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修改对&和&&的表述 #12

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Update Java基础入门80问.md
xingjingye Aug 10, 2023
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Merge pull request #1 from xingjingye/xingjingye-patch-1
xingjingye Aug 10, 2023
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2 changes: 1 addition & 1 deletion docs/java/base/Java基础入门80问.md
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# 3.说说&和&&的区别

&和&&都可以用作逻辑与的运算符，表示逻辑与（and），当运算符两边的表达式的结果都为true时，整个运算结果才为true，否则，只要有一方为false，则结果为false。
&是位运算符，表示按位与，两边比较的是数值类型（基本数值类型byte、short、int、long等等），返回结果是一个数值，例如1 & 0 = 0；&&是逻辑运算符，表示逻辑与，两边比较的是布尔类型的数值，返回结果是布尔数值，例如true && false = false。当&&运算符两边的表达式的结果都为true时，整个运算结果才为true，否则，只要有一方为false，则结果为false。

&&还具有短路的功能，即如果第一个表达式为false，则不再计算第二个表达式，例如，对于if(str != null && !str.equals(“”))表达式，当str为null时，后面的表达式不会执行，所以不会出现NullPointerException如果将&&改为&，则会抛出NullPointerException异常。If(x==33 & ++y>0) y会增长，If(x==33 && ++y>0)不会增长

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