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Merge pull request Snailclimb#39 from kinglaw1204/patch-4

添加jdk1.8解决HashMap扩容死循环问题

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`@@ -192,6 +192,7 @@ static int hash(int h) {`
`192`	`192`
`193`	`193`	`这个过程为,先将 A 复制到新的 hash 表中,然后接着复制 B 到链头(A 的前边:B.next=A),本来 B.next=null,到此也就结束了(跟线程二一样的过程),但是,由于线程二扩容的原因,将 B.next=A,所以,这里继续复制A,让 A.next=B,由此,环形链表出现:B.next=A; A.next=B`
`194`	`194`
	`195`	`+注意:jdk1.8已经解决了死循环的问题。`
`195`	`196`
`196`	`197`
`197`	`198`	`## HashSet 和 HashMap 区别`

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