Simple Java GUI Calculator that performs basic mathematical calculations (addition, subtraction, multiplication and divide). In addition, it can calculate the sine, cosine, tangent, log, square and square root of numbers.
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/** *website: www.cscprogrammingtutorials.com */ import java.awt.BorderLayout; import java.awt.Color; import java.awt.FlowLayout; import java.awt.event.ActionListener; import java.awt.event.ActionEvent; import javax.swing.*; public class Calculator extends JFrame { JButton zero = new JButton(" 0 "); JButton one = new JButton(" 1 "); JButton two = new JButton(" 2 "); JButton three = new JButton(" 3 "); JButton four = new JButton(" 4 "); JButton five = new JButton(" 5 "); JButton six = new JButton(" 6 "); JButton seven = new JButton(" 7 "); JButton eight = new JButton(" 8 "); JButton nine = new JButton(" 9 "); JButton plus = new JButton(" + "); JButton minus = new JButton(" - "); JButton times = new JButton(" * "); JButton divide = new JButton(" / "); JButton square = new JButton(" ^2 "); JButton squareroot = new JButton(" 2/x "); JButton log = new JButton(" log "); JButton degrees = new JButton(" DEG "); JButton radians = new JButton(" RAD "); JButton pi = new JButton(" pi "); JButton equals = new JButton(" = "); JButton sin = new JButton(" sin "); JButton cos = new JButton(" cos "); JButton tan = new JButton(" tan "); JButton point = new JButton(" . "); JButton clear = new JButton(" Clear "); String value; char operator; JTextArea area = new JTextArea(3, 5); public static void main(String[] args) { Calculator calculator = new Calculator(); calculator.setSize(230, 340); calculator.setTitle(" Calculator "); calculator.setResizable(false); calculator.setVisible(true); calculator.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); } public Calculator() { add(new JScrollPane(area), BorderLayout.NORTH); JPanel buttonpanel = new JPanel(); buttonpanel.setLayout(new FlowLayout()); buttonpanel.add(degrees); buttonpanel.add(radians); buttonpanel.add(pi); buttonpanel.add(sin); buttonpanel.add(cos); buttonpanel.add(tan); buttonpanel.add(square); buttonpanel.add(log); buttonpanel.add(squareroot); buttonpanel.add(seven); buttonpanel.add(eight); buttonpanel.add(nine); buttonpanel.add(divide); buttonpanel.add(four); buttonpanel.add(five); buttonpanel.add(six); buttonpanel.add(times); buttonpanel.add(one); buttonpanel.add(two); buttonpanel.add(three); buttonpanel.add(minus); buttonpanel.add(zero); buttonpanel.add(point); buttonpanel.add(plus); buttonpanel.add(clear); buttonpanel.add(equals); add(buttonpanel, BorderLayout.CENTER); area.setForeground(Color.BLACK); area.setBackground(Color.WHITE); area.setLineWrap(true); area.setWrapStyleWord(true); area.setEditable(false); zero.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent f) { area.append("0".toString()); } }); one.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent f) { area.append("1".toString()); } }); two.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent f) { area.append("2".toString()); } }); three.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent f) { area.append("3".toString()); } }); four.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent f) { area.append("4".toString()); } }); five.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent f) { area.append("5".toString()); } }); six.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent f) { area.append("6".toString()); } }); seven.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent f) { area.append("7".toString()); } }); eight.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent f) { area.append("8".toString()); } }); nine.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent f) { area.append("9".toString()); } }); plus.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent f) { area.append("+".toString()); operator = '+'; } }); minus.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent f) { area.append("-".toString()); operator = '-'; } }); times.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent f) { area.append("*".toString()); operator = '*'; } }); divide.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent f) { area.append("/".toString()); operator = '/'; } }); square.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent f) { area.append("^2".toString()); } }); squareroot.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent f) { area.append("Squareroot".toString()); value = "Squareroot"; } }); log.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent f) { area.append("log".toString()); value = "log"; } }); degrees.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent f) { area.append("deg".toString()); value = "deg"; } }); radians.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent f) { area.append("rad".toString()); value = "rad"; } }); pi.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent f) { area.append("pi".toString()); value = "pi"; } }); equals.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent f) { String leftSide String rightSide; try { leftSide = area.getText().substring(0, area.getText().indexOf(operator + "")); rightSide = area.getText().substring(area.getText().indexOf(operator + "") + 1, area.getText().length()); switch (operator) { case '+': area.append(" = " + ((Double.parseDouble(leftSide) + Double.parseDouble(rightSide)))); break; case '-': area.append(" = " + ((Double.parseDouble(leftSide) - Double.parseDouble(rightSide)))); break; case '/': area.append(" = " + ((Double.parseDouble(leftSide) / Double.parseDouble(rightSide)))); break; case '*': area.append(" = " + ((Double.parseDouble(leftSide) * Double.parseDouble(rightSide)))); break; default: area.setText(" No Result... "); break; } } catch (Exception e) { } try { String sinValue; sinValue = area.getText().substring(area.getText().indexOf(value) + 1, area.getText().length()); area.append("=" + Math.sin((Double.parseDouble(sinValue)))); } catch (Exception e) { } String cosValue; try { cosValue = area.getText().substring(area.getText().indexOf("cos") + 1, area.getText().length()); area.append("=" + Math.cos((Double.parseDouble(cosValue)))); } catch (Exception e) { } String tanValue; try { tanValue = area.getText().substring(area.getText().indexOf("tan") + 1, area.getText().length()); area.append("=" + Math.tan((Double.parseDouble(tanValue)))); } catch (Exception e) { } } }); sin.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent f) { value = "sin"; } }); cos.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent f) { area.append("cos".toString()); } }); tan.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent f) { area.append("tan".toString()); } }); point.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent f) { area.append(".".toString()); } }); clear.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent f) { area.setText(""); } }); } } |
Below is a screenshot of the output when the program is run.
1 Comment
This program is working and its very simple thanks for sharing this Calculator program code. It help me a lot in my college exams.