Disable a character so that no action is invoked.

    

import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JTextField;
import javax.swing.KeyStroke;

public class Main {
  public static void main(String[] argv) {
    JTextField component = new JTextField(10);

    
    component.getInputMap(JComponent.WHEN_FOCUSED).put(
        KeyStroke.getKeyStroke("typed X"), "none");


    JFrame f = new JFrame();
    f.add(component);

    f.setSize(300, 300);

    f.setVisible(true);

  }
}

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Disable a character so that no action is invoked. : Document Event « Swing JFC « Java

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