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Java (Strings (indexOf(), Length(), charAt(), compareTo(), contains(),…
Java
Strings
indexOf()
Length()
charAt()
compareTo()
contains()
endsWith()
replace(), replaceFirst() & replaceAll()
toUpperCase()
toLowercase()
equals()
==
Arrays
Date & Time
Methods
Files
Directories
Exceptions
Data Structure
Collections
Networking
Threading
Applets
Simple GUI
JDBC
Regular Exp
Apache PDF Box
Apache POI PPT
Apache POI Excel
Apache POI Word
Open CV
Apache Tika
iText