Sort a List of String[]s?

Question

In Java I have List<String[]> myList and I would like to be able to sort it in various ways. For example sort it by row[0], or maybe row[0] and then by row[1], etc, where row[i] is the String[] at index i.

Can this be done or does Java not support it?

Have a look at the static methods in Comparator. E.g., to sort by the third element in each array, you could use the comparator List<String[]> list = ... ; list.sort(Comparator.comparing(a -> a[2])); — Joshua Taylor
– Joshua Taylor, Commented Sep 29, 2016 at 3:27

passion · Accepted Answer · 2016-09-29 03:34:50Z

3

An example of JDK1.7. You can change index in the comparator implementation .

List<String[]> myList = new ArrayList<String[]>();

myList.add(new String[]{"a","g","x"});
myList.add(new String[]{"c","f","y"});
myList.add(new String[]{"b","d","z"});

Collections.sort(myList, new Comparator<String[]>() {
    @Override
    public int compare(String[] o1, String[] o2) {
    return o1[0].compareTo(o2[0]);
    }
});

answered Sep 29, 2016 at 3:34

passion

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1 Comment

KaliMa Over a year ago

Huh, wasn't aware you could pass Comparators as an argument to Collections.sort(). Cool! Thanks.

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