What is immutability in java, how internally is it achieved in java?

There are two arrays named Pushed and Popped. You have tell if the Popped sequence can be a valid sequence for provided Pushed sequence in a stack e.g. Pushed=[2,4,1,3,5] and Popped=[4,3,5,1,2] is valid but Popped=[3,1,5,2,4] is not. We can pop at any stage after adding certain elements to stack.

What is SCP in java?

Can static methods be overridden, if yes, which method will be called when an object of child class accesses this method? Child c1 = new Child(); c1.staticMethod(); Parent c2= new Child(); c2.staticMethod();

Difference between Binary and Binary Search Tree.

What are the challenges of microservices and in what scenario would you prefer microservices over monoliths?

When do you get less latency, accessing services through microservices or using monoliths?

What is the default scope in spring boot and why?

How to create a singleton class in java?

What are fail fast and fail safe iterators?

What are optimistic and pessimistic locking?

What all design patterns are you aware of? What is saga pattern?

What are functional interfaces in java?

What is stated in CAP theorem?

When do you use Callable?

There are three method definitions in class MyClass: public void callMe(String s) {} public void callMe(Integer i) {} public void callMe(Double d) {} What is the output of the following? MyClass m= new MyClass(); m.callMe(null);

What is predicate in java?