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Commit d13b3b8

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修复文档显示错误
markdown标准语法应该有个空格
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‎contents/java-operator.md

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##Java += 操作符实质
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##Java += 操作符实质
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###问题
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###问题
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我之前以为:
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i += j 等同于 i = i + j;
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但假设有:
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这时 i = i + j 不能编译,但 i += j 却可以编译。这说明两者还是有差别的
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这是否意味着,i += j,实际是等同于 i= (type of i) (i + j)呢?
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###回答
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###回答
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这个问题,其实官方文档中已经解答了。 请看这里 [§15.26.2 Compound Assignment Operators](http://docs.oracle.com/javase/specs/jls/se8/html/jls-15.html#jls-15.26.2)
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