Java Swing Example
Fibonacci Generation
JList - JOptionPane
NetBeans - Internet & Web Programming Lab
Source code:
import javax.swing.DefaultListModel; import javax.swing.JOptionPane; /* * Fib2.java * * Created on Jan 21, 2012, 11:00:27 AM */ /** * * @author nn */ public class Fib2 extends javax.swing.JFrame { DefaultListModel dl; /** Creates new form Fib2 */ public Fib2() { super("Fibonacci Series Generation"); initComponents(); dl = new DefaultListModel(); jList1.setModel(dl); } /** 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() { jButton1 = new javax.swing.JButton(); jLabel1 = new javax.swing.JLabel(); jTextField1 = new javax.swing.JTextField(); jLabel2 = new javax.swing.JLabel(); jScrollPane1 = new javax.swing.JScrollPane(); jList1 = new javax.swing.JList(); setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE); jButton1.setText("Generate"); jButton1.addActionListener(new java.awt.event.ActionListener() { public void actionPerformed(java.awt.event.ActionEvent evt) { jButton1ActionPerformed(evt); } }); jLabel1.setText("Number of Terms"); jLabel2.setText("Fibonacci Numbers"); jList1.setModel(new javax.swing.AbstractListModel() { String[] strings = { "Item 1", "Item 2", "Item 3", "Item 4", "Item 5" }; public int getSize() { return strings.length; } public Object getElementAt(int i) { return strings[i]; } }); jScrollPane1.setViewportView(jList1); javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane()); getContentPane().setLayout(layout); layout.setHorizontalGroup( layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(layout.createSequentialGroup() .addGap(44, 44, 44) .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addComponent(jLabel1) .addGroup(layout.createSequentialGroup() .addGap(10, 10, 10) .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false) .addComponent(jButton1, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE) .addComponent(jTextField1, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.DEFAULT_SIZE, 80, Short.MAX_VALUE)))) .addGap(92, 92, 92) .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addComponent(jLabel2) .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 131, javax.swing.GroupLayout.PREFERRED_SIZE)) .addGap(45, 45, 45)) ); layout.setVerticalGroup( layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(layout.createSequentialGroup() .addContainerGap() .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(layout.createSequentialGroup() .addComponent(jLabel2) .addGap(16, 16, 16) .addComponent(jScrollPane1, javax.swing.GroupLayout.DEFAULT_SIZE, 221, Short.MAX_VALUE) .addGap(27, 27, 27)) .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup() .addComponent(jLabel1) .addGap(3, 3, 3) .addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE) .addGap(30, 30, 30) .addComponent(jButton1, javax.swing.GroupLayout.PREFERRED_SIZE, 40, javax.swing.GroupLayout.PREFERRED_SIZE) .addGap(69, 69, 69)))) ); pack(); }// </editor-fold> private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) { // TODO add your handling code here: if(jTextField1.getText()!= null) { dl.removeAllElements(); int n=Integer.parseInt(jTextField1.getText()); int ch = JOptionPane.showConfirmDialog(rootPane, "Generate "+n+ " fibonacci numbers ?"); //System.out.print(ch); //String n1 = JOptionPane.showInputDialog("Enter n:"); if(ch==0) genfib(n); } } void genfib(int n) { int t1=0,t2=1,t3; if(n>=1) { dl.addElement(t1); } if(n>=2) { dl.addElement(t2); } if(n>2) { for(int i=2;i<n;i++) { t3=t1+t2; dl.addElement(t3); t1=t2; t2=t3; //System.out.print(t3); } } } /** * @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(Fib2.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } catch (InstantiationException ex) { java.util.logging.Logger.getLogger(Fib2.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } catch (IllegalAccessException ex) { java.util.logging.Logger.getLogger(Fib2.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } catch (javax.swing.UnsupportedLookAndFeelException ex) { java.util.logging.Logger.getLogger(Fib2.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } //</editor-fold> /* Create and display the form */ java.awt.EventQueue.invokeLater(new Runnable() { @Override public void run() { Fib2 f1 = new Fib2(); f1.setVisible(true); f1.setSize(600,500); } }); } // Variables declaration - do not modify private javax.swing.JButton jButton1; private javax.swing.JLabel jLabel1; private javax.swing.JLabel jLabel2; private javax.swing.JList jList1; private javax.swing.JScrollPane jScrollPane1; private javax.swing.JTextField jTextField1; // End of variables declaration }
Output:
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