Java - pasar arraylist de una clase a un jlist de otra

   
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pasar arraylist de una clase a un jlist de otra

Publicado por Charly cdum77@hotmail.com (56 intervenciones) el 20/08/2016 20:22:43
Hola, estoy realizando una aplicación de profesores y alumnos.
El problema es que, después de meter alumnos en un formulario y guardarlo en un arraylist, al abrir el formulario de borrar alumnos no me sale el contenido de ese arraylist en el jlist del segundo formulario.
Paso el codigo del archivo java para que lo puedan ver:
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/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates and open the template in the editor.
 */
package examen;
import java.util.ArrayList;
import javax.swing.DefaultListModel;
/*
 * @author Charly
 */
public class BorrarAlumnos extends javax.swing.JDialog{
    private ArrayList<Alumno> arrAlum=new ArrayList();
    private ArrayList<Alumno> arrAlumElim=new ArrayList();
    DefaultListModel alumnos;
    /*
     * Creates new form BorrarAlumnos
     */
    public BorrarAlumnos(java.awt.Frame parent,boolean modal){
        super(parent,modal);
        initComponents();
        this.alumnos=alumnos;
        alumnos=new DefaultListModel();
    }
    public void pasarArrayAlum(ArrayList<Alumno> arr){
        arrAlum=arr;
        ListaAlumnos.setModel(alumnos);
        mostrarListaAlum();
    }
    public void mostrarListaAlum(){
        alumnos.clear();
        for(Alumno a:arrAlum){
            alumnos.addElement(a.getNombreApellidos());
        }
    }
    /*
     * 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() {
 
        jLabel1 = new javax.swing.JLabel();
        jScrollPane1 = new javax.swing.JScrollPane();
        ListaAlumnos = new javax.swing.JList();
        botonBorrar = new javax.swing.JButton();
        botonCerrar = new javax.swing.JButton();
 
        setDefaultCloseOperation(javax.swing.WindowConstants.DISPOSE_ON_CLOSE);
 
        jLabel1.setText("Alumnos");
 
        jScrollPane1.setViewportView(ListaAlumnos);
 
        botonBorrar.setText("Borrar");
        botonBorrar.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                botonBorrarActionPerformed(evt);
            }
        });
 
        botonCerrar.setText("Cerrar");
        botonCerrar.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                botonCerrarActionPerformed(evt);
            }
        });
 
        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(layout.createSequentialGroup()
                        .addComponent(jLabel1)
                        .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
                    .addGroup(layout.createSequentialGroup()
                        .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 319, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 59, Short.MAX_VALUE)
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                            .addComponent(botonBorrar, javax.swing.GroupLayout.Alignment.TRAILING)
                            .addComponent(botonCerrar, javax.swing.GroupLayout.Alignment.TRAILING))
                        .addGap(51, 51, 51))))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addComponent(jLabel1)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(layout.createSequentialGroup()
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addComponent(jScrollPane1, javax.swing.GroupLayout.DEFAULT_SIZE, 255, Short.MAX_VALUE)
                        .addContainerGap())
                    .addGroup(layout.createSequentialGroup()
                        .addGap(37, 37, 37)
                        .addComponent(botonBorrar)
                        .addGap(41, 41, 41)
                        .addComponent(botonCerrar)
                        .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))))
        );
 
        pack();
    }// </editor-fold>                        
 
    private void botonBorrarActionPerformed(java.awt.event.ActionEvent evt) {
        //pasarArrayAlum(arrAlum);
        //mostrarListaAlum();
        //ListaAlumnos.setModel(alumnos);
        int index=ListaAlumnos.getSelectedIndex();
        Alumno alum=arrAlum.get(index);
        arrAlumElim.add(alum);
        arrAlum.remove(alum);
    }
 
    private void botonCerrarActionPerformed(java.awt.event.ActionEvent evt) {
        this.dispose();
    }
 
    /**
     * @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(BorrarAlumnos.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(BorrarAlumnos.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(BorrarAlumnos.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(BorrarAlumnos.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
        //</editor-fold>
 
        /* Create and display the dialog */
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                BorrarAlumnos dialog = new BorrarAlumnos(new javax.swing.JFrame(), true);
                dialog.addWindowListener(new java.awt.event.WindowAdapter() {
                    @Override
                    public void windowClosing(java.awt.event.WindowEvent e) {
                        System.exit(0);
                    }
                });
                dialog.setVisible(true);
            }
        });
    }
 
    // Variables declaration - do not modify                     
    private javax.swing.JList ListaAlumnos;
    private javax.swing.JButton botonBorrar;
    private javax.swing.JButton botonCerrar;
    private javax.swing.JLabel jLabel1;
    private javax.swing.JScrollPane jScrollPane1;
    // End of variables declaration                   
}
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