short a = 2;
a = a +2 //编译失败
a +=2 //编译成功
a = a +2 中第二个a是short类型，2常量默认是int，不能自动转换所以报错。
a +=2 中+=会默认将右边进行一个强转换， 即是a = (short)(a+2)
short +=2 跟short = short +2
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Origin blog.csdn.net/weixin_43859562/article/details/112891400
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