solution

src/main/java/core/basesyntax/HelloWorld.java

@@ -1,8 +1,25 @@
 package core.basesyntax;
 
-/**
- * Feel free to remove this class and create your own.
- */
+import core.basesyntax.figures.Figure;
+import core.basesyntax.service.FigureSupplier;
+import core.basesyntax.variables.Constants;
+
 public class HelloWorld {
+    public static void main(String[] args) {
+        FigureSupplier figureSupplier = new FigureSupplier();
+
+        final Figure[] figures = new Figure[Constants.NUMBER_OF_FIGURES];
+
+        for (int i = 0; i < Constants.HALF; i++) {
+            figures[i] = figureSupplier.getRandomFigure();
+        }
+
+        for (int i = Constants.HALF; i < Constants.NUMBER_OF_FIGURES; i++) {
+            figures[i] = figureSupplier.getDefaultFigure();
+        }
 
+        for (Figure figure : figures) {
+            System.out.println(figure);
+        }
+    }
 }

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

@@ -0,0 +1,34 @@
+package core.basesyntax.figures;
+
+import core.basesyntax.variables.Color;
+
+public class Circle extends Figure {
+    private double radius;
+
+    public Circle(Color color, double radius) {
+        super(color);
+        this.radius = radius;
+    }
+
+    public double getRadius() {
+        return radius;
+    }
+
+    public void setRadius(double radius) {
+        this.radius = radius;
+    }
+
+    @Override
+    public double calculateArea() {
+        return 2 * Math.pow(radius, 2) * Math.PI;
+    }
+
+    @Override
+    public String toString() {
+        return "Figure: circle"
+                + ", area: " + calculateArea()
+                + " sq. units"
+                + ", radius: " + getRadius()
+                + ", color: " + getColor();
+    }
+}

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

@@ -0,0 +1,19 @@
+package core.basesyntax.figures;
+
+import core.basesyntax.variables.Color;
+
+public abstract class Figure implements FigureBehavior {
+    private Color color;
+
+    public Figure(Color color) {
+        this.color = color;
+    }
+
+    public Color getColor() {
+        return color;
+    }
+
+    public void setColor(Color color) {
+        this.color = color;
+    }
+}

src/main/java/core/basesyntax/figures/FigureBehavior.java

@@ -0,0 +1,5 @@
+package core.basesyntax.figures;
+
+public interface FigureBehavior {
+    double calculateArea();
+}

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

@@ -0,0 +1,65 @@
+package core.basesyntax.figures;
+
+import core.basesyntax.variables.Color;
+
+public class IsoscelesTrapezoid extends Figure {
+    private double top;
+    private double bottom;
+    private double height;
+
+    public IsoscelesTrapezoid(Color color, double top, double bottom, double side) {
+        super(color);
+        this.top = top;
+        this.bottom = bottom;
+        this.height = side;
+    }
+
+    public double getTop() {
+        return top;
+    }
+
+    public void setTop(double top) {
+        this.top = top;
+    }
+
+    public double getBottom() {
+        return bottom;
+    }
+
+    public void setBottom(double bottom) {
+        this.bottom = bottom;
+    }
+
+    public double getSide() {
+        return height;
+    }
+
+    public void setSide(double side) {
+        this.height = side;
+    }
+
+    public double getHeight() {
+        return height;
+    }
+
+    public void setHeight(double height) {
+        this.height = height;
+    }
+
+    @Override
+    public double calculateArea() {
+        return (top + bottom) * height / 2;
+    }
+
+    @Override
+    public String toString() {
+        return "Figure: right triangle"
+                + ", area: " + calculateArea()
+                + " sq. units"
+                + ", top: " + getTop()
+                + ", bottom: " + getBottom()
+                + ", side: " + getSide()
+                + ", height: " + getHeight()
+                + ", color: " + getColor();
+    }
+}

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

@@ -0,0 +1,45 @@
+package core.basesyntax.figures;
+
+import core.basesyntax.variables.Color;
+
+public class Rectangle extends Figure {
+    private double firstSide;
+    private double secondSide;
+
+    public Rectangle(Color color, double firstSide, double secondSide) {
+        super(color);
+        this.firstSide = firstSide;
+        this.secondSide = secondSide;
+    }
+
+    public double getFirstSide() {
+        return firstSide;
+    }
+
+    public void setFirstSide(double firstSide) {
+        this.firstSide = firstSide;
+    }
+
+    public double getSecondSide() {
+        return secondSide;
+    }
+
+    public void setSecondSide(double secondSide) {
+        this.secondSide = secondSide;
+    }
+
+    @Override
+    public double calculateArea() {
+        return firstSide * secondSide;
+    }
+
+    @Override
+    public String toString() {
+        return "Figure: rectangle"
+                + ", area: " + calculateArea()
+                + " sq. units"
+                + ", first side: " + getFirstSide()
+                + ", second side: " + getSecondSide()
+                + ", color: " + getColor();
+    }
+}

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

@@ -0,0 +1,45 @@
+package core.basesyntax.figures;
+
+import core.basesyntax.variables.Color;
+
+public class RightTriangle extends Figure {
+    private double firstLeg;
+    private double secondLeg;
+
+    public RightTriangle(Color color, double firstLeg, double secondLeg) {
+        super(color);
+        this.firstLeg = firstLeg;
+        this.secondLeg = secondLeg;
+    }
+
+    public double getFirstLeg() {
+        return firstLeg;
+    }
+
+    public void setFirstLeg(double firstLeg) {
+        this.firstLeg = firstLeg;
+    }
+
+    public double getSecondLeg() {
+        return secondLeg;
+    }
+
+    public void setSecondLeg(double secondLeg) {
+        this.secondLeg = secondLeg;
+    }
+
+    @Override
+    public double calculateArea() {
+        return firstLeg * secondLeg / 2;
+    }
+
+    @Override
+    public String toString() {
+        return "Figure: right triangle"
+                + ", area: " + calculateArea()
+                + " sq. units"
+                + ", first leg: " + getFirstLeg()
+                + ", second leg: " + getSecondLeg()
+                + ", color: " + getColor();
+    }
+}

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

@@ -0,0 +1,34 @@
+package core.basesyntax.figures;
+
+import core.basesyntax.variables.Color;
+
+public class Square extends Figure {
+    private double side;
+
+    public Square(Color color, double side) {
+        super(color);
+        this.side = side;
+    }
+
+    public double getSide() {
+        return side;
+    }
+
+    public void setSide(double side) {
+        this.side = side;
+    }
+
+    @Override
+    public double calculateArea() {
+        return Math.pow(side, 2);
+    }
+
+    @Override
+    public String toString() {
+        return "Figure: square"
+                + ", area: " + calculateArea()
+                + " sq. units"
+                + ", side: " + getSide()
+                + ", color: " + getColor();
+    }
+}

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

@@ -0,0 +1,14 @@
+package core.basesyntax.service;
+
+import core.basesyntax.variables.Color;
+import java.util.Random;
+
+public class ColorSupplier {
+    private static final Random RANDOM = new Random();
+
+    public Color getRandomColor() {
+        int index = RANDOM.nextInt(Color.values().length);
+
+        return Color.values()[index];
+    }
+}

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

@@ -0,0 +1,51 @@
+package core.basesyntax.service;
+
+import core.basesyntax.figures.Circle;
+import core.basesyntax.figures.Figure;
+import core.basesyntax.figures.IsoscelesTrapezoid;
+import core.basesyntax.figures.Rectangle;
+import core.basesyntax.figures.RightTriangle;
+import core.basesyntax.figures.Square;
+import core.basesyntax.variables.Color;
+import core.basesyntax.variables.FigureType;
+import java.util.Random;
+
+public class FigureSupplier {
+    private static final Random RANDOM = new Random();
+    private static final ColorSupplier colorSupplier = new ColorSupplier();
+    private static final double DEFAULT_RADIUS = 10;
+
+    public Figure getRandomFigure() {
+        int index = RANDOM.nextInt(FigureType.values().length);
+        FigureType figureType = FigureType.values()[index];
+        Color color = colorSupplier.getRandomColor();
+
+        return switch (figureType) {
+            case SQUARE -> new Square(color, RANDOM.nextDouble());
+            case RECTANGLE -> new Rectangle(
+                    color,
+                    RANDOM.nextDouble(),
+                    RANDOM.nextDouble()
+            );
+            case RIGHT_TRIANGLE -> new RightTriangle(
+                    color,
+                    RANDOM.nextDouble(),
+                    RANDOM.nextDouble()
+            );
+            case CIRCLE -> new Circle(
+                    color,
+                    RANDOM.nextDouble()
+            );
+            default -> new IsoscelesTrapezoid(
+                    color,
+                    RANDOM.nextDouble(),
+                    RANDOM.nextDouble(),
+                    RANDOM.nextDouble()
+            );
+        };
+    }
+
+    public Figure getDefaultFigure() {
+        return new Circle(Color.WHITE, DEFAULT_RADIUS);
+    }
+}

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

@@ -0,0 +1,11 @@
+package core.basesyntax.variables;
+
+public enum Color {
+    RED,
+    YELLOW,
+    BLUE,
+    GREEN,
+    GRAY,
+    BLACK,
+    WHITE
+}

src/main/java/core/basesyntax/variables/Constants.java

@@ -0,0 +1,6 @@
+package core.basesyntax.variables;
+
+public class Constants {
+    public static final int NUMBER_OF_FIGURES = 10;
+    public static final int HALF = NUMBER_OF_FIGURES / 2;
+}

src/main/java/core/basesyntax/variables/FigureType.java

@@ -0,0 +1,9 @@
+package core.basesyntax.variables;
+
+public enum FigureType {
+    SQUARE,
+    RECTANGLE,
+    RIGHT_TRIANGLE,
+    CIRCLE,
+    ISOSCELES_TRAPEZOID
+}