Guess output of this java code ...

Question

public class Test {

public void foo(String s) {
System.out.println("String");
}

public void foo(StringBuffer sb){
System.out.println("StringBuffer");
}

public static void main(String[] args) {
new Test().foo(null);
}

}

Answer 1

u need to declar a static method
for ex: public static void foo(...){...}
and in the main function u need to create:
Test.foo(null); // class Test static
or creat a varibale before new Test()
Test t=new test();
t.foo();

Answer 2

It's an error

Answer 3

That's not the problem, try in playground.