created Circle

5. Classes/Circle.java

@@ -0,0 +1,57 @@
+public class Circle {
+
+    // private instance variables, not accessible from outside the class
+    private String colour;
+    private double radius;
+
+    // default constructor with no arguments
+    public Circle() {
+        radius = 1;
+        colour = "blue";
+
+
+    }
+// second constructor takes as argument the radius but has default colour
+
+    public Circle(double r) {
+        radius = r;
+        colour = "blue";
+
+    }
+
+    // public method to retrieve the radius
+    public double getRadius() {
+        return radius;
+    }
+
+    // public method to compute and return the area of circle
+    public double getArea() {
+        return (Math.round(radius * radius * Math.PI));
+    }
+
+    public Circle(double r, String c) {
+        this.radius = r;
+        this.colour = c;
+    }
+
+    public String getColour() {
+        return colour;
+    }
+
+    public void setRadius(double newRadius) {
+        radius = newRadius;
+    }
+
+    public void setColour(String newColour) {
+        colour = newColour;
+
+    }
+
+    @Override
+    public String toString() {
+        return "Circle{" +
+                "colour='" + colour + '\'' +
+                ", radius=" + radius +
+                '}';
+    }
+}

5. Classes/TestCircle.java

@@ -0,0 +1,29 @@
+public class TestCircle {
+
+    public static void main(String[] args) {
+        // Declare an instance of Circle class called circle1
+        // Invoke the default constructor
+        Circle circle1 = new Circle();
+        // invoke public methods
+        System.out.println("The circle has radius of" + circle1.getRadius() + "and area of" + circle1.getArea());
+        //declare an instance of Circle class called circle2
+        // invoke the second constructor
+        Circle circle2 = new Circle(8);
+        // invoke public methods
+        System.out.println("The circle has radius of " + circle2.getRadius() + " and area of " +
+                circle2.getArea());
+
+
+        Circle circle3 = new Circle(6, "PINK");
+        System.out.println(">>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>");
+
+        System.out.println("Radus :" + circle3.getRadius() +" "+"Area :" + circle3.getArea() + "; color : " + circle3.getColour());
+
+        circle3.setRadius(34);
+        circle3.setColour("PURPLE");
+
+        System.out.println("Radus : " + circle3.getRadius() + " Area : "
+                + circle3.getArea() + " color : " + circle3.getColour());
+
+    }
+}