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<p>1 версия</p> <table class="diff diff-contentalign-left" data-mw="interface"> <tr style="vertical-align: top;" lang="ru"> <td colspan="1" style="background-color: white; color:black; text-align: center;">← Предыдущая</td> <td colspan="1" style="background-color: white; color:black; text-align: center;">Версия 07:19, 1 июня 2010</td> </tr><tr><td colspan="2" style="text-align: center;" lang="ru"><div class="mw-diff-empty">(нет различий)</div> </td></tr></table>

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<p></p> <p><b>Новая страница</b></p><div>== A calculator ==<br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> &lt;!-- start source code --&gt;<br /> <br /> &lt;source lang=&quot;java&quot;&gt;<br /> import java.awt.BorderLayout;<br /> import java.awt.Container;<br /> import java.awt.GridLayout;<br /> import java.awt.event.ActionEvent;<br /> import java.awt.event.ActionListener;<br /> import java.awt.event.WindowAdapter;<br /> import java.awt.event.WindowEvent;<br /> import javax.swing.JButton;<br /> import javax.swing.JFrame;<br /> import javax.swing.JPanel;<br /> import javax.swing.JTextField;<br /> public class Calculator extends JPanel implements ActionListener {<br /> private JTextField display = new JTextField(&quot;0&quot;);<br /> private String buttonText = &quot;789/456*123-0.=+&quot;;<br /> private double result = 0;<br /> private String operator = &quot;=&quot;;<br /> private boolean calculating = true;<br /> public Calculator() {<br /> setLayout(new BorderLayout());<br /> display.setEditable(false);<br /> add(display, &quot;North&quot;);<br /> JPanel p = new JPanel();<br /> p.setLayout(new GridLayout(4, 4));<br /> for (int i = 0; i &lt; buttonText.length(); i++) {<br /> JButton b = new JButton(buttonText.substring(i, i + 1));<br /> p.add(b);<br /> b.addActionListener(this);<br /> }<br /> add(p, &quot;Center&quot;);<br /> }<br /> public void actionPerformed(ActionEvent evt) {<br /> String cmd = evt.getActionCommand();<br /> if (&quot;0&quot; &lt;= cmd.charAt(0) &amp;&amp; cmd.charAt(0) &lt;= &quot;9&quot; || cmd.equals(&quot;.&quot;)) {<br /> if (calculating)<br /> display.setText(cmd);<br /> else<br /> display.setText(display.getText() + cmd);<br /> calculating = false;<br /> } else {<br /> if (calculating) {<br /> if (cmd.equals(&quot;-&quot;)) {<br /> display.setText(cmd);<br /> calculating = false;<br /> } else<br /> operator = cmd;<br /> } else {<br /> double x = Double.parseDouble(display.getText());<br /> calculate(x);<br /> operator = cmd;<br /> calculating = true;<br /> }<br /> }<br /> }<br /> private void calculate(double n) {<br /> if (operator.equals(&quot;+&quot;))<br /> result += n;<br /> else if (operator.equals(&quot;-&quot;))<br /> result -= n;<br /> else if (operator.equals(&quot;*&quot;))<br /> result *= n;<br /> else if (operator.equals(&quot;/&quot;))<br /> result /= n;<br /> else if (operator.equals(&quot;=&quot;))<br /> result = n;<br /> display.setText(&quot;&quot; + result);<br /> }<br /> public static void main(String[] args) {<br /> JFrame frame = new JFrame();<br /> frame.setTitle(&quot;Calculator&quot;);<br /> frame.setSize(200, 200);<br /> frame.addWindowListener(new WindowAdapter() {<br /> public void windowClosing(WindowEvent e) {<br /> System.exit(0);<br /> }<br /> });<br /> Container contentPane = frame.getContentPane();<br /> contentPane.add(new Calculator());<br /> frame.show();<br /> }<br /> }<br /> <br /> &lt;/source&gt;<br /> <br /> <br /> &lt;!-- end source code --&gt;</div>