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Thread: Sorting arrays in descending order with Collections class in Java

  1. #1
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    Angry Sorting arrays in descending order with Collections class in Java

    Hello friends am trying to create a java program to sort an array in ascending and descending order
    here is the program I created


    import java.util.Arrays;
    import java.util.Collections;
    public class ArraySort
    {
    public static void main(String [] args)
    {
    int [] num = {5,9,1,65,7,8,9};
    Arrays.sort(num);
    System.out.println("The rsorted array in ascending order");
    for(int i = 0; i<num.length; i++)
    {
    System.out.println(num[i]);
    }
    System.out.println("The rsorted array in descending order");
    Arrays.sort(num,Collections.reverseOrder(num));
    for(int i = 0; i<num.length; i++)
    {
    System.out.println(num[i]);
    }
    }
    }

    BUT I GET THE FOLLOWING EROOR ON COMPILATION

    ArraySort.java:12: error: no suitable method found for reverseOrder(int[])
    Arrays.sort(num,Collections.reverseOrder(num));
    ^
    method Collections.<T#1>reverseOrder(Comparator<T#1>) is not applicable
    (no instance(s) of type variable(s) T#1 exist so that argument type int[] conforms to formal parameter type Comparator<T#1>)
    method Collections.<T#2>reverseOrder() is not applicable
    (cannot instantiate from arguments because actual and formal argument lists differ in length)
    where T#1,T#2 are type-variables:
    T#1 extends Object declared in method <T#1>reverseOrder(Comparator<T#1>)
    T#2 extends Object declared in method <T#2>reverseOrder()
    1 error
    What's wrong with my program? Suggest a solution for me


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: Sorting arrays in descending order with Collections class in Java

    Please edit your post and wrap your code with code tags:
    [code=java]
    YOUR CODE GOES HERE
    [/code]
    to get highlighting and preserve formatting.

    error: no suitable method found for reverseOrder(int[])
    Where is that method with that args defined? Read the API doc for the method to see what args it takes.
    If you don't understand my answer, don't ignore it, ask a question.

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    Default Re: Sorting arrays in descending order with Collections class in Java

    Welcome to the forum! Please read this topic to learn how to post code in code or highlight tags and other useful info for new members.

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