JAVA Why it doesnt work? package javaapplication1; import javafx.event.ActionEve

Question

JAVA

Why it doesnt work?

package javaapplication1;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.layout.Pane;
import javafx.scene.paint.Color;
import javafx.scene.shape.Arc;
import javafx.scene.shape.ArcType;
import javafx.scene.text.Text;

public class PieChart extends Pane implements EventHandler<ActionEvent> {
public PieChart() {
repaint();
}

private Color[] colors = {Color.RED, Color.YELLOW, Color.GREEN, Color.BLUE,
Color.CYAN, Color.MAGENTA, Color.ORANGE, Color.PINK,
Color.GRAY};
private ChartModel model;
  
double width = 200;
double height = 200;
  
private void repaint() {
if (model == null) return;

double radius = Math.min(width, height) * 0.5 * 0.9;
double x = width / 2;
double y = height / 2;

String[] dataName = model.getDataName();
double[] data = model.getData();

double total = 0;
for (int i = 0; i < data.length; i++) {
total += data[i];
}

double angle1 = 0;
double angle2 = 0;
for (int i = 0; i < data.length; i++) {
angle1 = angle1 + angle2;
angle2 = Math.ceil(360 * data[i] / total);
Arc arc = new Arc(x, y, radius, radius, angle1, angle2);
arc.setType(ArcType.ROUND);
arc.setFill(colors[i % colors.length]);
getChildren().add(arc);
getChildren().add(new Text(
width / 2 + radius * Math.cos((angle1 + angle2 / 2) * 2 * Math.PI / 360),
height / 2 - radius * Math.sin((angle1+angle2 / 2) * 2 * Math.PI / 360), dataName[i]));
}
}

public void setModel(ChartModel newModel) {
model = newModel;
model.addActionListener(this);
repaint();
}

public ChartModel getModel() {
return model;
}

@Override
public void handle(ActionEvent e) {
repaint();
}
}

Explanation / Answer

In this program, what i have seen is that the main() method is missing. Here we dont have the public static void main method. Without this method program will not compile.

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