Java,spring boot & Micro services

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Synechron Morgan Stanley 1.what is clauses in SQL? 2.how to return from run()?What callable? 3.What is singleton ?in multi-threading ? 4.even odd thread print thread print number order like 1,2,4,5.....? 5.What is clauses in oracle? 6.What is copyonwriteArraylist? 7.String is palindrom with best best case? 8. is test variable and testing() accessible in Class C? pkg 1{ Class A{ protected int test protected int testing() } pkg2 { class B extends class A { } class C extends class B { } } 9.Arralist vs linkedlist ? internal implemnetaion of both? 10.What are protected method of Object class?why clonable methods of object is protected ?is it for client 11.What is locks in multi-threading?What is retrant lock? 12.what are design patterns java you know

TIVITI 1.volatile keywords ? What is thread safety ? 2.final keywords 3.multi threading related to questions 4.message read from MQ 5.How success and failure returns in MQ