The following file produces an error on line 16383, which is a bit wrong. The error is:

javac -g Tree.java
Tree.java:16383: Invalid method declaration; return type required.
 
^
1 error

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import java.awt.*;
 
public class Tree extends Canvas {
    private final static int WIDTH = 300;
    private final static int HEIGHT = 500;
    private final static int BORDER = 5;
 
    private final static int MIDDLE_X = WIDTH / 2;
    private final static int MIDDLE_Y = HEIGHT / 2;
    private final static int TOP = BORDER;
    private final static int BOTTOM = HEIGHT - BORDER;
    private final static int LEFT = BORDER;
    private final static int RIGHT = WIDTH - BORDER;
 
    private static int[] topX = { MIDDLE_X, LEFT + 30, RIGHT - 30 };
    private static int[] topY = { TOP, TOP + 100, TOP + 100 };
 
    private Polygon top;
 
    Tree() {
        top = new Polygon();
        for (i = 0; i < topX.length; i++)
            top.add(topX[i], topY[i]);
    }
 
    draw(Graphics g) {
        g.drawPolygon(top);
    }
}