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Press shift space or shift F2 to move the focus to the previous focusable component

import java.awt.Component; import java.awt.event.ActionEvent; import javax.swing.AbstractAction; import javax.swing.Action; import javax.swing.JButton; import javax.swing.JComponent; import javax.swing.KeyStroke; public class Main {   public static void main(String[] argv) {     JButton component = new JButton();     PrevFocusAction prevFocusAction = new PrevFocusAction();     component.getInputMap(JComponent.WHEN_FOCUSED).put(KeyStroke.getKeyStroke("shift F2"),         prevFocusAction.getValue(Action.NAME));     component.getInputMap(JComponent.WHEN_FOCUSED).put(KeyStroke.getKeyStroke("shift SPACE"),         prevFocusAction.getValue(Action.NAME));     component.getActionMap().put(prevFocusAction.getValue(Action.NAME), prevFocusAction);   } } class PrevFocusAction extends AbstractAction {   PrevFocusAction() {     super("Move Focus Backwards");   }   public void actionPerformed(ActionEvent evt) {     ((Component) evt.getSource()).transferFocusBackward();   } }