71 lines
1.7 KiB
Java
71 lines
1.7 KiB
Java
/*
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* Author: CHEN Yongyuan (Walter) 1930006025 from OOP(1007)
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* Date: 2022/03/27
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* Description: This is the class for the many shapes.
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*/
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import java.util.ArrayList;
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public class ManyShapes {
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private ArrayList<Shape> allShapes;
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/**
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* Constructor
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*/
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public ManyShapes() {
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this.allShapes = new ArrayList<Shape>();
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}
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/**
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* addShape method takes a shape as argument and adds it to the arraylist.
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*
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* @param s the shape to be added
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*/
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public void addShape(Shape s) {
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this.allShapes.add(s);
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}
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/**
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* listAllShapes methods print out both the area and the type for each shape in
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* the arraylist. For example, if the arraylist currently contains a Square
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* object of size 5 and a Dot object the the listAllShapes method should print:
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*
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* Shape has area 25.0
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*
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* Shape has area 0.0
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*/
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public void listAllShapes() {
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for (Shape s : this.allShapes) {
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String type = "";
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if (s instanceof Square) {
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type = "Square";
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} else if (s instanceof Dot) {
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type = "Dot";
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} else if (s instanceof Circle) {
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type = "Circle";
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} else if (s instanceof Rectangle) {
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type = "Rectangle";
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} else if (s instanceof Shape) {
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type = "Shape";
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} else if (s instanceof Square) {
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type = "Square";
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}
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System.out.println(String.format("%s has area %f", type, s.area()));
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}
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}
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/**
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* Test.
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*/
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public static void testManyShapes() {
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ManyShapes m = new ManyShapes();
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m.addShape(new Circle(1.2, 3.4, 4.0)); // Upcast from Circle to Shape.
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m.addShape(new Dot(1.2, 3.4)); // Upcast from Dot to Shape.
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m.addShape(new Rectangle(1.2, 3.4, 4.0, 5.0)); // Upcast from Rectangle to Shape.
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m.addShape(new Shape(1.2, 3.4));
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m.addShape(new Square(1.2, 3.4, 5.0)); // Upcast from Square to Shape.
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m.listAllShapes();
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}
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}
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