Does java have extension methods?
please send code example of inner classes?
How could Java classes direct program messages to the system console, but error messages, say to a file?
what is real-time example of runtime polymorphism and compile time polymorphism
In what circumstances, compiler will supply a default constructor for a class?
Why are pointers not secure?
What is a wrapper method?
What is the purpose of void?
How do you insert a line break?
Why java uses the concept of the string literal?
what is singleton in java?
Explain about java sdk?
Give a practical example of singleton class usage?