hw9_10.java

JAVA 2面向对象程序设计(习题参考答案9-17).rar

//9-10
class Caaa
{
   protected int num1,num2;
   public Caaa()  //构造函数，设置num1，num2初值为1
   {
      num1=1;
      num2=1;
   }
}

class Cbbb extends Caaa
{
   public Cbbb()
   {
      super(); //用super关键词来调用父类构造函数。
   }
   public Cbbb(int a,int b)
   {
      num1=a; //构造函数,设置num1,num2初值各为a,b
      num2=b;
   }
   void show()
   {
      System.out.println("num1="+num1+" ,num2="+num2);
   }
}

class hw9_10
{
   public static void main(String args[])
   {

      Cbbb bb=new Cbbb();
      bb.show();
   }
}