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Update Java基础知识疑难点.md

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weixsun 2021-09-06 22:56:57 +08:00
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docs/java/basis/Java基础知识疑难点.md
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@ -27,7 +27,7 @@ Objects.equals(null,"SnailClimb");// false
我们看一下`java.util.Objects#equals`的源码就知道原因了。
```java
public static boolean equals(Object a, Object b) {
// 可以避免空指针异常。如果a==null的话此时a.equals(b)就不会得到执行，避免出现空指针异常。
// 可以避免空指针异常。如果a=null的话此时a.equals(b)就不会得到执行，避免出现空指针异常。
return (a == b) || (a != null && a.equals(b));
}
```