created classes, interface and abstract class for them, class ColorSupplier with public String getRandomColor(), class FigureSupplier with public Figure getRandomFigure() and getDefaultFigure(), also created main with random and default figures

src/main/java/core/basesyntax/AreaCalculator.java

@@ -0,0 +1,5 @@
+package core.basesyntax;
+
+public interface AreaCalculator {
+    double getArea();
+}

src/main/java/core/basesyntax/Circle.java

@@ -0,0 +1,21 @@
+package core.basesyntax;
+
+public class Circle extends Figure {
+    private final double radius;
+
+    public Circle(String color, double radius) {
+        super(color);
+        this.radius = radius;
+    }
+
+    @Override
+    public void draw() {
+        System.out.println("Figure: circle, area: " + getArea()
+                + " sq.units, radius: " + radius + " units, color: " + getColor());
+    }
+
+    @Override
+    public double getArea() {
+        return Math.PI * radius * radius;
+    }
+}

src/main/java/core/basesyntax/Color.java

@@ -0,0 +1,9 @@
+package core.basesyntax;
+
+public enum Color {
+    BLUE,
+    RED,
+    YELLOW,
+    GREEN,
+    BLACK
+}

src/main/java/core/basesyntax/ColorSupplier.java

@@ -0,0 +1,12 @@
+package core.basesyntax;
+
+import java.util.Random;
+
+public class ColorSupplier {
+    private final Random random = new Random();
+    private final Color[] colors = Color.values();
+
+    public String getRandomColor() {
+        return colors[random.nextInt(colors.length)].toString();
+    }
+}

src/main/java/core/basesyntax/Drawable.java

@@ -0,0 +1,5 @@
+package core.basesyntax;
+
+public interface Drawable {
+    void draw();
+}

src/main/java/core/basesyntax/Figure.java

@@ -0,0 +1,13 @@
+package core.basesyntax;
+
+public abstract class Figure implements Drawable, AreaCalculator {
+    private final String color;
+
+    public Figure(String color) {
+        this.color = color;
+    }
+
+    public String getColor() {
+        return color;
+    }
+}

src/main/java/core/basesyntax/FigureSupplier.java

@@ -0,0 +1,38 @@
+package core.basesyntax;
+
+import java.util.Random;
+
+public class FigureSupplier {
+    static final int MAX_FIGURE_QUANTITY = 5;
+    static final double FIGURE_RADIUS = 9.0 + 1.0;
+    static final String DEFAULT_CIRCLE_COLOUR = Color.BLUE.name();
+    private final Random random = new Random();
+    private final ColorSupplier colorSupplier = new ColorSupplier();
+
+    public Figure getRandomFigure() {
+        String figureColor = colorSupplier.getRandomColor();
+        int randomFigure = random.nextInt(MAX_FIGURE_QUANTITY);
+
+        switch (randomFigure) {
+            case 0:
+                return new Circle(figureColor, random.nextDouble() * FIGURE_RADIUS);
+            case 1:
+                return new IsoscelesTrapezoid(figureColor, random.nextDouble() * FIGURE_RADIUS,
+                        random.nextDouble() * FIGURE_RADIUS, random.nextDouble() * FIGURE_RADIUS);
+            case 2:
+                return new Rectangle(figureColor, random.nextDouble() * FIGURE_RADIUS,
+                        random.nextDouble() * FIGURE_RADIUS);
+            case 3:
+                return new RightTriangle(figureColor, random.nextDouble() * FIGURE_RADIUS,
+                        random.nextDouble() * FIGURE_RADIUS);
+            case 4:
+                return new Square(figureColor, random.nextDouble() * FIGURE_RADIUS);
+            default:
+                return getDefaultFigure();
+        }
+    }
+
+    public Figure getDefaultFigure() {
+        return new Circle(DEFAULT_CIRCLE_COLOUR, FIGURE_RADIUS);
+    }
+}

src/main/java/core/basesyntax/IsoscelesTrapezoid.java

@@ -0,0 +1,26 @@
+package core.basesyntax;
+
+public class IsoscelesTrapezoid extends Figure {
+    private final double side1;
+    private final double side2;
+    private final double height;
+
+    public IsoscelesTrapezoid(String color, double side1, double side2, double height) {
+        super(color);
+        this.side1 = side1;
+        this.side2 = side2;
+        this.height = height;
+    }
+
+    @Override
+    public void draw() {
+        System.out.println("Figure: trapezoid, area: " + getArea()
+                + " sq.units, side1: " + side1 + " sq.units, side2: " + side2
+                + " sq.units, height: " + height + " units, color: " + getColor());
+    }
+
+    @Override
+    public double getArea() {
+        return 0.5 * (side1 + side2) * height;
+    }
+}

src/main/java/core/basesyntax/Main.java

@@ -0,0 +1,18 @@
+package core.basesyntax;
+
+public class Main {
+    public static void main(String[] args) {
+        FigureSupplier figureSupplier = new FigureSupplier();
+
+        Figure[] figures = new Figure[6];
+
+        for (int i = 0; i < figures.length; i++) {
+            figures[i] = (i < 3) ? figureSupplier.getRandomFigure()
+                    : figureSupplier.getDefaultFigure();
+        }
+
+        for (Figure figure : figures) {
+            figure.draw();
+        }
+    }
+}

src/main/java/core/basesyntax/Rectangle.java

@@ -0,0 +1,23 @@
+package core.basesyntax;
+
+public class Rectangle extends Figure {
+    private final double length;
+    private final double width;
+
+    public Rectangle(String color, double width, double length) {
+        super(color);
+        this.width = width;
+        this.length = length;
+    }
+
+    @Override
+    public void draw() {
+        System.out.println("Figure: rectangle, area: " + getArea() + " sq.units, length: "
+                + length + " sq.units, width: " + width + " units, color: " + getColor());
+    }
+
+    @Override
+    public double getArea() {
+        return length * width;
+    }
+}

src/main/java/core/basesyntax/RightTriangle.java

@@ -0,0 +1,24 @@
+package core.basesyntax;
+
+public class RightTriangle extends Figure {
+    private final double firstLeg;
+    private final double secondLeg;
+
+    public RightTriangle(String color, double firstLeg, double secondLeg) {
+        super(color);
+        this.firstLeg = firstLeg;
+        this.secondLeg = secondLeg;
+    }
+
+    @Override
+    public void draw() {
+        System.out.println("Figure: triangle, area: " + getArea()
+                + " sq.units, firstLeg: " + firstLeg + " sq.units, secondLeg: " + secondLeg
+                + " units, color: " + getColor());
+    }
+
+    @Override
+    public double getArea() {
+        return 0.5 * firstLeg * secondLeg;
+    }
+}

src/main/java/core/basesyntax/Square.java

@@ -0,0 +1,21 @@
+package core.basesyntax;
+
+public class Square extends Figure {
+    private final double side;
+
+    public Square(String color, double side) {
+        super(color);
+        this.side = side;
+    }
+
+    @Override
+    public void draw() {
+        System.out.println("Figure: square, area: " + getArea() + " sq.units, side: "
+                + side + " units, color: " + getColor());
+    }
+
+    @Override
+    public double getArea() {
+        return side * side;
+    }
+}