Exercise10_11.java:4: error: class Circle2D is public, should be declared in a file named Circle2D.java

can you fix this code for me this is the error i am getting

Exercise10_11.java:4: error: class Circle2D is public, should be declared in a file named Circle2D.java
public class Circle2D {

// Implement Circle2D class
public class Circle2D {
/** Data fields */
private double x;
private double y;
private double radius;

/** Create a default Circle2D with
* (0,0) for (x,y) and 1 for radius */
Circle2D() {
this(0, 0, 1);
}

/** Create a Circle2D with specified x,y, and radius */
Circle2D(double x, double y, double radius) {
this.x = x;
this.y = y;
this.radius = radius;
}

/** Return x */
public double getX() {
return x;
}

/** Return y */
public double getY() {
return y;
}

/** Return radius */
public double getRadius() {
return radius;
}

/** Return the area of the circle */
public double getArea() {
return Math.PI * Math.pow(radius, 2);
}

/** Return the perimeter of the circle */
public double getPerimeter() {
return 2 * Math.PI * radius;
}

/** Return true if the specified point
* (x, y) is inside this circle */
public boolean contains(double x, double y) {
return Math.sqrt(Math.pow(x - this.x, 2) +
Math.pow(y - this.y, 2))
< radius;
}

/** Return true if the specified
* circle is inside this circle */
public boolean contains(Circle2D circle) {
return Math.sqrt(Math.pow(circle.getX() - x, 2) +
Math.pow(circle.getY() - y, 2))
<= Math.abs(radius - circle.getRadius());
}

/** Return true if the specified
* circle overlaps with this circle */
public boolean overlaps(Circle2D circle) {
return Math.sqrt(Math.pow(circle.getX() - x, 2) +
Math.pow(circle.getY() - y, 2))
<= radius + circle.getRadius();
}
}