Step3 racing#13

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lygggg wants to merge 3 commits intoitaewon-coding-dojo:masterfrom

lygggg:step2_racing

Commits on Jun 4, 2020

Practiced the 1 stage Java test.
lygggg
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Commits on Jun 7, 2020

Practiced the 2 stage Java Calculate test.
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Commits on Jun 9, 2020

Practiced the 2 stage java test
lygggg
committed