bdemo.java

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class BDemo
{
  BDemo b1 = new BDemo();  // (1)
  BDemo b2;                // (2) 
  BDemo b3;                
  
  public BDemo()
  {
    System.out.println("BDemo的构造方法!");
    b2 = new BDemo();      // (3)
  }
  
  public void test1()
  {
    b3 = new BDemo();      // (4)
  }
  
  public void test2()
  {
    BDemo b4 = new BDemo();// (5)
  }

  public BDemo test3(BDemo b5)  //(6)
  {
    return b5;
  }
}

class TestMain
{
  public static void main(String args[])
  {
    BDemo b = new BDemo();
    b.test1();
    b.test2();
    System.out.println(b.test3(new BDemo()));
  }
}