1. Java OOPS
2. String vs string buffer vs string builder
3. Why string is immutable
4. Java exception (final vs finally vs finalize)
5. Java collections everything is important(specially differences)
6.Java 8 features specially lambda expression, streams.
7. Comparable vs comparator with program
8. Duplicate elements program in java
9. 2 sum Java program
10. Java 8 important programs

Ur previous company experience is must as they ask in both of the rounds.

Spring, spring boot and spring mvc small topics covered everything from javatpoint.

Question

1. Java OOPS
2. String vs string buffer vs string builder
3. Why string is immutable
4. Java exception (final vs finally vs finalize) 
5. Java collections everything is important(specially differences) 
6.Java 8 features specially lambda expression, streams. 
7. Comparable vs comparator with program
8. Duplicate elements program in java
9. 2 sum Java program
10. Java 8 important programs

Ur previous company experience is must as they ask in both of the rounds.

Spring, spring boot and spring mvc small topics covered everything from javatpoint.

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