defconstructor.java

java可以实现一些小程序的编写

class A{
  	A(){
		System.out.println("this is class A!");
	    }
}

class B extends A{	
	B(){
		System.out.println("this is class B!");
	   }
}

class C extends B{
	C(){
		System.out.println("this is class C!");
	    }
}


class DefConstructor
{  //演示缺省构造方法的调用次序,注意是指不带参数的构造方法。
   public static void main(String args[])
   {
	A a=new A();
        System.out.println("now a had constructed. ------------\n");
        B b=new B();
	System.out.println("now b had constructed. ----\n");
        C c=new C();
	System.out.println("now c had constructed.- \n");
   }
}