48 lines
1.1 KiB
Java
48 lines
1.1 KiB
Java
|
// patterns/ShapeFactory1.java
|
||
|
|
// (c)2017 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.
|
||
|
|
// A simple static factory method
|
||
|
|
import java.util.*;
|
||
|
|
import java.util.stream.*;
|
||
|
|
import patterns.shapes.*;
|
||
|
|
|
||
|
|
class StaticFactory {
|
||
|
|
static Shape create(String type) {
|
||
|
|
switch(type) {
|
||
|
|
case "Circle": return new Circle();
|
||
|
|
case "Square": return new Square();
|
||
|
|
case "Triangle": return new Triangle();
|
||
|
|
default:
|
||
|
|
throw new BadShapeCreation(type);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
public class ShapeFactory1 {
|
||
|
|
public static void main(String[] args) {
|
||
|
|
Stream.of("Circle", "Square", "Triangle",
|
||
|
|
"Square", "Circle", "Circle", "Triangle")
|
||
|
|
.map(StaticFactory::create)
|
||
|
|
.peek(Shape::draw)
|
||
|
|
.peek(Shape::erase)
|
||
|
|
.count(); // Terminal operation
|
||
|
|
}
|
||
|
|
}
|
||
|
|
/* Output:
|
||
|
|
Circle[0] draw
|
||
|
|
Circle[0] erase
|
||
|
|
Square[1] draw
|
||
|
|
Square[1] erase
|
||
|
|
Triangle[2] draw
|
||
|
|
Triangle[2] erase
|
||
|
|
Square[3] draw
|
||
|
|
Square[3] erase
|
||
|
|
Circle[4] draw
|
||
|
|
Circle[4] erase
|
||
|
|
Circle[5] draw
|
||
|
|
Circle[5] erase
|
||
|
|
Triangle[6] draw
|
||
|
|
Triangle[6] erase
|
||
|
|
*/
|