JOptionPane.showInputDialog : Cannot Find Symbol

package graf02;

import javax.swing.*;

public class Main extends JApplet {

    public Main() { }

    public static void main(String[] args) {
        
        String key = "EstudanteJ";
        String _key;
        int x = 2;
        
        do {
            _key = JOptionPane.showInputDialog("Digite a senha.");
            if(key.equalsIgnoreCase(_key)){
                JOptionPane.showMessageDialog("A senha esta correta.");
                x = 1;
            }
            else{
                JOptionPane.sowMessageDialog("A senha esta incorreta tente outra vez.");
            }
       } while(x==2);
    }
}

init:

deps-jar:

Compiling 1 source file to C:\Curso\graf02\build\classes

C:\Curso\graf02\src\graf02\Main.java:23: cannot resolve symbol

symbol  : method showMessageDialog (java.lang.String)

location: class javax.swing.JOptionPane

                JOptionPane.showMessageDialog("A senha esta correta.");

C:\Curso\graf02\src\graf02\Main.java:27: cannot resolve symbol

symbol  : method sowMessageDialog (java.lang.String)

location: class javax.swing.JOptionPane

                JOptionPane.sowMessageDialog("A senha esta incorreta tente outra vez.");

2 errors

BUILD FAILED (total time: 0 seconds)