In this article I am going to demonstrate how to make a calculator in Java. Below I have shared the simple calculator program in java using swing. It is a simple calculator in Java which can perform basic arithmetic operations like addition, subtraction, multiplication and division of two numbers. If you are getting any difficulty to understand or run this program then comment below, I will try to solve problem.
Program to Make a Calculator in Java Using Swing
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 | import javax.swing.*; import java.awt.event.*; class Calc extends JFrame implements ActionListener { JFrame f; JTextField t; JButton b1,b2,b3,b4,b5,b6,b7,b8,b9,b0,bdiv,bmul,bsub,badd,bdec,beq,bdel,bclr; static double a=0,b=0,result=0; static int operator=0; Calc() { f=new JFrame("Calculator"); t=new JTextField(); b1=new JButton("1"); b2=new JButton("2"); b3=new JButton("3"); b4=new JButton("4"); b5=new JButton("5"); b6=new JButton("6"); b7=new JButton("7"); b8=new JButton("8"); b9=new JButton("9"); b0=new JButton("0"); bdiv=new JButton("/"); bmul=new JButton("*"); bsub=new JButton("-"); badd=new JButton("+"); bdec=new JButton("."); beq=new JButton("="); bdel=new JButton("Delete"); bclr=new JButton("Clear"); t.setBounds(30,40,280,30); b7.setBounds(40,100,50,40); b8.setBounds(110,100,50,40); b9.setBounds(180,100,50,40); bdiv.setBounds(250,100,50,40); b4.setBounds(40,170,50,40); b5.setBounds(110,170,50,40); b6.setBounds(180,170,50,40); bmul.setBounds(250,170,50,40); b1.setBounds(40,240,50,40); b2.setBounds(110,240,50,40); b3.setBounds(180,240,50,40); bsub.setBounds(250,240,50,40); bdec.setBounds(40,310,50,40); b0.setBounds(110,310,50,40); beq.setBounds(180,310,50,40); badd.setBounds(250,310,50,40); bdel.setBounds(60,380,100,40); bclr.setBounds(180,380,100,40); f.add(t); f.add(b7); f.add(b8); f.add(b9); f.add(bdiv); f.add(b4); f.add(b5); f.add(b6); f.add(bmul); f.add(b1); f.add(b2); f.add(b3); f.add(bsub); f.add(bdec); f.add(b0); f.add(beq); f.add(badd); f.add(bdel); f.add(bclr); f.setLayout(null); f.setVisible(true); f.setSize(350,500); f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); f.setResizable(false); b1.addActionListener(this); b2.addActionListener(this); b3.addActionListener(this); b4.addActionListener(this); b5.addActionListener(this); b6.addActionListener(this); b7.addActionListener(this); b8.addActionListener(this); b9.addActionListener(this); b0.addActionListener(this); badd.addActionListener(this); bdiv.addActionListener(this); bmul.addActionListener(this); bsub.addActionListener(this); bdec.addActionListener(this); beq.addActionListener(this); bdel.addActionListener(this); bclr.addActionListener(this); } public void actionPerformed(ActionEvent e) { if(e.getSource()==b1) t.setText(t.getText().concat("1")); if(e.getSource()==b2) t.setText(t.getText().concat("2")); if(e.getSource()==b3) t.setText(t.getText().concat("3")); if(e.getSource()==b4) t.setText(t.getText().concat("4")); if(e.getSource()==b5) t.setText(t.getText().concat("5")); if(e.getSource()==b6) t.setText(t.getText().concat("6")); if(e.getSource()==b7) t.setText(t.getText().concat("7")); if(e.getSource()==b8) t.setText(t.getText().concat("8")); if(e.getSource()==b9) t.setText(t.getText().concat("9")); if(e.getSource()==b0) t.setText(t.getText().concat("0")); if(e.getSource()==bdec) t.setText(t.getText().concat(".")); if(e.getSource()==badd) { a=Double.parseDouble(t.getText()); operator=1; t.setText(""); } if(e.getSource()==bsub) { a=Double.parseDouble(t.getText()); operator=2; t.setText(""); } if(e.getSource()==bmul) { a=Double.parseDouble(t.getText()); operator=3; t.setText(""); } if(e.getSource()==bdiv) { a=Double.parseDouble(t.getText()); operator=4; t.setText(""); } if(e.getSource()==beq) { b=Double.parseDouble(t.getText()); switch(operator) { case 1: result=a+b; break; case 2: result=a-b; break; case 3: result=a*b; break; case 4: result=a/b; break; default: result=0; } t.setText(""+result); } if(e.getSource()==bclr) t.setText(""); if(e.getSource()==bdel) { String s=t.getText(); t.setText(""); for(int i=0;i<s.length()-1;i++) t.setText(t.getText()+s.charAt(i)); } } public static void main(String...s) { new Calc(); } } |
In the above code I am creating objects of the class JButton and JTextField in order to use them in the GUI of the program later I am implementing actionlistener interface in order to get the input of the actions of the users.
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