How do I receive input from a textbox in a JFrame?

问题:

The following method extends a JFrame, but I need a swing textbox inside it to receive double values and store them in a variable. the textbox must be added to the container.

    public class myClass extends JFrame{
        Container container;
        container = getContentPane();

        //Item label
        JLabel labelText = new JLabel();        
       ...
        labelText.setText ("Item:");        
        container.add( labelText );

        //Item name: Textbox
        //code to make a textbox, add it to the container, and store the value in a                      variable goes here

回答1:

Use a JTextField:

 JTextField field = new JTextField(10);
 container.add(field, BorderLayout.SOUTH);

To get the value of the field, do Double.parseDouble(field.getText()).