Array inversion

import java.util.ArrayList;
import java.util.Collections;

public class array_reverse {
    public static void main(String[] args) {
        ArrayList<String> arrayList=new ArrayList<String>();
        arrayList.add("A");
        arrayList.add("B");
        arrayList.add("C");
        arrayList.add("D");
        arrayList.add("E");
        System.out.println("反转前序列："+arrayList);
        Collections.reverse(arrayList);
        System.out.println("反转后序列："+arrayList);
    }
}

The output result is:

Pre inversion sequence: [a, B, C, D, e] post inversion sequence: [e, a]