import java.awt.*;
import java.awt.event.*;
import java.util.*;
import java.io.*;
import javax.swing.*;

public class Main extends JFrame implements KeyListener{
    static Main frm_Main;
    
    public Main(){
        super("Ejemplo: Cerrar Frame con Tecla Escape");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        
        addKeyListener(this);
        
        setSize(400,400);
        setLocationRelativeTo(null);
        setResizable(false);
        setVisible(true);
    }
    
    public static void main(String[] args) throws IOException{
        frm_Main = new Main();        
    }
    
    public void keyReleased(KeyEvent e){
        //Acá se lee que se esté llamando desde el Frame con la Tecla Escape
        if (e.getSource().equals(frm_Main) && e.getKeyCode() == 27){
            System.exit(0);
        }
    }
    
    public void keyPressed(KeyEvent e){
        
    }
    
    public void keyTyped(KeyEvent e){
        
    }
}