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[DotNetDeveloper]

Te falta agregarlos al Applet y establecerle el tipo de Frame o no se como se llame=D

Código:

//<applet code="Cadenas.class" width="400" height="400"></applet>
import java.applet.Applet;
import java.awt.*;

public class Cadenas extends Applet //implements ActionListener
{
    private TextField str1, str2, rest, union;
    private Label lbl1, lbl2;
    private Button Compara;
    private Panel board;
    
    public void init()
    {
        lbl1 = new Label("Cadena 1: ");
        lbl2 = new Label("Cadena 2: ");
        str1 = new TextField(10);
        str2 = new TextField(10);
        rest = new TextField(10);
        union = new TextField(20);
        Compara = new Button("Procesar");
        
        board = new Panel();
        board.setLayout(new GridLayout(5,2,6,6));
        setLayout( new BorderLayout());
        add("Center", board);
        
        board.add(lbl1);
        board.add(str1);
        board.add(lbl2);
        board.add(str2);
        board.add(Compara);
    }
    
    public void paint() {
    	setVisible(true);	
    }
}