package reuse;

class Shape {
    Shape(int i) {
        System.out.println("Shape constructor");
    }

    void dispose() {
        System.out.println("Shape dispose");
    }
}


class Circle extends Shape {
    Circle(int i) {
        super(i);
        System.out.println("Drawing Circle");
    }

    @Override
    void dispose() {
        System.out.println("Erasing Circle");
        super.dispose();
    }
}


class Triangle extends Shape {
    Triangle(int i) {
        super(i);
        System.out.println("Drawing Triangle");
    }

    @Override
    void dispose() {
        System.out.println("Erasing Triangle");
        super.dispose();
    }
}


class Line extends Shape {
    private int start, end;

    Line(int start, int end) {
        super(start);
        this.start = start;
        this.end = end;
        System.out.println("Drawing Line: " + start + ", " + end);
    }

    @Override
    void dispose() {
        System.out.println("Erasing Line: " + start + ", " + end);
        super.dispose();
    }
}


/**
 * @Author ZhangGJ
 * @Date 2020/04/29 22:24
 */
public class CADSystem extends Shape {
    private Circle c;
    private Triangle t;
    private Line[] lines = new Line[3];

    public CADSystem(int i) {
        super(i + 1);
        for (int j = 0; j < lines.length; j++) {
            lines[j] = new Line(j, j * j);
        }
        c = new Circle(1);
        t = new Triangle(1);
        System.out.println("Combined constructor");
    }

    @Override
    public void dispose() {
        System.out.println("CADSystem.dispose()");
        // The order of cleanup is the reverse
        // of the order of initialization:
        t.dispose();
        c.dispose();
        for (int i = lines.length - 1; i >= 0; i--) {
            lines[i].dispose();
        }
        super.dispose();
    }

    public static void main(String[] args) {
        CADSystem x = new CADSystem(47);
        try {
            // Code and exception handling...
        } finally {
            x.dispose();
        }
    }
}