parseInt(num2.getText());

            int counting=a/b;

            res.setText (Integer.toString (counting));   

        }        

    }                                        

    private void addActionPerformed(java.awt.event.ActionEvent evt) {                                    

        int a=Integer.parseInt(num1.getText());

        int b=Integer.parseInt(num2.getText());

        int counting=a+b;

        res.setText (Integer.toString (counting));

    }                                   

    private void subActionPerformed(java.awt.event.ActionEvent evt) {                                    

        int a=Integer.parseInt(num1.getText());

        int b=Integer.parseInt(num2.getText());

        int counting=a-b;

        res.setText (Integer.toString (counting));

    }                                   

    private void mulActionPerformed(java.awt.event.ActionEvent evt) {                                    

        int a=Integer.parseInt(num1.getText());

        int b=Integer.parseInt(num2.getText());

        int counting=a*b;

        res.setText (Integer.toString (counting));

    }                                   

    private void divActionPerformed(java.awt.event.ActionEvent evt) {                                    

        int a=Integer.parseInt(num1.getText());

        int b=Integer.parseInt(num2.getText());

        int counting=a/b;

        res.setText (Integer.toString (counting));

    }                                   

    /**

     * @param args the command line arguments

     */

    public static void main(String args[]) {

        /* Set the Nimbus look and feel */

        //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">

        /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.

         * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html 

         */

        try {

            for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {

                if ("Nimbus".equals(info.getName())) {

                    javax.swing.UIManager.setLookAndFeel(info.getClassName());

                    break;

                }

            }

        } catch (ClassNotFoundException ex) {

            java.util.logging.Logger.getLogger(NewJFrameCal.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);

        } catch (InstantiationException ex) {

            java.util.logging.Logger.getLogger(NewJFrameCal.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);

        } catch (IllegalAccessException ex) {

            java.util.logging.Logger.getLogger(NewJFrameCal.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);

        } catch (javax.swing.UnsupportedLookAndFeelException ex) {

            java.util.logging.Logger.getLogger(NewJFrameCal.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);

        }

        //</editor-fold>

        /* Create and display the form */

        java.awt.EventQueue.invokeLater(new Runnable() {

            public void run() {

                new NewJFrameCal().setVisible(true);

            }

        });

    }

    // Variables declaration - do not modify                     

    private javax.swing.JButton add;

    private javax.swing.JButton counting;

    private javax.swing.JButton div;

    private javax.swing.JLabel jLabel1;

    private javax.swing.JLabel jLabel2;

    private javax.swing.JPanel jPanel1;

    private javax.swing.JPanel jPanel2;

    private javax.swing.JPanel jPanel4;

    private javax.swing.JPanel jPanel5;

    private javax.swing.JButton mul;

    private javax.swing.JTextField num1;

    private javax.swing.JTextField num2;

    private javax.swing.JComboBox<String> operasi;

    private javax.swing.JLabel res;

    private javax.swing.JButton sub;

    // End of variables declaration                   

}

Untuk lebih memahaminya silahkan kunjungi Youtube

Operasi Matematika Dasar

Operasi Matematika Dasar yang perlu kita ketahui atau dipelajari yakni,

Penjumlahan
Simbol operator: Tambah ( + )
Contoh: 1 + 1

Pengurangan
Simbol operator: Kurang ( - )
Contoh: 1 - 1

Perkalian
Simbol operator: Kali ( x atau * )
Contoh: 1 x 1

Pembagian
Simbol operator: Bagi ( : atau / )
Contoh: 1 : 1

Hasil dari operasi matematika dasar ini akan diberikan tanda atau operator dengan istilah sama dengan yang memiliki simbol ( = ).
Contoh: 
1 + 1 = 2
1 - 1 = 0
1 x 1 = 1
1 : 1 = 1

Untuk lebih memahaminya, kami berikan video pembahasannya agar lebih mudah dimengerti

Operator hasil di atas merupakan bagian dari operasi perbandingan. Selain itu, ada beberapa tanda pembanding lainnya yang termasuk dalam operasi perbandingan, antara lain:

Sama Dengan
Simbol operator: ( = )
Contoh: 1 = 1

Lebih Besar
Simbol operator: ( > )
Contoh: 1 > 0

Lebih Kecil
Simbol operator: ( < )
Contoh: 1 < 0

Lebih Besar Sama Dengan
Simbol operator: ( >= atau ≥ )
Contoh: 2 > a >= 0
contoh ini berarti bahwa 2 lebih besar dari nilai a yang lebih besar atau sama dengan 0, sehingga a bisa saja memiliki nilai 0 atau 1 dan tidak lebih besar dari 2.

Lebih Kecil Sama Dengan
Simbol operator: ( <= atau ≤ )
Contoh: 0 < a <= 2
contoh ini berarti bahwa 0 lebih kecil dari nilai a yang lebih kecil atau sama dengan 2, sehingga a bisa saja memiliki nilai 1 atau 2 dan tidak lebih kecil dari 0.

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