To add a text field for display or input one line of text (in this case, 30 characters wide):
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TextField tf = new TextField("initial text", 30);
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add(tf);
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The text which is displayed can be changed:
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tf.setText("now show a new text");
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If the user types input into the text field, it can be obtained:
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stringvar = tf.getText();
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Or you can disallow the user to type:
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The TextArea class also has these methods, but it can display multiple lines.
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When the user types in text and presses "return" or "enter", an ActionEvent is generated, so, similarly to Buttons, an ActionListener must be provided.
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