Java part: Valid parenthesis. Inherit a class and override add（int a, int b), return a+b. Garbage collection, finalized, which has override for String: +, - , *, /

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Java part: Valid parenthesis. Inherit a class and override  add（int a, int b), return a+b. Garbage collection, finalized, which has override for String: +, - , *, /

Sigiloso · Accepted Answer

Valid parenthesis can be found on Leetcode. Others are easy if you understand the concept

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