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NetBeans não carrega janela JFrame


Michael Scofield
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Bom dia!

Estou desenvolvendo uma aplicação e empaquei na hora de mostrar a janela JFrame principal do programa. Eu construo e executo, mas não é mostrada a janela; apenas surge a mensagem "CONSTRUÍDO COM SUCESSO (tempo total: 0 segundos)" no console.

O código de inicialização é:

    public static void main(String args[]) {   
       java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new Principal().setVisible(true);
            }
       });
    }

Alguém poderia me ajudar?

Obrigado!

tela.JPG

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