Need help with College work Please

[DarkXBlaze]

hey i need some more help.
how do i find the max value entered?(see "bestScore = " its in Bold text)

import java.io.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.text.*;
import java.util.*;

public class A5_assignment extends JFrame
{
    private static final int WIDTH = 400;
    private static final int HEIGHT = 300;

    private JLabel numScoreL, totalOfScoreL, averageOfScoresL, maxScoreL;
    private JTextField numScoreTF, totalOfScoreTF, averageOfScoresTF, maxScoreTF;
    private JButton enterScoreB, clearB, exitB;
    
    private CalculateButtonHandler cbHandler;
    private ExitButtonHandler ebHandler;
    private ClearButtonHandler cbClearHandler; 
    
    public A5_assignment()
    {
	    
    	numScoreL = new JLabel("Test Score :",SwingConstants.RIGHT);
    	totalOfScoreL = new JLabel("Number of Scores:",SwingConstants.RIGHT);
    	averageOfScoresL = new JLabel("Average Score:",SwingConstants.RIGHT);
    	maxScoreL = new JLabel("Best Score:",SwingConstants.RIGHT);
        
    	numScoreTF = new JTextField(10);
    	totalOfScoreTF = new JTextField(10);
    	totalOfScoreTF.setEditable(false);
    	averageOfScoresTF = new JTextField(10);
    	averageOfScoresTF.setEditable(false);
    	maxScoreTF = new JTextField(10);
    	maxScoreTF.setEditable(false);
        
    	enterScoreB = new JButton("Enter Score");
        cbHandler = new CalculateButtonHandler();
        enterScoreB.addActionListener(cbHandler);
        
        clearB = new JButton("Clear");
        cbClearHandler = new ClearButtonHandler();
        clearB.addActionListener(cbClearHandler);
        
        exitB = new JButton("exit");
        ebHandler = new ExitButtonHandler();
        exitB.addActionListener(ebHandler);
        
        setTitle("Test Scores");
        
        Container pane = getContentPane();
        
        pane.setLayout(new GridLayout(5,2));
        
        pane.add(numScoreL);
        pane.add(numScoreTF);
        pane.add(totalOfScoreL);
        pane.add(totalOfScoreTF);
        pane.add(averageOfScoresL);
        pane.add(averageOfScoresTF);
        pane.add(maxScoreL);
        pane.add(maxScoreTF);
        pane.add(enterScoreB);
        pane.add(clearB);
        pane.add(exitB);
        
        setSize(WIDTH,HEIGHT);

        setDefaultCloseOperation(EXIT_ON_CLOSE);
      	setVisible(true);
    }

    private class CalculateButtonHandler implements ActionListener
    {
    	public void actionPerformed(ActionEvent e)
    	{
    		double score, numberOfScore, average, bestScore;
    		
    		score = Double.parseDouble(numScoreTF.getText());
    		numberOfScore = score + 1;
    		average = score / numberOfScore;
    		bestScore = ;
    		
    		totalOfScoreTF.setText(" " + area);
    		averageOfScoresTF.setText(" " + perimeter);
    		maxScoreTF.setText(" " + perimeter);
    	}
    }
  
    private class ClearButtonHandler implements ActionListener
    {
    	public void actionPerformed(ActionEvent e) 
    	{
    		numScoreTF.setText("");
    		totalOfScoreTF.setText("");
    		averageOfScoresTF.setText("");
    		maxScoreTF.setText("");
		}
    }   
    
    private class ExitButtonHandler implements ActionListener
    {
    	public void actionPerformed(ActionEvent e)
    	{
    		System.exit(0);
    	}
    }
    
    
    public static void main(String[] args)
    {
    	A5_assignment rectProg = new A5_assignment();
    }
}