TIAA Java Developer interview questions

1) Can we have overloaded methods with different return type Yes Provided number of arguments different. 2) Method overriding with access specifiers with example 3) Methods Overrriding with excetion handling with example 4) Abstract class with constructor and what is the use of constructor if we dont instantiate abstract class. 5) Can interface have no method in it 6) What is the default capacity of hashamp and working of hashamp if it reaches its maximum capacity. 7) What if we want to create custom object as key inside hashmap ,we have to do something in our code 8) What is the difference between @Component,@Repository,@Service and @Controller 9) What is the difference between IOC and Dependency Injection. 10) What is bean scopes 11) What if we call singleton bean from prototype or prototype bean from singleton How many objects returned. 12) what is bean life cycle in spring.