自己寫的類要能夠添加到TreeSet中進行排序，該類需要實現(xiàn)Comparable接口
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class?MyClass?implements?Comparable?{
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????
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????public?int?compareTo(Object?o)?{
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????????int?i;
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????????MyClass?mc?=?(MyClass)o;
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???????????//比較
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????????return?i;?//相等為0，大于則i>0，小于i<0
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????}
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????
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} 或者，另寫一個類實現(xiàn)Comparator，然后初始化TreeSet時，new TreeSet(new MyComparator())
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public?class?MyComparator?implements?Comparator?{
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????public?int?compare(Object?o1,?Object?o2)?{
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????????int?i;
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????????MyClass?mc1?=?(MyClass)o1;
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????????MyClass?mc2?=?(MyClass)o2;
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??????????//比較
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????????return?i;
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????}
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}