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1£®ÒÔÏ´úÂëµÄÖ´Ðнá¹ûÊÇ£¿¡¾µ¥ÏîÑ¡ÔñÌâ¡¿¡¾¼òµ¥¡¿ public class Example { public static void main(String[] args) { String s1 = "abc"; String s2 = "def"; Stack<String> stack = n