1.We can prevent object creation from outsider class when we have only Private Constructor(s). 2. Create an instance of non static's method's class and invoke nonstatic method

1.We can prevent object creation from outsider class when we have only Private Constructor(s). 2. Create an instance of non static's method's class and invoke nonstatic method

Yes

you can call non-static method from static method. See example public class MyClass {private void data1(){}private static void data2(){MyClass c = new MyClass();c.data1();} }

Not Possible.Class cannot have private constructor and static class cannot have non static method.