Day 1 (C / C++)

Day 2 (Intro to Java)

Day 3 (Basics of Java)

Day 4 (Classes)

Day 5 (RTTI/Generics/Optional)

Day 6 (Exception Handling)

Day 7 (Interfaces/Files/IO)

Day 8 (Collections)

Day 9 (Hashing/Nested Class)

Day 10 (Garbage Collection)

Day 11 (Lambda | Stream API)

Day 12 (Threading)

Day 13 (JDBC Part-1)

Day 14 (JDBC Part-2)