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Question about the task

Calling a constructor from a constructor

Java Syntax, Level 5, Lesson 9

Under discussion

plis whats wrong here

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.x = x; this.y = y; this.radius = 10; //Circle circle = new Circle(x, y, radius); this(x, y, radius); //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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Thomas

Level 41 , Bayreuth, Germany

9 June 2020, 08:15

First thing you need to remember is, that calling another constructor needs to be the first command inside the constructor. I'll show you on an example how to do it.

class myClass {
    String name;

    myClass() {
        this("Steve");
    }

    myClass(String name) {
        this.name = name;
    }
}