59 lines
1.4 KiB
Java
59 lines
1.4 KiB
Java
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class Polygon {
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private int[] sideLengths;
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public Polygon(int sides, int...lengths) {
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int index = 0;
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sideLengths = new int[sides];
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for (int length: lengths) {
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sideLengths[index] = length;
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index += 1;
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}
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}
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public int side(int number) {
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return sideLengths[number];
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}
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public int perimeter() {
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int total = 0;
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for (int index = 0; index < sideLengths.length; index += 1) {
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total += side(index);
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}
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return total;
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}
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}
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class Rectangle extends Polygon {
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private int width, height;
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public Rectangle(int width, int height) {
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super(4, new int[] { width, height, width, height });
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this.width = width;
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this.height = height;
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}
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public int area() {
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return this.width * this.height;
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}
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}
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class Square extends Polygon {
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private int sideLength;
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public Square(int sideLength) {
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super(4, new int[] { sideLength, sideLength, sideLength, sideLength });
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this.sideLength = sideLength;
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}
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public int area() {
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return this.sideLength * this.sideLength;
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}
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}
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class Shapes {
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public static void main(String[] args) {
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Rectangle wrecked = new Rectangle(3, 5); // Make a 3 × 5 rectangle.
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System.out.println(wrecked.area()); // Print its area, 15.
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System.out.println(wrecked.perimeter()); // Print its perimeter, 16.
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Square nerd = new Square(7); // Make a 7 × 7 square.
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System.out.println(nerd.area()); // Print its area, 49.
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System.out.println(nerd.perimeter()); // Print its perimeter, 28.
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}
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}
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