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Thread: Can A String array be passed as a parameter to a method that takes object array as argument?

  1. #1
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    Default Can A String array be passed as a parameter to a method that takes object array as argument?

    public class Knuth { 
     
        private Knuth() { }
     
        public static void shuffle(Object[] a){
            int n = a.length;
            for (int i = 0; i < n; i++) {
                // choose index uniformly in [0, i]
                int r = (int) (Math.random() * (i + 1));
                Object swap = a[r];
                a[r] = a[i];
                a[i] = swap;
            }
        }
     
     
        public static void shuffleAlternate(Object[] a) {
            int n = a.length;
            for (int i = 0; i < n; i++) {
                // choose index uniformly in [i, n-1]
                int r = i + (int) (Math.random() * (n - i));
                Object swap = a[r];
                a[r] = a[i];
                a[i] = swap;
            }
        }
     
     
        public static void main(String[] args) {
     
            // read in the data
            String[] a = StdIn.readAllStrings();
     
            // shuffle the array
            Knuth.shuffle(a);
     
            // print results.
            for (int i = 0; i < a.length; i++)
                StdOut.println(a[i]);
        }
    }
    Last edited by Md Abdullah Shuvo; March 24th, 2021 at 02:52 AM. Reason: I got the wrong category as I am new in this group. I want to delete this post or change the category.

  2. #2
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    Default Can A String array be passed as a parameter to a method that takes object array as argument?

    public class Knuth {

    private Knuth() { }

    public static void shuffle(Object[] a)
    {
    int n = a.length;
    for (int i = 0; i < n; i++) {
    // choose index uniformly in [0, i]
    int r = (int) (Math.random() * (i + 1));
    Object swap = a[r];
    a[r] = a[i];
    a[i] = swap;
    }
    }


    public static void shuffleAlternate(Object[] a) {
    int n = a.length;
    for (int i = 0; i < n; i++) {
    // choose index uniformly in [i, n-1]
    int r = i + (int) (Math.random() * (n - i));
    Object swap = a[r];
    a[r] = a[i];
    a[i] = swap;
    }
    }


    public static void main(String[] args) {

    // read in the data
    String[] a = StdIn.readAllStrings();
     
            // shuffle the array
            Knuth.shuffle(a);

    // print results.
    for (int i = 0; i < a.length; i++)
    StdOut.println(a[i]);
    }
    }

  3. #3
    Super Moderator Norm's Avatar
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    Default Re: Can A String array be passed as a parameter to a method that takes object array as argument?

    What happens when you compile and execute the code?
    If you don't understand my answer, don't ignore it, ask a question.

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