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

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The following method provides a JFrame, but I need a swing text box inside it to get double value and They can be stored in a variable. The text box should be added to the container 

  the public class expands myClass JFrame {container container; Container = getContentPane (); // item label JLabel label text = new jlabel (); ... label text Set text ("item:"); Container.ed (labeltext); // Item Name: Text Box // To create a text box, add it to the container and add value to a variable    
 
 
 Use a  JTextField :  
  JTextField field = new JTextField (10); Container.ed (field, border layout south);   
 To get the value of the field, repeat  .prsd double (field.gettext) ()) .

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