java GUI

package humanLanguage;

import javax.swing.*;

public class Et {

public static void main(String[] args) {

JFrame jf = new JFrame();

jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

jf.setVisible(turn);

}

}

Link all references for a local rename (does not change 

 references in other files)

最后面turn老是说不对q求解