90 lines
1.8 KiB
Java
90 lines
1.8 KiB
Java
/*
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* Author: CHEN Yongyuan (Walter) 1930006025 from OOP(1007)
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* Date: 2022-04-15
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* Description: This is the abstract Shape class.
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*/
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public abstract class Shape {
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/*
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* Store the position of the central point of the shape.
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*/
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private double x;
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private double y;
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/**
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* Constructor of the Shape class.
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*
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* @param x the x-coordinate of the central point of the shape.
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* @param y the y-coordinate of the central point of the shape.
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*/
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public Shape(double x, double y) {
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this.x = x;
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this.y = y;
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}
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/**
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* Getter of the x coordinate of the central point of the shape.
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*
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* @return the x coordinate of the central point of the shape.
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*/
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public double getX() {
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return x;
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}
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/**
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* Getter of the y coordinate of the central point of the shape.
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*
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* @return the y coordinate of the central point of the shape.
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*/
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public double getY() {
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return y;
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}
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/**
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* Move the central point of the shape by amounts dx and dy.
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*
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* @param dx the amount of movement in x direction.
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* @param dy the amount of movement in y direction.
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*/
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public void move(double dx, double dy) {
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x += dx;
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y += dy;
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}
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/**
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* Abstract method to calculate the area of the shape.
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*
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* @return the area of the shape.
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*/
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public abstract double area();
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/**
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* Abstract method to resize the shape.
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*
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* @param newSize the new size of the shape.
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* @throws CannotResizeException
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*/
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public abstract void resize(double newSize) throws CannotResizeException;
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/**
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* Test.
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*/
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public static void testShape() {
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Shape s = new Shape(3.9, 4.2) {
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@Override
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public double area() {
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return 0;
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}
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@Override
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public void resize(double newSize) {
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}
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};
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System.out.println(s.getX() == 3.9);
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System.out.println(s.getY() == 4.2);
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s.move(1.0, 2.0);
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System.out.println(s.getX() == 4.9);
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System.out.println(s.getY() == 6.2);
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}
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}
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