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Thread: I can't clone an object

  1. #1
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    Default I can't clone an object

    Sorry for a possibly stupid question in advance: I am just a beginner and just study Java. The compiler gives clonenotsupportedexception for the House house2 = (House)house1.clone() part of the code. I do not understand why as the House class implements the Cloneable interface. Thank you in advance for your hints and advice.

    public class House implements Cloneable, Comparable {
        private int id;
        private double area;
        private java.util.Date whenBuilt;
     
        public House(int id, double area) {
            this.id = id;
            this.area = area;
            whenBuilt = new java.util.Date();
        }
     
        public double getId() {
            return id;
        }
     
        public double getArea() {
            return area;
        }
     
        public java.util.Date getWhenBuilt() {
            return whenBuilt;
        }
     
        /** Override the protected clone method defined in the Object
         class, and strengthen its accessibility */
        public Object clone() throws CloneNotSupportedException {
            return super.clone();
        }
     
        /** Implement the compareTo method defined in Comparable */
        public int compareTo(Object o) {
            if (area > ((House)o).area)
                return 1;
            else if (area < ((House)o).area)
                return -1;
            else
                return 0;
        }
    }
    class Implement
    {
     
     
        public static void main (String [] args)
     
        {
            House house1 = new House(1, 1750.50);
            House house2 = (House)house1.clone();
        }
    }


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: I can't clone an object

    Please post the full text of the compiler's error message.
    If you don't understand my answer, don't ignore it, ask a question.

  3. #3
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    Default Re: I can't clone an object

    use try and catch Exception instead of the throwing one. I tried your code with try and catch and it worked. So use
    try
    {
    }catch(Exception e)
    {
    return this;
    }

    this should work

  4. #4
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    Default Re: I can't clone an object

    Norm and myjava! Thank you very much for your help! I was just inattentive and didn't read carefully enough what the compiler really told me. May be it was my greatest mistake. And now the answer seems so evident to me!

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