cdemo.java

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class A
{
  public A()
  {
    System.out.println("构造类[A],对象["+this+"]");
  }
}
class B
{
  public B()
  {
    System.out.println("构造类[B],对象["+this+"]");
  }
}
class X
{
  public X()
  {
    System.out.println("构造类[X],对象["+this+"]");
  }
}
class Y extends X
{
  A a1 = new A();
  public Y()
  {
    System.out.println("构造类[Y],对象["+this+"]");
  }
}
class Z extends Y
{
  B b1 = new B();
  public Z()
  {
    System.out.println("构造类[Z],对象["+this+"]");
  }
}

class TestMain
{
  public static void main(String args[])
  {
    new Z();
  }
}