Help with Run Time Error Please....

Question

I got this Run Time error when I tried to execute a Swing program I was trying to run and I was wondering if anyone could explain what it meant and how I could go about fixing the situation. The program ran with no problem when I executed it yesterday but this morning, It failed for some reason .
My Classes name is GUIcheck.java
Exception in thread "main" java.lang.UnsupportedClassVersionError: GUIcheck (Unsupported major.minor version 49.0)
        at java.lang.ClassLoader.defineClass0(Native Method)
        at java.lang.ClassLoader.defineClass(Unknown Source)
        at java.security.SecureClassLoader.defineClass(Unknown Source)
        at java.net.URLClassLoader.defineClass(Unknown Source)
        at java.net.URLClassLoader.access$100(Unknown Source)
        at java.net.URLClassLoader$1.run(Unknown Source)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at java.lang.ClassLoader.loadClassInternal(Unknown Source)
I have posted the program below for your viewing ..
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class GUIcheck
    public static void main(String args[])
    JFrame.setDefaultLookAndFeelDecorated(true);
    JFrame frame = new JFrame ("Student Data Sheet");
    //Frame.setDefaultLookAndFeelDecorated(true);
   //Create the top panel.  This panel will use the grid layout and
   //will contain two labels (name and Social Security Number) and
   //two text boxes (nameTextField and ssTextField)
   JPanel topPanel = new JPanel(new GridLayout (2, 2, 5, 5));
   JLabel nameLabel = new JLabel ("Name:");
   topPanel.add(nameLabel);
   JTextField nameTextField = new JTextField(10);
   topPanel.add(nameTextField);
   JLabel ssLabel = new JLabel ("Social Security Number:");
   topPanel.add(ssLabel);
  JPasswordField ssTextField = new JPasswordField(10);
  topPanel.add(ssTextField);
  //Place the topPanel on the North side of the frame
  Container contentPane = frame.getContentPane();
  contentPane.add (topPanel, BorderLayout.NORTH);
  //Create the center panel.  It will be placed in the center of the
  //frame.  It will contain two sub panels.  One sub panel will contain
  //labels (Select sources of news and information and Classification).
  //The second sub panel will contain check boxes and radio buttons)
  JPanel centerPanel = new JPanel (new BorderLayout ());
  JPanel centerTopPanel = new JPanel (new GridLayout (1, 2, 5, 5));
  JLabel sourceLabel = new JLabel
             ("Select sources of news and information");
  centerTopPanel.add (sourceLabel);
  JLabel classLabel = new JLabel ("Classification");
  centerTopPanel.add (classLabel);
  centerPanel.add (centerTopPanel, BorderLayout.NORTH);
  JPanel centerBottomPanel = new JPanel (new GridLayout (1, 2, 5, 5));
  JPanel checkBoxPanel = new JPanel (new GridLayout (3, 1, 5, 1));
  JCheckBox newspaperCheckBox = new JCheckBox ("Newspaper");
  checkBoxPanel.add (newspaperCheckBox);
JCheckBox tvCheckBox = new JCheckBox ("TV");
checkBoxPanel.add (tvCheckBox);
JCheckBox friendsCheckBox = new JCheckBox ("Friends");
checkBoxPanel.add (friendsCheckBox);
centerBottomPanel.add (checkBoxPanel);
JPanel radioButtonPanel = new JPanel (new GridLayout (4, 1, 5, 1));
JRadioButton freshmanRadioButton = new JRadioButton ("Freshman");
radioButtonPanel.add (freshmanRadioButton);
JRadioButton sophomoreRadioButton = new JRadioButton ("Sophomore");
radioButtonPanel.add (sophomoreRadioButton);
JRadioButton juniorRadioButton = new JRadioButton ("Junior");
radioButtonPanel.add (juniorRadioButton);
JRadioButton seniorRadioButton = new JRadioButton ("Senior");
radioButtonPanel.add (seniorRadioButton);
centerBottomPanel.add (radioButtonPanel);
centerPanel.add (centerBottomPanel, BorderLayout.SOUTH);
contentPane.add (centerPanel, BorderLayout.CENTER);
//creation of button group deleted
//buttonPanel will contain buttons and will be placed at south side
//of the frame
JPanel buttonPanel = new JPanel(new GridLayout (1, 2, 5, 5));
JButton submitButton = new JButton ("Submit");
buttonPanel.add (submitButton);
JButton exitButton = new JButton ("Exit");
buttonPanel.add (exitButton);
contentPane.add (buttonPanel, BorderLayout.SOUTH);
  }//end main
}

Answer 1

I do have the 1.5 at the moment and I still get the same error. I have removed other instances of JRE from my computer and retried but it still persists... What else can I do?
Java Newbie