Jogo do Bicho JFrame

import javax.swing.JOptionPane;

public class JFrameFruta extends javax.swing.JFrame {

    /**
     * Creates new form JFrameFruta
     */
    public JFrameFruta() {
        initComponents();
    }

    /**
     * This method is called from within the constructor to initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is always
     * regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">
    private void initComponents() {

        jPanel1 = new javax.swing.JPanel();
        Icon1 = new javax.swing.JLabel();
        Icon2 = new javax.swing.JLabel();
        Icon3 = new javax.swing.JLabel();
        btnSortear = new javax.swing.JButton();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        Icon1.setFont(new java.awt.Font("Tahoma", 0, 18)); // NOI18N
        Icon1.setIcon(new javax.swing.ImageIcon(getClass().getResource("/1.jpg"))); // NOI18N

        Icon2.setFont(new java.awt.Font("Tahoma", 0, 18)); // NOI18N
        Icon2.setIcon(new javax.swing.ImageIcon(getClass().getResource("/2.jpg"))); // NOI18N

        Icon3.setFont(new java.awt.Font("Tahoma", 0, 18)); // NOI18N
        Icon3.setIcon(new javax.swing.ImageIcon(getClass().getResource("/3.jpg"))); // NOI18N

        btnSortear.setText("Sortear");
        btnSortear.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                btnSortearActionPerformed(evt);
            }
        });

        javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
        jPanel1.setLayout(jPanel1Layout);
        jPanel1Layout.setHorizontalGroup(
            jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel1Layout.createSequentialGroup()
                .addGap(42, 42, 42)
                .addComponent(Icon1)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 75, Short.MAX_VALUE)
                .addComponent(Icon2)
                .addGap(62, 62, 62)
                .addComponent(Icon3)
                .addGap(42, 42, 42))
            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel1Layout.createSequentialGroup()
                .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                .addComponent(btnSortear, javax.swing.GroupLayout.PREFERRED_SIZE, 81, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addGap(151, 151, 151))
        );
        jPanel1Layout.setVerticalGroup(
            jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jPanel1Layout.createSequentialGroup()
                .addGap(86, 86, 86)
                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(Icon1)
                    .addComponent(Icon2)
                    .addComponent(Icon3))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 82, Short.MAX_VALUE)
                .addComponent(btnSortear, javax.swing.GroupLayout.PREFERRED_SIZE, 39, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addGap(33, 33, 33))
        );

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
        );

        pack();
    }// </editor-fold>

    private void btnSortearActionPerformed(java.awt.event.ActionEvent evt) {

        int R1 = (int)(Math.round(Math.random()*2)+1);
        int R2 = (int)(Math.round(Math.random()*2)+1);
        int R3 = (int)(Math.round(Math.random()*2)+1);

        Icon1.setIcon(new javax.swing.ImageIcon(getClass().getResource("/"+R1+".jpg")));
        Icon2.setIcon(new javax.swing.ImageIcon(getClass().getResource("/"+R2+".jpg")));
        Icon3.setIcon(new javax.swing.ImageIcon(getClass().getResource("/"+R3+".jpg")));

        if(R1 == R2 && R2 == R3){
            JOptionPane.showMessageDialog(null, "Parabéns, você ganhou");
        }

        else{
            JOptionPane.showMessageDialog(null, "Você perdeu, trouxa.");
        }




        // TODO add your handling code here:
    }

    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {
        /* Set the Nimbus look and feel */
        //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
        /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
         * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
         */
        try {
            for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
                if ("Nimbus".equals(info.getName())) {
                    javax.swing.UIManager.setLookAndFeel(info.getClassName());
                    break;
                }
            }
        } catch (ClassNotFoundException ex) {
            java.util.logging.Logger.getLogger(JFrameFruta.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(JFrameFruta.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(JFrameFruta.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(JFrameFruta.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
        //</editor-fold>

        /* Create and display the form */
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new JFrameFruta().setVisible(true);
            }
        });
    }

    // Variables declaration - do not modify
    private javax.swing.JLabel Icon1;
    private javax.swing.JLabel Icon2;
    private javax.swing.JLabel Icon3;
    private javax.swing.JButton btnSortear;
    private javax.swing.JPanel jPanel1;
    // End of variables declaration
}