{"id":135084,"date":"2024-04-27T18:13:55","date_gmt":"2024-04-27T12:43:55","guid":{"rendered":"https:\/\/data-flair.training\/blogs\/?p=135084"},"modified":"2024-04-27T18:13:55","modified_gmt":"2024-04-27T12:43:55","slug":"java-gui-calculator-with-source-code","status":"publish","type":"post","link":"https:\/\/data-flair.training\/blogs\/java-gui-calculator-with-source-code\/","title":{"rendered":"Java Project – GUI Calculator with Source Code"},"content":{"rendered":"

Program 1<\/h3>\n
\/*\r\n * To change this license header, choose License Headers in Project Properties.\r\n * To change this template file, choose Tools | Templates\r\n * and open the template in the editor.\r\n *\/\r\n\r\npackage dataflair;\r\n\r\n\/**\r\n *\r\n * @author admin\r\n *\/\r\npublic class Calculator extends javax.swing.JFrame {\r\n\r\n      double num1=0,num2=0;\r\n      double ans=0;\r\n      String operator;\r\n    public Calculator() {\r\n        initComponents();\r\n    }\r\n\r\n    \/**\r\n     * This method is called from within the constructor to initialize the form.\r\n     * WARNING: Do NOT modify this code. The content of this method is always\r\n     * regenerated by the Form Editor.\r\n     *\/\r\n    @SuppressWarnings(\"unchecked\")\r\n    \/\/ <editor-fold defaultstate=\"collapsed\" desc=\"Generated Code\">\/\/GEN-BEGIN:initComponents\r\n    private void initComponents() {\r\n\r\n        jPanel1 = new javax.swing.JPanel();\r\n        txtoutput = new javax.swing.JTextField();\r\n        btn1 = new javax.swing.JButton();\r\n        btn2 = new javax.swing.JButton();\r\n        btn3 = new javax.swing.JButton();\r\n        btn4 = new javax.swing.JButton();\r\n        btn5 = new javax.swing.JButton();\r\n        btn6 = new javax.swing.JButton();\r\n        btn7 = new javax.swing.JButton();\r\n        btn8 = new javax.swing.JButton();\r\n        btn9 = new javax.swing.JButton();\r\n        btn0 = new javax.swing.JButton();\r\n        btnc = new javax.swing.JButton();\r\n        btndot = new javax.swing.JButton();\r\n        btnplus = new javax.swing.JButton();\r\n        btnminus = new javax.swing.JButton();\r\n        btnmulti = new javax.swing.JButton();\r\n        btndevide = new javax.swing.JButton();\r\n        btnce = new javax.swing.JButton();\r\n        btnequal = new javax.swing.JButton();\r\n        jCheckBox1 = new javax.swing.JCheckBox();\r\n        btnback = new javax.swing.JButton();\r\n\r\n        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);\r\n        setTitle(\"Calculator \");\r\n\r\n        txtoutput.setEditable(false);\r\n        txtoutput.setFont(new java.awt.Font(\"Tahoma\", 1, 24)); \/\/ NOI18N\r\n        txtoutput.setHorizontalAlignment(javax.swing.JTextField.RIGHT);\r\n\r\n        btn1.setFont(new java.awt.Font(\"Tahoma\", 1, 24)); \/\/ NOI18N\r\n        btn1.setText(\"1\");\r\n        btn1.setToolTipText(\"\");\r\n        btn1.addActionListener(new java.awt.event.ActionListener() {\r\n            public void actionPerformed(java.awt.event.ActionEvent evt) {\r\n                btn1ActionPerformed(evt);\r\n            }\r\n        });\r\n\r\n        btn2.setFont(new java.awt.Font(\"Tahoma\", 1, 24)); \/\/ NOI18N\r\n        btn2.setText(\"2\");\r\n        btn2.addActionListener(new java.awt.event.ActionListener() {\r\n            public void actionPerformed(java.awt.event.ActionEvent evt) {\r\n                btn2ActionPerformed(evt);\r\n            }\r\n        });\r\n\r\n        btn3.setFont(new java.awt.Font(\"Tahoma\", 1, 24)); \/\/ NOI18N\r\n        btn3.setText(\"3\");\r\n        btn3.addActionListener(new java.awt.event.ActionListener() {\r\n            public void actionPerformed(java.awt.event.ActionEvent evt) {\r\n                btn3ActionPerformed(evt);\r\n            }\r\n        });\r\n\r\n        btn4.setFont(new java.awt.Font(\"Tahoma\", 1, 24)); \/\/ NOI18N\r\n        btn4.setText(\"4\");\r\n        btn4.addActionListener(new java.awt.event.ActionListener() {\r\n            public void actionPerformed(java.awt.event.ActionEvent evt) {\r\n                btn4ActionPerformed(evt);\r\n            }\r\n        });\r\n\r\n        btn5.setFont(new java.awt.Font(\"Tahoma\", 1, 24)); \/\/ NOI18N\r\n        btn5.setText(\"5\");\r\n        btn5.addActionListener(new java.awt.event.ActionListener() {\r\n            public void actionPerformed(java.awt.event.ActionEvent evt) {\r\n                btn5ActionPerformed(evt);\r\n            }\r\n        });\r\n\r\n        btn6.setFont(new java.awt.Font(\"Tahoma\", 1, 24)); \/\/ NOI18N\r\n        btn6.setText(\"6\");\r\n        btn6.addActionListener(new java.awt.event.ActionListener() {\r\n            public void actionPerformed(java.awt.event.ActionEvent evt) {\r\n                btn6ActionPerformed(evt);\r\n            }\r\n        });\r\n\r\n        btn7.setFont(new java.awt.Font(\"Tahoma\", 1, 24)); \/\/ NOI18N\r\n        btn7.setText(\"7\");\r\n        btn7.addActionListener(new java.awt.event.ActionListener() {\r\n            public void actionPerformed(java.awt.event.ActionEvent evt) {\r\n                btn7ActionPerformed(evt);\r\n            }\r\n        });\r\n\r\n        btn8.setFont(new java.awt.Font(\"Tahoma\", 1, 24)); \/\/ NOI18N\r\n        btn8.setText(\"8\");\r\n        btn8.addActionListener(new java.awt.event.ActionListener() {\r\n            public void actionPerformed(java.awt.event.ActionEvent evt) {\r\n                btn8ActionPerformed(evt);\r\n            }\r\n        });\r\n\r\n        btn9.setFont(new java.awt.Font(\"Tahoma\", 1, 24)); \/\/ NOI18N\r\n        btn9.setText(\"9\");\r\n        btn9.addActionListener(new java.awt.event.ActionListener() {\r\n            public void actionPerformed(java.awt.event.ActionEvent evt) {\r\n                btn9ActionPerformed(evt);\r\n            }\r\n        });\r\n\r\n        btn0.setFont(new java.awt.Font(\"Tahoma\", 1, 24)); \/\/ NOI18N\r\n        btn0.setText(\"0\");\r\n        btn0.addActionListener(new java.awt.event.ActionListener() {\r\n            public void actionPerformed(java.awt.event.ActionEvent evt) {\r\n                btn0ActionPerformed(evt);\r\n            }\r\n        });\r\n\r\n        btnc.setFont(new java.awt.Font(\"Tahoma\", 1, 24)); \/\/ NOI18N\r\n        btnc.setText(\"C\");\r\n        btnc.addActionListener(new java.awt.event.ActionListener() {\r\n            public void actionPerformed(java.awt.event.ActionEvent evt) {\r\n                btncActionPerformed(evt);\r\n            }\r\n        });\r\n\r\n        btndot.setFont(new java.awt.Font(\"Tahoma\", 1, 24)); \/\/ NOI18N\r\n        btndot.setText(\".\");\r\n        btndot.addActionListener(new java.awt.event.ActionListener() {\r\n            public void actionPerformed(java.awt.event.ActionEvent evt) {\r\n                btndotActionPerformed(evt);\r\n            }\r\n        });\r\n\r\n        btnplus.setFont(new java.awt.Font(\"Tahoma\", 1, 24)); \/\/ NOI18N\r\n        btnplus.setText(\"+\");\r\n        btnplus.addActionListener(new java.awt.event.ActionListener() {\r\n            public void actionPerformed(java.awt.event.ActionEvent evt) {\r\n                btnplusActionPerformed(evt);\r\n            }\r\n        });\r\n\r\n        btnminus.setFont(new java.awt.Font(\"Tahoma\", 1, 24)); \/\/ NOI18N\r\n        btnminus.setText(\"-\");\r\n        btnminus.addActionListener(new java.awt.event.ActionListener() {\r\n            public void actionPerformed(java.awt.event.ActionEvent evt) {\r\n                btnminusActionPerformed(evt);\r\n            }\r\n        });\r\n\r\n        btnmulti.setFont(new java.awt.Font(\"Tahoma\", 1, 24)); \/\/ NOI18N\r\n        btnmulti.setText(\"*\");\r\n        btnmulti.addActionListener(new java.awt.event.ActionListener() {\r\n            public void actionPerformed(java.awt.event.ActionEvent evt) {\r\n                btnmultiActionPerformed(evt);\r\n            }\r\n        });\r\n\r\n        btndevide.setFont(new java.awt.Font(\"Tahoma\", 1, 24)); \/\/ NOI18N\r\n        btndevide.setText(\"\/\");\r\n        btndevide.addActionListener(new java.awt.event.ActionListener() {\r\n            public void actionPerformed(java.awt.event.ActionEvent evt) {\r\n                btndevideActionPerformed(evt);\r\n            }\r\n        });\r\n\r\n        btnce.setFont(new java.awt.Font(\"Tahoma\", 1, 24)); \/\/ NOI18N\r\n        btnce.setText(\"CE\");\r\n\r\n        btnequal.setFont(new java.awt.Font(\"Tahoma\", 1, 24)); \/\/ NOI18N\r\n        btnequal.setText(\"=\");\r\n        btnequal.addActionListener(new java.awt.event.ActionListener() {\r\n            public void actionPerformed(java.awt.event.ActionEvent evt) {\r\n                btnequalActionPerformed(evt);\r\n            }\r\n        });\r\n\r\n        jCheckBox1.setText(\"On\/OFF\");\r\n        jCheckBox1.addChangeListener(new javax.swing.event.ChangeListener() {\r\n            public void stateChanged(javax.swing.event.ChangeEvent evt) {\r\n                jCheckBox1StateChanged(evt);\r\n            }\r\n        });\r\n\r\n        btnback.setFont(new java.awt.Font(\"Tahoma\", 1, 24)); \/\/ NOI18N\r\n        btnback.setText(\"<\");\r\n        btnback.addActionListener(new java.awt.event.ActionListener() {\r\n            public void actionPerformed(java.awt.event.ActionEvent evt) {\r\n                btnbackActionPerformed(evt);\r\n            }\r\n        });\r\n\r\n        javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);\r\n        jPanel1.setLayout(jPanel1Layout);\r\n        jPanel1Layout.setHorizontalGroup(\r\n            jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)\r\n            .addGroup(jPanel1Layout.createSequentialGroup()\r\n                .addContainerGap()\r\n                .addComponent(txtoutput))\r\n            .addGroup(jPanel1Layout.createSequentialGroup()\r\n                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)\r\n                    .addGroup(jPanel1Layout.createSequentialGroup()\r\n                        .addGap(75, 75, 75)\r\n                        .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)\r\n                            .addGroup(jPanel1Layout.createSequentialGroup()\r\n                                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)\r\n                                    .addGroup(jPanel1Layout.createSequentialGroup()\r\n                                        .addComponent(btn4, javax.swing.GroupLayout.PREFERRED_SIZE, 60, javax.swing.GroupLayout.PREFERRED_SIZE)\r\n                                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)\r\n                                        .addComponent(btn5, javax.swing.GroupLayout.PREFERRED_SIZE, 60, javax.swing.GroupLayout.PREFERRED_SIZE)\r\n                                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)\r\n                                        .addComponent(btn6, javax.swing.GroupLayout.PREFERRED_SIZE, 60, javax.swing.GroupLayout.PREFERRED_SIZE))\r\n                                    .addGroup(jPanel1Layout.createSequentialGroup()\r\n                                        .addComponent(btn1, javax.swing.GroupLayout.PREFERRED_SIZE, 60, javax.swing.GroupLayout.PREFERRED_SIZE)\r\n                                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)\r\n                                        .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)\r\n                                            .addGroup(jPanel1Layout.createSequentialGroup()\r\n                                                .addComponent(btn0, javax.swing.GroupLayout.PREFERRED_SIZE, 60, javax.swing.GroupLayout.PREFERRED_SIZE)\r\n                                                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)\r\n                                                .addComponent(btndot, javax.swing.GroupLayout.PREFERRED_SIZE, 60, javax.swing.GroupLayout.PREFERRED_SIZE))\r\n                                            .addGroup(jPanel1Layout.createSequentialGroup()\r\n                                                .addComponent(btn2, javax.swing.GroupLayout.PREFERRED_SIZE, 60, javax.swing.GroupLayout.PREFERRED_SIZE)\r\n                                                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)\r\n                                                .addComponent(btn3, javax.swing.GroupLayout.PREFERRED_SIZE, 60, javax.swing.GroupLayout.PREFERRED_SIZE)))))\r\n                                .addGap(22, 22, 22))\r\n                            .addGroup(jPanel1Layout.createSequentialGroup()\r\n                                .addComponent(btn7, javax.swing.GroupLayout.PREFERRED_SIZE, 60, javax.swing.GroupLayout.PREFERRED_SIZE)\r\n                                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)\r\n                                .addComponent(btn8, javax.swing.GroupLayout.PREFERRED_SIZE, 60, javax.swing.GroupLayout.PREFERRED_SIZE)\r\n                                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)\r\n                                .addComponent(btn9, javax.swing.GroupLayout.PREFERRED_SIZE, 60, javax.swing.GroupLayout.PREFERRED_SIZE)\r\n                                .addGap(22, 22, 22))\r\n                            .addGroup(jPanel1Layout.createSequentialGroup()\r\n                                .addComponent(btnback)\r\n                                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)\r\n                                .addComponent(btnce)\r\n                                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)\r\n                                .addComponent(btnc, javax.swing.GroupLayout.PREFERRED_SIZE, 60, javax.swing.GroupLayout.PREFERRED_SIZE)\r\n                                .addGap(19, 19, 19)))\r\n                        .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)\r\n                            .addGroup(jPanel1Layout.createSequentialGroup()\r\n                                .addComponent(btnplus, javax.swing.GroupLayout.PREFERRED_SIZE, 60, javax.swing.GroupLayout.PREFERRED_SIZE)\r\n                                .addGap(18, 18, 18)\r\n                                .addComponent(btnequal, javax.swing.GroupLayout.PREFERRED_SIZE, 125, javax.swing.GroupLayout.PREFERRED_SIZE))\r\n                            .addComponent(btnminus, javax.swing.GroupLayout.PREFERRED_SIZE, 60, javax.swing.GroupLayout.PREFERRED_SIZE)\r\n                            .addComponent(btnmulti, javax.swing.GroupLayout.PREFERRED_SIZE, 60, javax.swing.GroupLayout.PREFERRED_SIZE)\r\n                            .addComponent(btndevide, javax.swing.GroupLayout.PREFERRED_SIZE, 60, javax.swing.GroupLayout.PREFERRED_SIZE)))\r\n                    .addGroup(jPanel1Layout.createSequentialGroup()\r\n                        .addGap(34, 34, 34)\r\n                        .addComponent(jCheckBox1)))\r\n                .addGap(0, 170, Short.MAX_VALUE))\r\n        );\r\n        jPanel1Layout.setVerticalGroup(\r\n            jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)\r\n            .addGroup(jPanel1Layout.createSequentialGroup()\r\n                .addComponent(txtoutput, javax.swing.GroupLayout.PREFERRED_SIZE, 55, javax.swing.GroupLayout.PREFERRED_SIZE)\r\n                .addGap(18, 18, 18)\r\n                .addComponent(jCheckBox1)\r\n                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 112, Short.MAX_VALUE)\r\n                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)\r\n                    .addGroup(jPanel1Layout.createSequentialGroup()\r\n                        .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)\r\n                            .addComponent(btnc, javax.swing.GroupLayout.PREFERRED_SIZE, 35, javax.swing.GroupLayout.PREFERRED_SIZE)\r\n                            .addComponent(btnce, javax.swing.GroupLayout.PREFERRED_SIZE, 35, javax.swing.GroupLayout.PREFERRED_SIZE)\r\n                            .addComponent(btnback, javax.swing.GroupLayout.PREFERRED_SIZE, 35, javax.swing.GroupLayout.PREFERRED_SIZE))\r\n                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)\r\n                        .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)\r\n                            .addComponent(btn7, javax.swing.GroupLayout.PREFERRED_SIZE, 35, javax.swing.GroupLayout.PREFERRED_SIZE)\r\n                            .addComponent(btn8, javax.swing.GroupLayout.PREFERRED_SIZE, 35, javax.swing.GroupLayout.PREFERRED_SIZE)\r\n                            .addComponent(btn9, javax.swing.GroupLayout.PREFERRED_SIZE, 35, javax.swing.GroupLayout.PREFERRED_SIZE))\r\n                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)\r\n                        .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)\r\n                            .addComponent(btn4, javax.swing.GroupLayout.PREFERRED_SIZE, 35, javax.swing.GroupLayout.PREFERRED_SIZE)\r\n                            .addComponent(btn5, javax.swing.GroupLayout.PREFERRED_SIZE, 35, javax.swing.GroupLayout.PREFERRED_SIZE)\r\n                            .addComponent(btn6, javax.swing.GroupLayout.PREFERRED_SIZE, 35, javax.swing.GroupLayout.PREFERRED_SIZE))\r\n                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)\r\n                        .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)\r\n                            .addComponent(btn1, javax.swing.GroupLayout.PREFERRED_SIZE, 35, javax.swing.GroupLayout.PREFERRED_SIZE)\r\n                            .addComponent(btn2, javax.swing.GroupLayout.PREFERRED_SIZE, 35, javax.swing.GroupLayout.PREFERRED_SIZE)\r\n                            .addComponent(btn3, javax.swing.GroupLayout.PREFERRED_SIZE, 35, javax.swing.GroupLayout.PREFERRED_SIZE))\r\n                        .addGap(4, 4, 4)\r\n                        .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)\r\n                            .addComponent(btn0, javax.swing.GroupLayout.PREFERRED_SIZE, 35, javax.swing.GroupLayout.PREFERRED_SIZE)\r\n                            .addComponent(btndot, javax.swing.GroupLayout.PREFERRED_SIZE, 35, javax.swing.GroupLayout.PREFERRED_SIZE)))\r\n                    .addGroup(jPanel1Layout.createSequentialGroup()\r\n                        .addComponent(btndevide, javax.swing.GroupLayout.PREFERRED_SIZE, 35, javax.swing.GroupLayout.PREFERRED_SIZE)\r\n                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)\r\n                        .addComponent(btnmulti, javax.swing.GroupLayout.PREFERRED_SIZE, 35, javax.swing.GroupLayout.PREFERRED_SIZE)\r\n                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)\r\n                        .addComponent(btnminus, javax.swing.GroupLayout.PREFERRED_SIZE, 35, javax.swing.GroupLayout.PREFERRED_SIZE)\r\n                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)\r\n                        .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)\r\n                            .addComponent(btnplus, javax.swing.GroupLayout.PREFERRED_SIZE, 35, javax.swing.GroupLayout.PREFERRED_SIZE)\r\n                            .addComponent(btnequal, javax.swing.GroupLayout.PREFERRED_SIZE, 35, javax.swing.GroupLayout.PREFERRED_SIZE))\r\n                        .addContainerGap())))\r\n        );\r\n\r\n        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());\r\n        getContentPane().setLayout(layout);\r\n        layout.setHorizontalGroup(\r\n            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)\r\n            .addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)\r\n        );\r\n        layout.setVerticalGroup(\r\n            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)\r\n            .addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)\r\n        );\r\n\r\n        pack();\r\n    }\/\/ <\/editor-fold>\/\/GEN-END:initComponents\r\n\r\n    private void btn1ActionPerformed(java.awt.event.ActionEvent evt) {\/\/GEN-FIRST:event_btn1ActionPerformed\r\n        \/\/ TODO add your handling code here:\r\n        txtoutput.setText(txtoutput.getText()+\"1\");\r\n    }\/\/GEN-LAST:event_btn1ActionPerformed\r\n\r\n    private void btn2ActionPerformed(java.awt.event.ActionEvent evt) {\/\/GEN-FIRST:event_btn2ActionPerformed\r\n        \/\/ TODO add your handling code here:\r\n         txtoutput.setText(txtoutput.getText()+\"2\");\r\n    }\/\/GEN-LAST:event_btn2ActionPerformed\r\n\r\n    private void btn3ActionPerformed(java.awt.event.ActionEvent evt) {\/\/GEN-FIRST:event_btn3ActionPerformed\r\n        \/\/ TODO add your handling code here:\r\n        txtoutput.setText(txtoutput.getText()+\"3\");\r\n    }\/\/GEN-LAST:event_btn3ActionPerformed\r\n\r\n    private void btn4ActionPerformed(java.awt.event.ActionEvent evt) {\/\/GEN-FIRST:event_btn4ActionPerformed\r\n        \/\/ TODO add your handling code here:\r\n        txtoutput.setText(txtoutput.getText()+\"4\");\r\n    }\/\/GEN-LAST:event_btn4ActionPerformed\r\n\r\n    private void btn5ActionPerformed(java.awt.event.ActionEvent evt) {\/\/GEN-FIRST:event_btn5ActionPerformed\r\n        \/\/ TODO add your handling code here:\r\n        txtoutput.setText(txtoutput.getText()+\"5\");\r\n    }\/\/GEN-LAST:event_btn5ActionPerformed\r\n\r\n    private void btn6ActionPerformed(java.awt.event.ActionEvent evt) {\/\/GEN-FIRST:event_btn6ActionPerformed\r\n        \/\/ TODO add your handling code here:\r\n        txtoutput.setText(txtoutput.getText()+\"6\");\r\n    }\/\/GEN-LAST:event_btn6ActionPerformed\r\n\r\n    private void btn7ActionPerformed(java.awt.event.ActionEvent evt) {\/\/GEN-FIRST:event_btn7ActionPerformed\r\n        \/\/ TODO add your handling code here:\r\n        txtoutput.setText(txtoutput.getText()+\"7\");\r\n    }\/\/GEN-LAST:event_btn7ActionPerformed\r\n\r\n    private void btn8ActionPerformed(java.awt.event.ActionEvent evt) {\/\/GEN-FIRST:event_btn8ActionPerformed\r\n        \/\/ TODO add your handling code here:\r\n        txtoutput.setText(txtoutput.getText()+\"8\");\r\n    }\/\/GEN-LAST:event_btn8ActionPerformed\r\n\r\n    private void btn9ActionPerformed(java.awt.event.ActionEvent evt) {\/\/GEN-FIRST:event_btn9ActionPerformed\r\n        \/\/ TODO add your handling code here:\r\n        txtoutput.setText(txtoutput.getText()+\"9\");\r\n    }\/\/GEN-LAST:event_btn9ActionPerformed\r\n\r\n    private void btn0ActionPerformed(java.awt.event.ActionEvent evt) {\/\/GEN-FIRST:event_btn0ActionPerformed\r\n        \/\/ TODO add your handling code here:\r\n        txtoutput.setText(txtoutput.getText()+\"0\");\r\n    }\/\/GEN-LAST:event_btn0ActionPerformed\r\n\r\n    private void btndotActionPerformed(java.awt.event.ActionEvent evt) {\/\/GEN-FIRST:event_btndotActionPerformed\r\n        \/\/ TODO add your handling code here:\r\n        txtoutput.setText(txtoutput.getText()+\".\");\r\n    }\/\/GEN-LAST:event_btndotActionPerformed\r\n\r\n    private void btncActionPerformed(java.awt.event.ActionEvent evt) {\/\/GEN-FIRST:event_btncActionPerformed\r\n        \/\/ TODO add your handling code here:\r\n            txtoutput.setText(\"\");\r\n    }\/\/GEN-LAST:event_btncActionPerformed\r\n\r\n    private void btnplusActionPerformed(java.awt.event.ActionEvent evt) {\/\/GEN-FIRST:event_btnplusActionPerformed\r\n        \/\/ TODO add your handling code here:\r\n         \/\/txtoutput.setText(txtoutput.getText()+\"+\");\r\n            num1=Double.parseDouble(txtoutput.getText());\r\n            txtoutput.setText(\"\");\r\n            operator=\"+\";\r\n    }\/\/GEN-LAST:event_btnplusActionPerformed\r\n\r\n    private void btnminusActionPerformed(java.awt.event.ActionEvent evt) {\/\/GEN-FIRST:event_btnminusActionPerformed\r\n        \/\/ TODO add your handling code here:\r\n         \/\/txtoutput.setText(txtoutput.getText()+\"-\");\r\n        num1=Double.parseDouble(txtoutput.getText());\r\n            txtoutput.setText(\"\");\r\n            operator=\"-\";\r\n    }\/\/GEN-LAST:event_btnminusActionPerformed\r\n\r\n    private void btnmultiActionPerformed(java.awt.event.ActionEvent evt) {\/\/GEN-FIRST:event_btnmultiActionPerformed\r\n        \/\/ TODO add your handling code here:\r\n         \/\/txtoutput.setText(txtoutput.getText()+\"*\");\r\n        num1=Double.parseDouble(txtoutput.getText());\r\n            txtoutput.setText(\"\");\r\n            operator=\"*\";\r\n         \r\n    }\/\/GEN-LAST:event_btnmultiActionPerformed\r\n\r\n    private void btndevideActionPerformed(java.awt.event.ActionEvent evt) {\/\/GEN-FIRST:event_btndevideActionPerformed\r\n        \/\/ TODO add your handling code here:\r\n        \/\/ txtoutput.setText(txtoutput.getText()+\"\/\");\r\n        num1=Double.parseDouble(txtoutput.getText());\r\n            txtoutput.setText(\"\");\r\n            operator=\"\/\";\r\n    }\/\/GEN-LAST:event_btndevideActionPerformed\r\n\r\n    private void jCheckBox1StateChanged(javax.swing.event.ChangeEvent evt) {\/\/GEN-FIRST:event_jCheckBox1StateChanged\r\n        \/\/ TODO add your handling code here:\r\n        if(jCheckBox1.isSelected())\r\n            disablecalc();\r\n        else\r\n            enablecalc();\r\n    }\/\/GEN-LAST:event_jCheckBox1StateChanged\r\n\r\n    private void btnbackActionPerformed(java.awt.event.ActionEvent evt) {\/\/GEN-FIRST:event_btnbackActionPerformed\r\n        \/\/ TODO add your handling code here:\r\n        int txtlength=txtoutput.getText().length();\r\n        int txtnumber=txtoutput.getText().length()-1;\r\n        if(txtlength>0)\r\n        {\r\n            StringBuilder sb=new StringBuilder(txtoutput.getText());\r\n            sb.deleteCharAt(txtnumber);\r\n            String str;\r\n            str=sb.toString();\r\n            txtoutput.setText(str);\r\n        }\r\n    }\/\/GEN-LAST:event_btnbackActionPerformed\r\n\r\n    private void btnequalActionPerformed(java.awt.event.ActionEvent evt) {\/\/GEN-FIRST:event_btnequalActionPerformed\r\n        \/\/ TODO add your handling code here:\r\n        num2=Double.parseDouble(txtoutput.getText());\r\n        switch(operator)\r\n        {\r\n            case \"+\":\r\n                   ans=num1+num2;break;\r\n            case \"-\":\r\n                   ans=num1-num2;break;\r\n           case \"*\":\r\n                   ans=num1*num2;break;\r\n           case \"\/\":\r\n                   ans=num1\/num2;break;\r\n   \r\n        }\r\n       txtoutput.setText(Double.toString(ans));\r\n       ans=0;\r\n       operator=null;\r\n    }\/\/GEN-LAST:event_btnequalActionPerformed\r\n    public void disablecalc()\r\n    {\r\n        btn0.setEnabled(false);\r\n        btn1.setEnabled(false);\r\n        btn2.setEnabled(false);\r\n        btn3.setEnabled(false);\r\n        btn4.setEnabled(false);\r\n        btn5.setEnabled(false);\r\n        btn6.setEnabled(false);\r\n        btn7.setEnabled(false);\r\n        btn8.setEnabled(false);\r\n        btn9.setEnabled(false);\r\n        btndot.setEnabled(false);\r\n        btnplus.setEnabled(false);\r\n        btnminus.setEnabled(false);\r\n        btndevide.setEnabled(false);\r\n        btnmulti.setEnabled(false);\r\n         btnequal.setEnabled(false);\r\n         btnc.setEnabled(false);\r\n         btnce.setEnabled(false);\r\n    }\r\n    public void enablecalc()\r\n    {\r\n        btn0.setEnabled(true);\r\n        btn1.setEnabled(true);\r\n        btn2.setEnabled(true);\r\n        btn3.setEnabled(true);\r\n        btn4.setEnabled(true);\r\n        btn5.setEnabled(true);\r\n        btn6.setEnabled(true);\r\n        btn7.setEnabled(true);\r\n        btn8.setEnabled(true);\r\n        btn9.setEnabled(true);\r\n        btndot.setEnabled(true);\r\n        btnplus.setEnabled(true);\r\n        btnminus.setEnabled(true);\r\n        btndevide.setEnabled(true);\r\n        btnmulti.setEnabled(true);\r\n        btnequal.setEnabled(true);\r\n        btnc.setEnabled(true);\r\n        btnce.setEnabled(true);\r\n    }\r\n    \r\n    \r\n    \r\n    \/**\r\n     * @param args the command line arguments\r\n     *\/\r\n    public static void main(String args[]) {\r\n        \/* Set the Nimbus look and feel *\/\r\n        \/\/<editor-fold defaultstate=\"collapsed\" desc=\" Look and feel setting code (optional) \">\r\n        \/* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.\r\n         * For details see http:\/\/download.oracle.com\/javase\/tutorial\/uiswing\/lookandfeel\/plaf.html \r\n         *\/\r\n        try {\r\n            for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {\r\n                if (\"Nimbus\".equals(info.getName())) {\r\n                    javax.swing.UIManager.setLookAndFeel(info.getClassName());\r\n                    break;\r\n                }\r\n            }\r\n        } catch (ClassNotFoundException ex) {\r\n            java.util.logging.Logger.getLogger(Calculator.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);\r\n        } catch (InstantiationException ex) {\r\n            java.util.logging.Logger.getLogger(Calculator.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);\r\n        } catch (IllegalAccessException ex) {\r\n            java.util.logging.Logger.getLogger(Calculator.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);\r\n        } catch (javax.swing.UnsupportedLookAndFeelException ex) {\r\n            java.util.logging.Logger.getLogger(Calculator.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);\r\n        }\r\n        \/\/<\/editor-fold>\r\n\r\n        \/* Create and display the form *\/\r\n        java.awt.EventQueue.invokeLater(new Runnable() {\r\n            public void run() {\r\n                new Calculator().setVisible(true);\r\n            }\r\n        });\r\n    }\r\n\r\n    \/\/ Variables declaration - do not modify\/\/GEN-BEGIN:variables\r\n    private javax.swing.JButton btn0;\r\n    private javax.swing.JButton btn1;\r\n    private javax.swing.JButton btn2;\r\n    private javax.swing.JButton btn3;\r\n    private javax.swing.JButton btn4;\r\n    private javax.swing.JButton btn5;\r\n    private javax.swing.JButton btn6;\r\n    private javax.swing.JButton btn7;\r\n    private javax.swing.JButton btn8;\r\n    private javax.swing.JButton btn9;\r\n    private javax.swing.JButton btnback;\r\n    private javax.swing.JButton btnc;\r\n    private javax.swing.JButton btnce;\r\n    private javax.swing.JButton btndevide;\r\n    private javax.swing.JButton btndot;\r\n    private javax.swing.JButton btnequal;\r\n    private javax.swing.JButton btnminus;\r\n    private javax.swing.JButton btnmulti;\r\n    private javax.swing.JButton btnplus;\r\n    private javax.swing.JCheckBox jCheckBox1;\r\n    private javax.swing.JPanel jPanel1;\r\n    private javax.swing.JTextField txtoutput;\r\n    \/\/ End of variables declaration\/\/GEN-END:variables\r\n}<\/pre>\n
 <\/p>\n","protected":false},"excerpt":{"rendered":"
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