Answer 1

class program{
Object obj = new Object();
//You can use any object type you want
//If you want to create an object variable of class,that is not at the same package, you should import this another package!
//You can even do something like this to make a reference variable of exact the same class
program prg = new program();
//You could make a reference to the current object!
program object_variable = this;
}