defconstructor1.java

来自「java可以实现一些小程序的编写」· Java 代码 · 共 39 行

class A{
	A() //
	{System.out.println("this is class A!"); }
  	A(int i){
		System.out.println("this is class A!"+i);
    }
       
}

class B extends A{	
	B(int i,int j){
		System.out.println("this is class B!"+i);
	   }  
    B(){System.out.println("this is class B!");}
}

class C extends B{
	C(float i,int k){
		System.out.println("this is class C!"+i);
	}
    C(){System.out.println("this is class C!");}
}


class DefConstructor1
{  //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(1);
    //    System.out.println("now a had been constructed. \n");
    B b=new B(1,2);
	System.out.println("now b had been constructed. \n");
    C c=new C(3,8);
	System.out.println("now c had been constructed. \n");
   }
}

//输出结果显示：总自动调用父类的缺省构造方法