reverse an arraylist in java code example
Example 1: how to reverse a list in java
List<String> stringList = Arrays.asList("A", "B", "C");
Collections.reverse(stringList);
assertThat(stringList).containsExactly("C", "B", "A");
Example 2: how to reverse order of arraylist
ArrayList<Integer> arrlist = new ArrayList<Integer>();
Collections.reverse(arrlist);
Collections.sort(arrlist, Collections.reverseOrder());
Example 3: reverse arraylist java recursion
public ArrayList<Object> reverse(ArrayList<Object> arrayList) {
if(arrayList.size() > 1) {
Object value = arrayList.remove(0);
reverse(arrayList);
arrayList.add(value);
}
return arrayList;
}