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OnJava8-Examples/reuse/CADSystem.java at master · xinan-w/OnJava8-Examples · GitHub

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// reuse/CADSystem.java

// (c)2021 MindView LLC: see Copyright.txt

// We make no guarantees that this code is fit for any purpose.

// Visit http://OnJava8.com for more book information.

// Ensuring proper cleanup

// {java reuse.CADSystem}

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();

}

}

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();

}

}

}

/* Output:

Shape constructor

Shape constructor

Drawing Line: 0, 0

Shape constructor

Drawing Line: 1, 1

Shape constructor

Drawing Line: 2, 4

Shape constructor

Drawing Circle

Shape constructor

Drawing Triangle

Combined constructor

CADSystem.dispose()

Erasing Triangle

Shape dispose

Erasing Circle

Shape dispose

Erasing Line: 2, 4

Shape dispose

Erasing Line: 1, 1

Shape dispose

Erasing Line: 0, 0

Shape dispose

Shape dispose

*/

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