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public class TestCircle1 {

public static void main(String[] args) {

Circle1 c1 = new Circle1(5.0);

System.out.println("the are of the circle of radius " + c1.radius + " is " + c1.getArea());

Circle1 c2 = new Circle1();

System.out.println("the are of the circle of radius " + c2.radius + " is " + c2.getArea());

c2.radius = 100;

System.out.println("the are of the circle of radius " + c2.radius + " is " + c2.getArea());

}

}

class Circle1 {

double radius;

Circle1() {

this.radius = 1.0;

}

Circle1(double radius) {

this.radius = radius;

}

double getArea() {

return radius * radius * Math.PI;

}

}

/*

the are of the circle of radius 5.0 is 78.53981633974483

the are of the circle of radius 1.0 is 3.141592653589793

the are of the circle of radius 100.0 is 31415.926535897932

*/