50 lines
1.4 KiB
Java
50 lines
1.4 KiB
Java
/*
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* Author: CHEN Yongyuan (Walter) 1930006025 from OOP(1007)
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* Date: 2022-04-14
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* Description: Square class inherited from Rectangle class
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*/
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public class Square extends Rectangle {
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/**
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* Constructor.
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*
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* @param x the x coordinate center of the square
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* @param y the y coordinate center of the square
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* @param size the size of the square
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*/
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public Square(double x, double y, double size) {
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super(x, y, size, size);
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}
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/**
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* Test.
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*/
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public static void testSquare() {
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Square s = new Square(1.2, 3.4, 5.0);
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// getX, getY, and move are inherited from Shape.
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// area and resize are inherited from Rectangle.
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System.out.println(s.getX() == 1.2);
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System.out.println(s.getY() == 3.4);
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System.out.println(s.area() == 25.0);
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// Move the square. The area does not change.
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s.move(7.8, 9.0);
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System.out.println(s.getX() == 9.0);
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System.out.println(s.getY() == 12.4);
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System.out.println(s.area() == 25.0);
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// Resize the square. The area changes but not the position.
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s.resize(12.0);
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System.out.println(s.getX() == 9.0);
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System.out.println(s.getY() == 12.4);
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System.out.println(s.area() == 144.0);
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// Resize the square again with different width and length!
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// Now the square is not square anymore!
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// The area changes but not the position.
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s.resize(10.0, 15.0);
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System.out.println(s.getX() == 9.0);
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System.out.println(s.getY() == 12.4);
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System.out.println(s.area() == 150.0);
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}
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}
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