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JComponent setFocusTraversalKeys(int arg0, Set extends AWTKeyStroke arg1)

import java.awt.AWTKeyStroke; import java.awt.KeyboardFocusManager; import java.util.HashSet; import java.util.Set; import javax.swing.JButton; import javax.swing.KeyStroke; public class Main {   public static void main(String[] argv) throws Exception {     JButton component = new JButton("a");     Set<AWTKeyStroke> set = new HashSet<AWTKeyStroke>(component         .getFocusTraversalKeys(KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS));     set.add(KeyStroke.getKeyStroke("F2"));     component.setFocusTraversalKeys(KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS, set);   } }