Can you please help with these two programming questions/projects?

Q1:

Create a java program that will call a dumb method, a clever method and a smart method.

Q2:

Create a java program to demonstrate the differences between different types of access modifiers in java (public, protected, default, private

Q3:

Create a java program that will take an input from the keyboard to add, subtract, multiply and divide two numbers of type double

Thank you.