Should we learn all methods in string , stringBuffer in java

Question

Reg. String methods in java

Answer 1

Nope you don't have to learn them all, but when you need them fire up Google and ask it and after you used it you will remember it

Answer 2

ITS UP TO YOU
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https://www.infoworld.com/article/2076072/stringbuffer-versus-string.html
https://www.geeksforgeeks.org/stringbuffer-class-in-java/

Answer 3

Nothing to learn. Practice stuffs to a extend where you are habituated with that

Answer 4

learn stringBuffer, stringBuilder If you want make full use string manipulation