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Why does StringBuffer/StringBuilder does not override the equals(), hashcode() methods from object?
Please suggest me clear picture that helps the understand the problem…
Because
StringBufferis mutable, and its primary use is for constructing strings. If you want to compare content, callStringBuffer#toString()and compare the returned value.It is not generally useful to override
hashCode()for mutable objects, since modifying such an object that is used as a key in aHashMapcould cause the stored value to be “lost.”