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import java.awt.event.ActionEvent;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.KeyStroke;
import javax.swing.text.Document;
import javax.swing.text.JTextComponent;
import javax.swing.text.TextAction;
public class Main {
public static void main(String[] argv) throws Exception {
JTextArea comp = new JTextArea();
String actionName = "Lowercase";
JFrame f = new JFrame();
f.add(new JScrollPane(comp));
f.setSize(300,300);
f.setVisible(true);
comp.getInputMap().put(KeyStroke.getKeyStroke("F2"), actionName);
comp.getActionMap().put(actionName, new TextAction(actionName) {
public void actionPerformed(ActionEvent evt) {
JTextComponent comp = getTextComponent(evt);
if (comp.getSelectionStart() == comp.getSelectionEnd()) {
if (comp.getCaretPosition() < comp.getDocument().getLength()) {
try {
int pos = comp.getCaretPosition();
Document doc = comp.getDocument();
String str = doc.getText(pos, 1).toLowerCase();
doc.remove(pos, 1);
doc.insertString(pos, str, null);
comp.moveCaretPosition(pos + 1);
} catch (Exception e) {
System.out.println();
}
}
} else {
int s = comp.getSelectionStart();
int e = comp.getSelectionEnd();
comp.replaceSelection(comp.getSelectedText().toLowerCase());
comp.select(s, e);
}
}
});
}
}
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