How to sort an ArrayList?

Question

I have a List of doubles in java and I want to sort ArrayList in descending order.

Input ArrayList is as below:

List<Double> testList = new ArrayList();

testList.add(0.5);

testList.add(0.2);

testList.add(0.9);

testList.add(0.1);

testList.add(0.1);

testList.add(0.1);

testList.add(0.54);

testList.add(0.71);

testList.add(0.71);

testList.add(0.71);

testList.add(0.92);

testList.add(0.12);

testList.add(0.65);

testList.add(0.34);

testList.add(0.62);

The out put should be like this

0.92

0.9

0.71

0.71

0.71

0.65

0.62

0.54

0.5

0.34

0.2

0.12

0.1

0.1

0.1

Answer 1

Try: 

Collections.sort(testList);

Collections.reverse(testList);

That will perform what you require. Remember to import Collections.

check out this doc.