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在new hashset时，实际内部是在进行hashmap，hashset不允许有重复的值，hashmap不允许有重复的key，HashMap由数组+链表组成的。二者进行存储时会进行一个hashcode方法和一个equals方法，先hashcode判断两个对象的hash值是否相同，如果不同代表不是相同的对象，会在数组中添加上元素，如果相同会再进行equals方法，比较两个对象的内容是否相同，如果相同，代表是同一个元素，不能存储，如果不同，就可以存储。个人理解，可以参考一下。
最直接的方法 https://download.java.net/openjdk/jdk8 找jdk源代码比较下