Mcqs on javs

What is qualifier? What is singleton class? What are different garbage collectors? Features of java 8? When can finally block not work? Can we change the chronology of public static void main? What is lifecycle of a servlet? What is life cycle of jsp? what is object in jsp? Collections? what is diff bet. list and set? What is marker interface? What is functional interface? What is default interface? what is directive in jsp? Get the second highest salary from salary table mysql? Explain dependency injection using getter setter method. What is volatile in java? Using java stream, count the number of occurrences of each characters in a string. What is iterator in java? How will you prvent ddos attack? what are the different api getaways you can use in spring boot java? How will you keep record of what api will do what like is there any api registry or store? How to create a custom exception in java? What is cursor in mysql? Is ajax asynchronous or synchronous? Tell all annotations in spring boot? explain .equals() and == in java? Explain == and === in javascript? Are there datatypes in javascript? What is AOP? Is constructor in singleton public or protected? Disadvantages of trigger in mysql? What is Bean in spring boot? What is Interceptor and what is filter? What is static synchronized in java? What is transient in java