Finding the maximum of three doubles

import java.awt.Container;
import javax.swing.*;
public class DoubleMax extends JApplet
{
public void init()
{
JTextArea outputArea = new JTextArea();

String s1 = JOptionPane.showInputDialog( "Enter first floating-point value" );
String s2 = JOptionPane.showInputDialog( "Enter second floating-point value" );
String s3 = JOptionPane.showInputDialog( "Enter third floating-point value" );

double number1 = Double.parseDouble( s1 );
double number2 = Double.parseDouble( s2 );
double number3 = Double.parseDouble( s3 );

double max = maximum( number1, number2, number3 );

outputArea.setText( "number1: " + number1 + "\nnumber2: " + number2 + "\nnumber3: " + number3 +
"\nmaximum is: " + max );

// get the applet's GUI component display area
Container c = getContentPane();

// attach outputArea to Container c
c.add( outputArea );
}

// maximum method definition
public double maximum( double x, double y, double z )
{
return Math.max( x, Math.max( y, z ) );
}
}