com/javarush/task/task05/task0522/Circle.java:21: error: constructor Circle(double) is already defined in class com.javarush.task.task05.task0522.Circle 
public Circle(double x){       выдает

public class Circle {
    public double x;
    public double y;
    public double radius;

    public Circle(double x, double y){
        this.x=x;
        this.y = y;
    }
     public Circle(double y){
        this.x=2;
        this.y = y;
    }
    public Circle(){}
    public Circle(double x){
        this.x=x;
        this.y = 6;