ascpn

01import java.awt.*;

002import javax.swing.*;

003import java.awt.event.*;

004 

005public class Calculator extends JFrame implements ActionListener {

006     

007    JPanel[] row = new JPanel[5];

008    JButton[] button = new JButton[19];

009    String[] buttonString = {"7", "8", "9", "+",

010                             "4", "5", "6", "-",

011                             "1", "2", "3", "*",

012                             ".", "/", "C", "√",

013                             "+/-", "=", "0"};

014    int[] dimW = {300,45,100,90};

015    int[] dimH = {35, 40};

016    Dimension displayDimension = new Dimension(dimW[0], dimH[0]);

017    Dimension regularDimension = new Dimension(dimW[1], dimH[1]);

018    Dimension rColumnDimension = new Dimension(dimW[2], dimH[1]);

019    Dimension zeroButDimension = new Dimension(dimW[3], dimH[1]);

020    boolean[] function = new boolean[4];

021    double[] temporary = {0, 0};

022    JTextArea display = new JTextArea(1,20);

023    Font font = new Font("Times new Roman", Font.BOLD, 14);

024     

025    Calculator() {

026        super("Calculator");

027        setDesign();

028        setSize(380, 250);

029        setResizable(false);

030        setDefaultCloseOperation(EXIT_ON_CLOSE);

031        GridLayout grid = new GridLayout(5,5);

032        setLayout(grid);

033         

034        for(int i = 0; i < 4; i++)

035            function[i] = false;

036         

037        FlowLayout f1 = new FlowLayout(FlowLayout.CENTER);

038        FlowLayout f2 = new FlowLayout(FlowLayout.CENTER,1,1);

039        for(int i = 0; i < 5; i++)

040            row[i] = new JPanel();

041        row[0].setLayout(f1);

042        for(int i = 1; i < 5; i++)

043            row[i].setLayout(f2);

044         

045        for(int i = 0; i < 19; i++) {

046            button[i] = new JButton();

047            button[i].setText(buttonString[i]);

048            button[i].setFont(font);

049            button[i].addActionListener(this);

050        }

051         

052        display.setFont(font);

053        display.setEditable(false);

054        display.setComponentOrientation(ComponentOrientation.RIGHT_TO_LEFT);

055        display.setPreferredSize(displayDimension);

056        for(int i = 0; i < 14; i++)

057            button[i].setPreferredSize(regularDimension);

058        for(int i = 14; i < 18; i++)

059            button[i].setPreferredSize(rColumnDimension);

060        button[18].setPreferredSize(zeroButDimension);

061         

062        row[0].add(display);

063        add(row[0]);

064         

065        for(int i = 0; i < 4; i++)

066            row[1].add(button[i]);

067        row[1].add(button[14]);

068        add(row[1]);

069         

070        for(int i = 4; i < 8; i++)

071            row[2].add(button[i]);

072        row[2].add(button[15]);

073        add(row[2]);

074         

075        for(int i = 8; i < 12; i++)

076            row[3].add(button[i]);

077        row[3].add(button[16]);

078        add(row[3]);

079         

080        row[4].add(button[18]);

081        for(int i = 12; i < 14; i++)

082            row[4].add(button[i]);

083        row[4].add(button[17]);

084        add(row[4]);

085         

086        setVisible(true);

087    }

088     

089    public void clear() {

090        try {

091            display.setText("");

092            for(int i = 0; i < 4; i++)

093                function[i] = false;

094            for(int i = 0; i < 2; i++)

095                temporary[i] = 0;

096        } catch(NullPointerException e) {  

097        }

098    }

099     

100    public void getSqrt() {

101        try {

102            double value = Math.sqrt(Double.parseDouble(display.getText()));

103            display.setText(Double.toString(value));

104        } catch(NumberFormatException e) {

105        }

106    }

107     

108    public void getPosNeg() {

109        try {

110            double value = Double.parseDouble(display.getText());

111            if(value != 0) {

112                value = value * (-1);

113                display.setText(Double.toString(value));

114            }

115            else {

116            }

117        } catch(NumberFormatException e) {

118        }

119    }

120     

121    public void getResult() {

122        double result = 0;

123        temporary[1] = Double.parseDouble(display.getText());

124        String temp0 = Double.toString(temporary[0]);

125        String temp1 = Double.toString(temporary[1]);

126        try {

127            if(temp0.contains("-")) {

128                String[] temp00 = temp0.split("-", 2);

129                temporary[0] = (Double.parseDouble(temp00[1]) * -1);

130            }

131            if(temp1.contains("-")) {

132                String[] temp11 = temp1.split("-", 2);

133                temporary[1] = (Double.parseDouble(temp11[1]) * -1);

134            }

135        } catch(ArrayIndexOutOfBoundsException e) {

136        }

137        try {

138            if(function[2] == true)

139                result = temporary[0] * temporary[1];

140            else if(function[3] == true)

141                result = temporary[0] / temporary[1];

142            else if(function[0] == true)

143                result = temporary[0] + temporary[1];

144            else if(function[1] == true)

145                result = temporary[0] - temporary[1];

146            display.setText(Double.toString(result));

147            for(int i = 0; i < 4; i++)

148                function[i] = false;

149        } catch(NumberFormatException e) {

150        }

151    }

152     

153    public final void setDesign() {

154        try {

155            UIManager.setLookAndFeel(

156                    "com.sun.java.swing.plaf.nimbus.NimbusLookAndFeel");

157        } catch(Exception e) {   

158        }

159    }

160     

161    @Override

162    public void actionPerformed(ActionEvent ae) {

163        if(ae.getSource() == button[0])

164            display.append("7");

165        if(ae.getSource() == button[1])

166            display.append("8");

167        if(ae.getSource() == button[2])

168            display.append("9");

169        if(ae.getSource() == button[3]) {

170            //add function[0]

171            temporary[0] = Double.parseDouble(display.getText());

172            function[0] = true;

173            display.setText("");

174        }

175        if(ae.getSource() == button[4])

176            display.append("4");

177        if(ae.getSource() == button[5])

178            display.append("5");

179        if(ae.getSource() == button[6])

180            display.append("6");

181        if(ae.getSource() == button[7]) {

182            //subtract function[1]

183            temporary[0] = Double.parseDouble(display.getText());

184            function[1] = true;

185            display.setText("");

186        }

187        if(ae.getSource() == button[8])

188            display.append("1");

189        if(ae.getSource() == button[9])

190            display.append("2");

191        if(ae.getSource() == button[10])

192            display.append("3");

193        if(ae.getSource() == button[11]) {

194            //multiply function[2]

195            temporary[0] = Double.parseDouble(display.getText());

196            function[2] = true;

197            display.setText("");

198        }

199        if(ae.getSource() == button[12])

200            display.append(".");

201        if(ae.getSource() == button[13]) {

202            //divide function[3]

203            temporary[0] = Double.parseDouble(display.getText());

204            function[3] = true;

205            display.setText("");

206        }

207        if(ae.getSource() == button[14])

208            clear();

209        if(ae.getSource() == button[15])

210            getSqrt();

211        if(ae.getSource() == button[16])

212            getPosNeg();

213        if(ae.getSource() == button[17])

214            getResult();

215        if(ae.getSource() == button[18])

216            display.append("0");

217    }

218     

219    public static void main(String[] arguments) {

220        Calculator c = new Calculator();

221    }

222}