Exercise 9: Create a class called Root that contains an instance of each of the classes (that you also create) named Component1, Component2, and Component3. Derive a class Stem from Root that also contains an instance of each “component.” All classes should have default constructors that print a message about that class.
class Component1
{
Component1()
{
System.out.println("Component1()");
}
}
class Component2
{
Component2()
{
System.out.println("Component2()");
}
}
class Component3
{
Component3()
{
System.out.println("Component3()");
}
}
class Root
{
Component1 c1root;
Component2 c2root;
Component3 c3root;
Root()
{
System.out.println("Root()");
}
}
class Stem extends Root
{
Component1 c1stem;
Component2 c2stem;
Component3 c3stem;
Stem()
{
System.out.println("Stem()");
}
public static void main(String[] args)
{
Stem s = new Stem();
}
}
{
Component1()
{
System.out.println("Component1()");
}
}
class Component2
{
Component2()
{
System.out.println("Component2()");
}
}
class Component3
{
Component3()
{
System.out.println("Component3()");
}
}
class Root
{
Component1 c1root;
Component2 c2root;
Component3 c3root;
Root()
{
System.out.println("Root()");
}
}
class Stem extends Root
{
Component1 c1stem;
Component2 c2stem;
Component3 c3stem;
Stem()
{
System.out.println("Stem()");
}
public static void main(String[] args)
{
Stem s = new Stem();
}
}
Output:
