Please, help me!

Question about the task

Calling a constructor from a constructor

Java Syntax, Level 5, Lesson 9

Under discussion

I don't understand what is problem.

Figure out what the program does.
Correct the constructor with two parameters so that it calls another constructor with a radius of 10.
Think about which constructor you need to call.

Hint:
carefully study the implementation of the default constructor.

Requirements:

The class must have 3 constructors.
The constructor with two parameters must initialize the variables x and y to the passed values.
The constructor with two parameters must initialize the variable radius to a value of 10.
The constructor with two parameters must call another constructor, passing the correct arguments.
Don't change the main method.
Don't change the default constructor.

package com.codegym.task.task05.task0521; /* Calling a constructor from a constructor */ public class Circle { public double x; public double y; public double radius; public Circle(double x, double y, double radius) { this.x = x; this.y = y; this.radius = radius; } public Circle(double x, double y) { this(1, 2, 3); this.x = x; this.y = y; this.radius = 10; //write your code here } public Circle() { this(5, 5, 1); } public static void main(String[] args) { Circle circle = new Circle(); System.out.println(circle.x + " " + circle.y + " " + circle.radius); Circle anotherCircle = new Circle(10, 5); System.out.println(anotherCircle.x + " " + anotherCircle.y + " " + anotherCircle.radius); } }

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Anonymous #10428383

Level 12 , Seattle, United States

10 April 2019, 18:35

this(p1,p2,10); that's it. you need to add one more parameter to your constructor with has only two and it is making use of 3 parameters on print method. simple as is.:):):) do not initialize the instance variables just wrap them inside the constructor like this: this(p1,p2,10);

Nastya Varennikova

Level 11 , Sumy, Ukraine

6 April 2019, 21:13

Errors: com/codegym/task/task05/task0521/Circle.java:25: error: illegal start of expression public Circle() { ^ com/codegym/task/task05/task0521/Circle.java:25: error: ';' expected public Circle() { ^

Oleh

Level 32 , Kyiv, Ukraine

6 April 2019, 22:14

Something wrong with brackets. Looks like you put constructor inside another one.

Nastya Varennikova

Level 11 , Sumy, Ukraine

7 April 2019, 18:40

В задании ведь и требовалось поместить конструктор в конструктор.

Nastya Varennikova

Level 11 , Sumy, Ukraine

7 April 2019, 18:43

This is my code but it doesn't work

public class Circle {

    public double x;
    public double y;
    public double radius;

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

    public Circle(double x, double y) {
        this(1, 2, 3);
        this.x = x;
        this.y = y;
        this.radius = 10;
         public Circle() {
                         this(x,y,10);
                    }

                 //write your code here
    }

    public Circle() {
        this(5, 5, 1);
    }

    public static void main(String[] args) {
        Circle circle = new Circle();
        System.out.println(circle.x + " " + circle.y + " " + circle.radius);
        Circle anotherCircle = new Circle(10, 5);
        System.out.println(anotherCircle.x + " " + anotherCircle.y + " " + anotherCircle.radius);
    }
}

Oleh

Level 32 , Kyiv, Ukraine

8 April 2019, 09:16

Nope, the task was call another constructor. You have an example on line 25

public Circle() {
    this(5, 5, 1);
}

To make new one you need to do the same with another parameters (fives to x/y, one to ten).

Nastya Varennikova

Level 11 , Sumy, Ukraine

5 April 2019, 21:19

line 25: public Circle() {
                         this(x,y,10);
                    }

Khurram

Level 16 , Lahore, Pakistan

6 April 2019, 03:49

you got it!!