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if all user defined constructor of a class made private,can
we create an object of that class?justify your answer with
an example.
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Answer Posted / sp
Object can be created only within the same class but not in
another class (including sub class)
Eg:
// valid instantiation
public class ClassWithPrivateConstructors {
private ClassWithPrivateConstructors() {
System.out.println("object created");
}
public static void main(String args[]) {
ClassWithPrivateConstructors t = new
ClassWithPrivateConstructors();
}
}
//invalid instantiation - subclass
public class SubClassWithPrivateConstructors extends
ClassWithPrivateConstructors {
public NewClassConstructorTest(String name) {
//implicitly super() constructor in super
class is invoked.
System.out.println("New sub class object created" + name);
}
}
//invalid instantiation - reference class
public class ClassWithPrivateConstructorsTest {
public ClassWithPrivateConstructorsTest() {
ClassWithPrivateConstructors c = new
ClassWithPrivateConstructors();
}
}
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