Prevent the space from being inserted when shift-space is pressed.

    
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(new Character(' '), 0), "none");

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

    f.setSize(300, 300);

    f.setVisible(true);

  }
}

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Prevent the space from being inserted when shift-space is pressed. : Document Event « Swing JFC « Java

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