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    <p>As @andrew-thompson pointed out, the issue was <a href="http://www.oracle.com/technetwork/articles/java/mixing-components-433992.html" rel="nofollow">mix of awt and swing</a>. I suppose somehow the GComponent was overlaying Swing component JTextField which made it inaccessible. So the workaround is to create JPanel and a KeyListener to the JTextField as noted by @marco . This is the code that works : <strong>SSCCE Code</strong></p> <pre><code> /** * * This program prints the given text in the font inputted by the user in JTextField */ import java.awt.BorderLayout; import java.awt.event.KeyEvent; import java.awt.event.KeyListener; import javax.swing.JPanel; import javax.swing.JTextField; import acm.graphics.GLabel; import acm.program.GraphicsProgram; public class FontSampler extends GraphicsProgram implements KeyListener{ private static final String TEST_STRING = "This is a test"; private static final double LEFT_MARGIN = 3; private static final int MAX_FONT_NAME = 10; public void init(){ initPanel(); //init panel addJFontTextField(); //adds fontField to enter the font type addGLabel(); //adds default label to GCanvas lastY = 0; //default y offset for post-processed label add(panel); //adds panel to canvas } /** * initialises panel */ private void initPanel() { panel = new JPanel(); panel.setLayout(new BorderLayout()); } /** * Adds a text field to enter the required font */ private void addJFontTextField() { fontField = new JTextField( MAX_FONT_NAME);//added to see if Jtextfiled is responding panel.add(fontField, BorderLayout.SOUTH); fontField.addKeyListener(this); //adds key listener } /** * Adds the test label to canvas */ private void addGLabel() { lastLabel = new GLabel(TEST_STRING); add(lastLabel, 20, 20); } /** * Called when any key is pressed */ public void keyPressed(KeyEvent e){ if(e.getKeyCode() == KeyEvent.VK_ENTER){//check for enter key pressed GLabel label = new GLabel(TEST_STRING); label.setFont(lastLabel.getFont()); label.setFont(fontField.getText()); addGlabel(label); lastLabel = label; } } /** *adds a Glabel on the next line adjusting for heights * @param label */ private void addGlabel(GLabel label) { lastY += label.getHeight(); lastY += lastLabel.getDescent() - label.getDescent(); add(label, LEFT_MARGIN, lastY); } /** * JTextField to enter font */ private JTextField fontField; /** * GLabel which is being worked on */ private GLabel lastLabel; /** * */ private double lastY; private JPanel panel; } </code></pre> <p>Thanks :)</p>
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    1. POUnable to type or delete text in JTextfield
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    1. USAkash Kumar Sharma
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    1. COAn [sscce](http://sscce.org/) should be complete and self-contained.
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    2. CODon't use a KeyListener. Add an ActionListener to the text field.
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    3. CO@camickr Neither. Use a DocumentListener. ActionListener only triggers in a JTextField when the user presses Enter.
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