//: reusing/CADSystem.java

// Ensuring proper cleanup

package com.reusing07;

class Sharp {

Sharp(int i) { System.out.println(" Sharp Construct "); }

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

}

class Circle extends Sharp {

Circle(int i) {

super(i);

System.out.println(" Circle Construct ");

}

void dispose() {

System.out.println(" Dispose Circle ");

super.dispose();

}

}

class Triangle extends Sharp {

Triangle(int i) {

super(i);

System.out.println(" Triangle Construct ");

}

void dispose() {

System.out.println(" Dispose Triangle");

super.dispose();

}

}

class Line extends Sharp {

private int start, end;

Line(int start, int end) {

super(start);

this.start = start;

this.end = end;

System.out.println(" Drawing Line:" + start + ", " + end);

}

void dispose() {

System.out.println(" Dispose Line: " + start + ", " + end);

super.dispose();

}

}

public class CADSystem extends Sharp{

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);

}

this.c = new Circle(1);

this.t = new Triangle(1);

System.out.println(" Combined Constructor ");

}

void dispose() {

System.out.println(" Dispose CADSystem ");

t.dispose();

c.dispose();

for(int i = lines.length - 1; i > 0; i--) {

lines[i].dispose();

}

super.dispose();

}

public static void main(String[] args) {

// TODO Auto-generated method stub

CADSystem x = new CADSystem(47);

try {

//

} finally {

x.dispose();

}

}

}