Significance of "You need to enable Java to see this applet"

Question

i am a novish for applet programming.
i have written the code for drawing a spectrum.
import java.applet.*;
import java.awt.*;
public class DrawingWithColor1 extends Applet {
int width, height;
int N = 25; // the number of colors created
Color[] spectrum; // an array of elements, each of type Color
Color[] spectrum2; // another array
public void init() {
width = getSize().width;
height = getSize().height;
setBackground( Color.black );
// Allocate the arrays; make them "N" elements long
spectrum = new Color[ N ];
spectrum2 = new Color[ N ];
// Generate the colors and store them in the arrays.
for ( int i = 1; i <= N; ++i ) {
// The three numbers passed to the Color() constructor
// are RGB components in the range [0,1].
// The casting to (float) is done so that the divisions will be
// done with floating point numbers, yielding fractional quotients.
// As i goes from 1 to N, this color goes from almost black to white.
spectrum[ i-1 ] = new Color( i/(float)N, i/(float)N, i/(float)N );
// As i goes from 1 to N, this color goes from almost pure green to pure red.
spectrum2[ i-1 ] = new Color( i/(float)N, (N-i)/(float)N, 0 );
public void paint( Graphics g ) {
int step = 90 / N;
for ( int i = 0; i < N; ++i ) {
g.setColor( spectrum[ i ] );
g.fillArc( 0, 0, 2*width, 2*height, 90+i*step, step+1 );
g.setColor( spectrum2[ i ] );
g.fillArc( width/3, height/3, 4*width/3, 4*height/3, 90+i*step, step+1 );
Then it is requires to enable java to see this applet.
i went to intenet explorer->tools->internet options->advanced->enabled jre(sun)and ok
Please help me how to proceed further to view the final output

Answer 1

If you're using Microsoft's JVM, I think you have to restart the browser after turning the JVM on.
But it's an old, crappy JVM anyway.
Install the Java plug-in from Sun.