how to sort an arraylist?

Code:

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private void add(ArrayList v)
        {
                ArrayList arrayList = new ArrayList();
                for(int j=0; j<v.size(); j++)
                {
                        arrayList.add(v.get(j));
                }
                for(int i=0;i<ret.size();i++)
                {
                        if(Collections.sort(arrayList) ==ret.get(i))
                        ret.add(Collections.sort(arrayList));
                }
        }

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that is my code... im trying to sort arrayList and im getting this error
"'void' type not allowed here"

please help

This code doesn't make much sense to me, sorry. What are you trying to do here? If you're trying to sort an ArrayList, you simply call Collections.sort(myList) and be done with it. Note that the items in the arraylist should implement the Comparable interface.

lol i got it...all i did was first sort the array then use the array in the if statements

Quote:

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Originally Posted by zhangster

lol i got it...all i did was first sort the array then use the array in the if statements

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So, does this mean that your question is solved? If so, great, and please mark the thread "Solved". If not, then please clarify what still needs fixing.

Best of luck!

Look into SortedSet subclasses, such as TreeSet. Note that Set requires that the elements be unique, unlike a list. You can then just do something like

Code:

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SortedSet sortedSet = new TreeSet(myArrayList);

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Quote:

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Originally Posted by zhangster

Code:

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                ArrayList arrayList = new ArrayList();
                for(int j=0; j<v.size(); j++)
                {
                        arrayList.add(v.get(j));
                }

---

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This hurts; the ArrayList class takes a copy constructor so that loop is not needed:

Code:

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ArrayList arrayList= new ArrayList(v);

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kind regards,

Jos