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Update Java基础知识疑难点.md

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Original file line number	Diff line number	Diff line change
`@@ -27,7 +27,7 @@ Objects.equals(null,"SnailClimb");// false`
`27`	`27`	我们看一下`java.util.Objects#equals`的源码就知道原因了。
`28`	`28`	```java
`29`	`29`	`public static boolean equals(Object a, Object b) {`
`30`		`- // 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。`
	`30`	`+ // 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。`
`31`	`31`	`return (a == b) \|\| (a != null && a.equals(b));`
`32`	`32`	`}`
`33`	`33`	```

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