zl---完成jvm第二次作业，并调整代码结构#59

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Commits on Apr 8, 2017

Merge pull request #4 from DonaldY/master
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Commits on Apr 10, 2017

Merge pull request #5 from DonaldY/master
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Commits on Apr 12, 2017

完成第五周作业，并调整项目结构
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