title: Exception in thread "AWT-EventQueue-0" java.lang.UnsupportedOperationException: Not supported yet
body: <p>I'm trying to input some details about student to the program. when i press the save button its giving an exception error like this,</p>
  
  <p>"Exception in thread "AWT-EventQueue-0" java.lang.UnsupportedOperationException: Not supported yet."</p>
  
  <hr>
  
  <pre><code>public static ArrayList&lt;Student&gt; arrayStudent = new ArrayList&lt;Student&gt;();
  
  public static void Student(Student student){
      try{
          BufferedWriter buffer = new BufferedWriter(new FileWriter("Students.txt", true));
  
          buffer.write("Name : "+student.getFirstName()+" "+student.getSurname()+"\nNIC No : "+student.getNICNo()+" "+"\nBatch Code : "+student.getBatchCode()+" "+"\nStudent No : "+student.getStudentNo()+" "+"\nTelephone No : "+student.getTelNo());
          buffer.newLine();
          buffer.close();
      }
      catch(IOException ex){
          Logger.getLogger(Arraylists.class.getName()).log(Level.SEVERE, null, ex);
  }
  
  
   public class addStudent extends JFrame {
  
  public addStudent() {
      initComponents();
      setTitle("Add Student");
      setBounds(0, 0, 410, 550);
      setIcon();
      getContentPane().setBackground(Color.BLACK);
      jTextField1.setText("");
      jTextField2.setText("");
      jTextField4.setText("");
      jTextField5.setText("");
      jTextField6.setText("");
      jTextField7.setText("");
  }
  
  public void addStudent(){
      Student newStudent= new Student();
  
      newStudent.setFirstName(jTextField1.getText());
      newStudent.setSurname(jTextField2.getText());
      newStudent.setNICNo(jTextField4.getText());
      newStudent.setBatchCode(jTextField5.getText());
      newStudent.setStudentNo(jTextField6.getText());
      newStudent.setTelNo(jTextField7.getText());
  }
  
  public boolean checkEmpty(){
      boolean checkEmpty = false;
      if(jTextField1.getText().isEmpty()||jTextField1.getText().isEmpty()||jTextField2.getText().isEmpty()||jTextField4.getText().isEmpty()||jTextField5.getText().isEmpty()||jTextField6.getText().isEmpty()||jTextField7.getText().isEmpty())
      {
          checkEmpty = true;
      }
      return checkEmpty;
  }                     
  
  private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                         
      Student newStudent = new Student();
  
      newStudent.setFirstName(jTextField1.getText());
      newStudent.setSurname(jTextField2.getText());
      newStudent.setNICNo(jTextField4.getText());
      newStudent.setBatchCode(jTextField5.getText());
      newStudent.setStudentNo(jTextField6.getText());
      newStudent.setTelNo(jTextField7.getText());
  
      if(checkEmpty()){
          JPanel msg = new JPanel();
          JOptionPane.showMessageDialog(msg, "Please Fill all the Fields!", "Error", JOptionPane.ERROR_MESSAGE);
      }
  
      else{
          addStudent();
          Arraylists.arrayStudent.add(newStudent);
  
          JPanel msg = new JPanel();
          JOptionPane.showMessageDialog(msg, "Student Added Successfully!", "Success", JOptionPane.INFORMATION_MESSAGE);
  
          newStudent = null;
          this.setVisible(false);
          addStudent studentAdded = new addStudent();
          studentAdded.setVisible(true);
      }
  
  } 
  </code></pre>
  
  <hr>
  
  <pre><code>public class Student {
  private String firstName;
  private String surName;
  private String NICNo;
  private String batchCode;
  private String studentNo;
  private String telephoneNo;
  
  public Student(String fName, String sName, String nicNo, String batCode, String studNo, String telNo){
      this.firstName = fName;
      this.surName = sName;
      this.NICNo = nicNo;
      this.batchCode = batCode;
      this.studentNo = studNo;
      this.telephoneNo = telNo;
  }
  
  public Student() {
      throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
  }
  
  public void setFirstName(String fName){
      this.firstName = fName;
  }
  
  public String getFirstName(){
      return firstName;
  }
  
  public void setSurname(String sName){
      this.surName = sName;
  }
  
  public String getSurname(){
      return surName;
  }
  
  public void setNICNo(String nicNo){
      this.NICNo = nicNo;
  }
  
  public String getNICNo(){
      return NICNo;
  }
  
  public void setBatchCode(String batCode){
      this.batchCode = batCode;
  }
  
  public String getBatchCode(){
      return batchCode;
  }
  
  public void setStudentNo(String studNo){
      this.studentNo = studNo;
  }
  
  public String getStudentNo(){
      return studentNo;
  }
  
  public void setTelNo(String telNo){
      this.telephoneNo = telNo;
  }
  
  public String getTelNo(){
      return telephoneNo;
  }
  </code></pre>
  
  <p>}</p>
  
  <hr>
  
  <pre><code> public class addStudent extends JFrame {
  
  public addStudent() {
      initComponents();
      setTitle("Add Student");
      setBounds(0, 0, 410, 550);
      setIcon();
      getContentPane().setBackground(Color.BLACK);
      jTextField1.setText("");
      jTextField2.setText("");
      jTextField4.setText("");
      jTextField5.setText("");
      jTextField6.setText("");
      jTextField7.setText("");
  }
  
  public void addStudent(){
      Student newStudent= new Student();
  
      newStudent.setFirstName(jTextField1.getText());
      newStudent.setSurname(jTextField2.getText());
      newStudent.setNICNo(jTextField4.getText());
      newStudent.setBatchCode(jTextField5.getText());
      newStudent.setStudentNo(jTextField6.getText());
      newStudent.setTelNo(jTextField7.getText());
  }
  
  public boolean checkEmpty(){
      boolean checkEmpty = false;
      if(jTextField1.getText().isEmpty()||jTextField1.getText().isEmpty()||jTextField2.getText().isEmpty()||jTextField4.getText().isEmpty()||jTextField5.getText().isEmpty()||jTextField6.getText().isEmpty()||jTextField7.getText().isEmpty())
      {
          checkEmpty = true;
      }
      return checkEmpty;
  }
  
  @SuppressWarnings("unchecked")
  // &lt;editor-fold defaultstate="collapsed" desc="Generated Code"&gt;                          
  private void initComponents() {
  
      jPanel1 = new javax.swing.JPanel();
      jPanel3 = new javax.swing.JPanel();
      jPanel2 = new javax.swing.JPanel();
      jLabel7 = new javax.swing.JLabel();
      jTextField1 = new javax.swing.JTextField();
      jTextField2 = new javax.swing.JTextField();
      jTextField4 = new javax.swing.JTextField();
      jTextField5 = new javax.swing.JTextField();
      jLabel1 = new javax.swing.JLabel();
      jTextField6 = new javax.swing.JTextField();
      jLabel2 = new javax.swing.JLabel();
      jTextField7 = new javax.swing.JTextField();
      jLabel3 = new javax.swing.JLabel();
      jComboBox1 = new javax.swing.JComboBox();
      jLabel4 = new javax.swing.JLabel();
      jButton1 = new javax.swing.JButton();
      jLabel5 = new javax.swing.JLabel();
      jButton2 = new javax.swing.JButton();
      jLabel6 = new javax.swing.JLabel();
      jLabel8 = new javax.swing.JLabel();
  
      setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
  
      jPanel1.setBackground(new java.awt.Color(0, 0, 0));
  
      jPanel3.setBackground(new java.awt.Color(0, 0, 0));
      jPanel3.setBorder(javax.swing.BorderFactory.createBevelBorder(javax.swing.border.BevelBorder.RAISED, java.awt.Color.white, java.awt.Color.white, java.awt.Color.white, java.awt.Color.white));
  
      jPanel2.setBackground(new java.awt.Color(0, 0, 0));
  
      jLabel7.setForeground(new java.awt.Color(255, 255, 255));
      jLabel7.setText("Tel. No :              +94");
  
      jTextField2.addActionListener(new java.awt.event.ActionListener() {
          public void actionPerformed(java.awt.event.ActionEvent evt) {
              jTextField2ActionPerformed(evt);
          }
      });
  
      jLabel1.setForeground(new java.awt.Color(255, 255, 255));
      jLabel1.setText("First Name :");
  
      jLabel2.setForeground(new java.awt.Color(255, 255, 255));
      jLabel2.setText("Surname :");
  
      jLabel3.setForeground(new java.awt.Color(255, 255, 255));
      jLabel3.setText("Sex :");
  
      jComboBox1.setModel(new javax.swing.DefaultComboBoxModel(new String[] { "Male", "Female" }));
      jComboBox1.addActionListener(new java.awt.event.ActionListener() {
          public void actionPerformed(java.awt.event.ActionEvent evt) {
              jComboBox1ActionPerformed(evt);
          }
      });
  
      jLabel4.setForeground(new java.awt.Color(255, 255, 255));
      jLabel4.setText("NIC No :");
  
      jButton1.setText("Save");
      jButton1.addActionListener(new java.awt.event.ActionListener() {
          public void actionPerformed(java.awt.event.ActionEvent evt) {
              jButton1ActionPerformed(evt);
          }
      });
  
      jLabel5.setForeground(new java.awt.Color(255, 255, 255));
      jLabel5.setText("Batch Code :         CF");
  
      jButton2.setText("Cancel");
      jButton2.addActionListener(new java.awt.event.ActionListener() {
          public void actionPerformed(java.awt.event.ActionEvent evt) {
              jButton2ActionPerformed(evt);
          }
      });
  
      jLabel6.setForeground(new java.awt.Color(255, 255, 255));
      jLabel6.setText("Student Number : CB");
  
      javax.swing.GroupLayout jPanel2Layout = new javax.swing.GroupLayout(jPanel2);
      jPanel2.setLayout(jPanel2Layout);
      jPanel2Layout.setHorizontalGroup(
          jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
          .addGroup(jPanel2Layout.createSequentialGroup()
              .addContainerGap()
              .addGroup(jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                  .addGroup(jPanel2Layout.createSequentialGroup()
                      .addGroup(jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                          .addComponent(jLabel1)
                          .addComponent(jLabel2)
                          .addComponent(jLabel3)
                          .addComponent(jLabel4))
                      .addGap(39, 39, 39)
                      .addGroup(jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
                          .addComponent(jTextField1, javax.swing.GroupLayout.Alignment.LEADING)
                          .addComponent(jComboBox1, 0, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                          .addComponent(jTextField4, javax.swing.GroupLayout.Alignment.LEADING)
                          .addComponent(jTextField2)))
                  .addGroup(jPanel2Layout.createSequentialGroup()
                      .addGroup(jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING, false)
                          .addComponent(jLabel5, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                          .addComponent(jLabel6, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                          .addComponent(jLabel7, javax.swing.GroupLayout.Alignment.LEADING))
                      .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                      .addGroup(jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                          .addGroup(jPanel2Layout.createSequentialGroup()
                              .addGap(0, 95, Short.MAX_VALUE)
                              .addComponent(jButton1)
                              .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                              .addComponent(jButton2))
                          .addComponent(jTextField6)
                          .addComponent(jTextField7)
                          .addComponent(jTextField5))))
              .addContainerGap())
      );
      jPanel2Layout.setVerticalGroup(
          jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
          .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel2Layout.createSequentialGroup()
              .addContainerGap(27, Short.MAX_VALUE)
              .addGroup(jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                  .addComponent(jLabel1)
                  .addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
              .addGap(18, 18, 18)
              .addGroup(jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                  .addComponent(jLabel2)
                  .addComponent(jTextField2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
              .addGap(18, 18, 18)
              .addGroup(jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                  .addComponent(jLabel3)
                  .addComponent(jComboBox1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
              .addGap(18, 18, 18)
              .addGroup(jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                  .addComponent(jLabel4)
                  .addComponent(jTextField4, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
              .addGap(18, 18, 18)
              .addGroup(jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                  .addComponent(jLabel5)
                  .addComponent(jTextField5, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
              .addGap(18, 18, 18)
              .addGroup(jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                  .addComponent(jLabel6)
                  .addComponent(jTextField6, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
              .addGap(18, 18, 18)
              .addGroup(jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                  .addComponent(jLabel7)
                  .addComponent(jTextField7, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
              .addGap(18, 18, 18)
              .addGroup(jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                  .addComponent(jButton1)
                  .addComponent(jButton2))
              .addContainerGap())
      );
  
      javax.swing.GroupLayout jPanel3Layout = new javax.swing.GroupLayout(jPanel3);
      jPanel3.setLayout(jPanel3Layout);
      jPanel3Layout.setHorizontalGroup(
          jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
          .addGroup(jPanel3Layout.createSequentialGroup()
              .addContainerGap()
              .addComponent(jPanel2, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
              .addContainerGap())
      );
      jPanel3Layout.setVerticalGroup(
          jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
          .addGroup(jPanel3Layout.createSequentialGroup()
              .addContainerGap()
              .addComponent(jPanel2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
              .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
      );
  
      jLabel8.setFont(new java.awt.Font("Segoe UI Symbol", 1, 18)); // NOI18N
      jLabel8.setForeground(new java.awt.Color(255, 255, 255));
      jLabel8.setText("Enter Student Details");
  
      javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
      jPanel1.setLayout(jPanel1Layout);
      jPanel1Layout.setHorizontalGroup(
          jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
          .addGroup(jPanel1Layout.createSequentialGroup()
              .addContainerGap()
              .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                  .addComponent(jLabel8)
                  .addComponent(jPanel3, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
              .addContainerGap(21, Short.MAX_VALUE))
      );
      jPanel1Layout.setVerticalGroup(
          jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
          .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel1Layout.createSequentialGroup()
              .addContainerGap()
              .addComponent(jLabel8)
              .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 95, Short.MAX_VALUE)
              .addComponent(jPanel3, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
              .addGap(24, 24, 24))
      );
  
      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)
          .addGroup(layout.createSequentialGroup()
              .addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
              .addContainerGap())
      );
  
      pack();
  }// &lt;/editor-fold&gt;                        
  
  private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                         
      Student newStudent = new Student();
  
      newStudent.setFirstName(jTextField1.getText());
      newStudent.setSurname(jTextField2.getText());
      newStudent.setNICNo(jTextField4.getText());
      newStudent.setBatchCode(jTextField5.getText());
      newStudent.setStudentNo(jTextField6.getText());
      newStudent.setTelNo(jTextField7.getText());
  
      if(checkEmpty()){
          JPanel msg = new JPanel();
          JOptionPane.showMessageDialog(msg, "Please Fill all the Fields!", "Error", JOptionPane.ERROR_MESSAGE);
      }
  
      else{
          addStudent();
          Arraylists.arrayStudent.add(newStudent);
  
          JPanel msg = new JPanel();
          JOptionPane.showMessageDialog(msg, "Student Added Successfully!", "Success", JOptionPane.INFORMATION_MESSAGE);
  
          newStudent = null;
          this.setVisible(false);
          addStudent studentAdded = new addStudent();
          studentAdded.setVisible(true);
      }
  
  }                                        
  
  private void jComboBox1ActionPerformed(java.awt.event.ActionEvent evt) {                                           
      // TODO add your handling code here:
  }                                          
  
  private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {                                         
      this.dispose();
  }                                        
  
  private void jTextField2ActionPerformed(java.awt.event.ActionEvent evt) {                                            
      // TODO add your handling code here:
  }                                           
  
  public static void main(String args[]) {
      /* Set the Nimbus look and feel */
      //&lt;editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) "&gt;
      /* 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(addStudent.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
      } catch (InstantiationException ex) {
          java.util.logging.Logger.getLogger(addStudent.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
      } catch (IllegalAccessException ex) {
          java.util.logging.Logger.getLogger(addStudent.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
      } catch (javax.swing.UnsupportedLookAndFeelException ex) {
          java.util.logging.Logger.getLogger(addStudent.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
      }
      //&lt;/editor-fold&gt;
  
      /* Create and display the form */
      java.awt.EventQueue.invokeLater(new Runnable() {
          public void run() {
              new addStudent().setVisible(true);
          }
      });
  }
  
  // Variables declaration - do not modify                     
  private javax.swing.JButton jButton1;
  private javax.swing.JButton jButton2;
  private javax.swing.JComboBox jComboBox1;
  private javax.swing.JLabel jLabel1;
  private javax.swing.JLabel jLabel2;
  private javax.swing.JLabel jLabel3;
  private javax.swing.JLabel jLabel4;
  private javax.swing.JLabel jLabel5;
  private javax.swing.JLabel jLabel6;
  private javax.swing.JLabel jLabel7;
  private javax.swing.JLabel jLabel8;
  private javax.swing.JPanel jPanel1;
  private javax.swing.JPanel jPanel2;
  private javax.swing.JPanel jPanel3;
  private javax.swing.JTextField jTextField1;
  private javax.swing.JTextField jTextField2;
  private javax.swing.JTextField jTextField4;
  private javax.swing.JTextField jTextField5;
  private javax.swing.JTextField jTextField6;
  private javax.swing.JTextField jTextField7;
  // End of variables declaration                   
  
  private void setIcon() {
      setIconImage(Toolkit.getDefaultToolkit().getImage(getClass().getResource("Icon.png")));
  }
  </code></pre>
  
  <p>}</p>