Create basic_calculator.java

[dzf0023]

I just create a java version

[YaoyaoChang]

您好，您的邮件我已经收到，我一定会尽快回复的！谢谢！【此为自动回复邮件】Hello, I've received your email. I will reply to you as soon as possible! Thank you! 【This is an automatic reply email】

[yangizone]

这是来自QQ邮箱的假期自动回复邮件。   您好，我最近正在休假中，无法亲自回复您的邮件。我将在假期结束后，尽快给您回复。