import java.util.ArrayList; import java.util.Collections; import java.util.List; public class Test1 { public static void main(String[] args) throws Exception { List<Integer> list = new ArrayList<Integer>(); list.add(7); list.add(2); list.add(9); System.out.println(list); Collections.reverse(list); System.out.println(list); 输出结果：
[7, 2, 9] [9, 2, 7]
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