AbstractEx.java
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abstract class GraphicObject { protected int x, y; public GraphicObject(int x, int y){ this.x = x; this.y = y; } public void moveTo(int newX, int newY){ x = newX; y = newY; } abstract String shapeName(); abstract void resize(double multiplier); public void printDetails() { System.out.print(shapeName() + " at (" + x + ", " + y + ")"); } } class Rectangle extends GraphicObject { private double side1, side2; public Rectangle(int x, int y, double side1, double side2){ super(x, y); this.side1 = side1; this.side2 = side2; } public void resize(double multiplier){ side1 *= multiplier; side2 *= multiplier; } public String shapeName(){ return "Rectangle"; } public void printDetails(){ super.printDetails(); System.out.println(" of size " + side1 + ", " + side2); } } class Circle extends GraphicObject { private double radius; public Circle(int x, int y, double radius){ super(x, y); this.radius = radius; } public String shapeName(){ return "Circle"; } public void resize(double multiplier){ radius *= multiplier; } public void printDetails(){ super.printDetails(); System.out.println(" with radius " + radius); } } public class AbstractEx{ public static void main(String[] args){ GraphicObject r = new Rectangle(0, 0, 2.0, 3.0); r.printDetails(); r.moveTo(5,5); r.resize(1.5); r.printDetails(); GraphicObject c = new Circle(0, 0, 1.5); c.printDetails(); c.moveTo(10, 10); c.resize(Math.PI); c.printDetails(); } } |