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            图：常用集合类的继承关系
          -------java.lang.Object-------
            /                          \
           /                            \
         Collection                      \
         /         \                      \
        /           \                      \
       Set           List                  Map
      / \            /  \                  / \
     /   \          /    \                /   \
    /     \        /      \              /     \
   /       \      /        \            /       \

HashSet TreeSet ArrayList LinkedList HashMap TreeMap