How to Sort Arraylist<Long> in Decreasing Order

How to sort ArrayListLong in decreasing order?

Here's one way for your list:

list.sort(null);
Collections.reverse(list);

Or you could implement your own Comparator to sort on and eliminate the reverse step:

list.sort((o1, o2) -> o2.compareTo(o1));

Or even more simply use Collections.reverseOrder() since you're only reversing:

list.sort(Collections.reverseOrder());

How to sort a List/ArrayList?

Collections.sort(testList);
Collections.reverse(testList);

That will do what you want. Remember to import Collections though!

Here is the documentation for Collections.

How to sort ArrayList in descending order

You should sort your movieList, assuming Movie contains genre String field, below is some quick example to sort it:

Comparator<Movie> comparator = new Comparator<Movie>() {
  @Override
  public int compare(Movie movie, Movie t1) {
    return movie.genre.compareTo(t1.genre);
  }
};

// ordered by genre
Collections.sort(movieList, comparator);    

// Reverse order by genre
Collections.sort(movieList, Collections.reverseOrder(comparator));

How to sort arrayListObject by object attribute long in Java

Your comparator should look similar to this

class TweetComparator implements Comparator<Tweet> {
    @Override
    public int compare(Tweet t1, Tweet t2) {
        return Long.compare(t1.getMillis(), t2.getMillis()); 
    }
}

note that static int Long.compare is since Java 7

How to sort ArrayListArrayListInteger in descending order Java

This is how you can achieve it with an Arraylist of strings.

ArrayList<String> list = new ArrayList<String>();
list.add("21,10");
list.add("19,25");
list.add("32,5");

Once you have your list, you can simply use Collections.sort() method.

Collections.sort(list);

For reverse order simply add another argument to the sort method.

Collections.sort(list, Collections.reverseOrder());

Print the list to verify.
System.out.println(list);

Here is a running code example.

https://onecompiler.com/java/3y7ahcm6x

How to Sort Date in descending order From Arraylist Date in android?

Create Arraylist<Date> of Date class. And use Collections.sort() for ascending order.

See sort(List<T> list)

Sorts the specified list into ascending order, according to the natural ordering of its elements.

For Sort it in descending order See Collections.reverseOrder()

Collections.sort(yourList, Collections.reverseOrder());

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