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POHow Do I Get User Input from a TextField and Convert it to a Double?
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  1. POHow Do I Get User Input from a TextField and Convert it to a Double?
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    copied!<p>I'm using Eclipse to build a calculator and I am having trouble because I need to have 2 values entered by the user. Here is my code for the run class.</p> <pre><code>import display.Gui; public class Main { public static void main(String argsp[]) { Gui window = new Gui(); double a = 0, b = 0, c = 0; String operator; boolean calculate = true; window.setVisible(true); window.setSize(500, 400); window.setResizable(false); window.setLocationRelativeTo(null); while (calculate) { window.textArea_1.append("Enter an equation.\n"); a = Double.parseDouble(window.textField.getText()); operator = window.textField.getText(); b = Double.parseDouble(window.textField.getText()); if (operator.contains("+")) c = a + b; if (operator.contains("-")) c = a - b; if (operator.contains("*")) c = a * b; if (operator.contains("/")) c = a / b; if (operator.contains("x^2")) c = a * a; if (operator.contains("sqrt")) c = Math.sqrt(a); if (operator.contains("%")) c = a / 100; window.textArea.append("" + c + "\n"); window.textArea.append(""); window.textArea.append("Would you like to make another calculation? [Yes/No]\n"); String calculation = window.textField.getText(); try { if (calculation.equalsIgnoreCase("Yes")) calculate = true; if (calculation.equalsIgnoreCase("No")) calculate = false; } catch (Exception e) { window.textArea_1.append("Please enter yes or no"); } } } } </code></pre> <p>and here is my class for the JFrame:</p> <pre><code>import java.awt.Dimension; import java.awt.EventQueue; import javax.swing.JFrame; import java.awt.BorderLayout; import javax.swing.JTextField; import javax.swing.JTextArea; import java.awt.event.ActionListener; import java.awt.event.ActionEvent; public class Gui extends JFrame { public JTextArea textArea, textArea_1; public JTextField textField; /** * Launch the application. */ public static void main(String[] args) { EventQueue.invokeLater(new Runnable() { public void run() { try { Gui frame = new Gui(); frame.setVisible(false); } catch (Exception e) { e.printStackTrace(); } } }); } /** * Create the frame. */ public Gui() { setBounds(100, 100, 450, 300); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); getContentPane().setLayout(new BorderLayout(0, 0)); textField = new JTextField(); textField.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent Ev) { textArea.append(textField.getText() + "\n"); textField.setText(""); } }); textField.requestFocus(); getContentPane().add(textField, BorderLayout.SOUTH); textField.setColumns(10); textArea = new JTextArea(); textArea.setEditable(false); textArea.setPreferredSize(new Dimension(215, 200)); getContentPane().add(textArea, BorderLayout.WEST); textArea_1 = new JTextArea(); textArea_1.setEditable(false); textArea_1.setPreferredSize(new Dimension(215, 200)); getContentPane().add(textArea_1, BorderLayout.EAST); } </code></pre> <p>i tried using <code>Double.parseDouble(window.textField.getText());</code></p> <p>but that didn't work. How can I make it work? Thanks in advance.</p>
 

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