Why this can't running ?

Question

Class Circle {

private int radius;

public void setRadius(int radius) {

this.radius = radius;

}

public double area() {

return this.radius * this.radius * Math.PI;

}

}

public class Methods {

public static void main(String[] args) {

Circle c = new Circle();

c.setRadius(5);

System.out.println(c.area());

}

}

Answer 1

class should be spelled with small c.
Change "Class Circle" to "class Circle".