ademo.java

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//例:聚合和依赖中各个类的构造次序
class A
{
  String name;
  public A(String s)
  {
    name=s;
    System.out.println("构造类[A],对象["+this+"]");
  }
  public String toString()
  {
    return name;
  }
}
class B
{
  String name;
  public B(String s)
  {
    name=s;
    System.out.println("构造类[B],对象["+this+"]");
  }
  public String toString()
  {
    return name;
  }
}
class ADemo
{
  A a1 = new A("a1");
  B b1;
  
  public ADemo()
  {
    System.out.println("构造类[ADemo],对象["+this+"]");
    A a2 = new A("a2");
  }
  public void test1()
  {
    System.out.println("test1方法内部!");
    b1 = new B("b1");
  }
  public void test2(B b2)
  {
    System.out.println("test2方法内部!");
    System.out.println("b2引用对象["+b2+"]!");
  }
}

class TestMain
{
  public static void main(String args[])
  {
    ADemo ad1 = new ADemo();
    ad1.test1();
    B b3 = new B("b3");
    System.out.println("b3引用对象["+b3+"]!");
    ad1.test2(b3);
  }
}