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Java Lead Interview Questions
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What is the difference between abstract class and interface?
what primitive types of java is not thread safe? what’s the difference between final and finalize？ What is the difference between abstract class and interface? When to use abstract class and interface?
Difference between union and union all
spring: 1. why use spring 2. spring transaction 3. byName byType 4. autowired qualified 5. how to use restful api in spring 6. why have HTTP requests body 7. diff between put and post in restful api 8. which is more frequent in use, post or put 9. how to do unit test 10. difference between spring boot and spring java: 1. how much points of you java level 2. Is java pass by reference or by value 3. Talk about garbage collection 4. Which Java version do you use 5. diff between HashMap & HashTable 6. Are we using HashTable right now? If not what do we use? 7. Diff between hashTable and Concurrent HashMap 8. Do you know multithread? 9. volatile 10. checked exception vs unchecked exception sql: 1. isolation level 2. normalization
Normalization, SQL JOIN, Conceptual questions. What is a relational database? Resume Follow-up questions. UNION vs JOIN. Java - Integer palindrome, isAnagram with blank spaces. Writes logic on coderpad.
what is the principle of OOP and explain them in 1 sentence.
core java questions
1. about yourself. 2. design approach examples based on resume 3. diff bw join and union 4. 2 tables- table A-5 rows-- primary key 5. table B-10 rows- primary key in A is referenced by foreign key in B. A left join B- minimum num of rows. 6. benefits of inheritance. 7. does java support multiple inheritance 8. diff bet abstract class and interface. 9. can u create an instance of an abstract class- no. then why do you need a constructor. 10. in a abstract class, while inheriting should i override each and every method. 11. diff bw final, finally and finalize 12. concept of static 13. benefits and disadvantages of using static
What is normalization? and you have to describe those normal forms
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