Java练习

class AddMoth                          
{
   private double sum;                
   AddMoth ()                        
   {
      System.out.println("构造方法!");
   }
   double add(int x, int y)          
   {
      //sum=x+y;
      return sum = x + y;              
   }
   public static void main(String args[])  
   {
      AddMoth z = new AddMoth();          
      double k=z.sum;                           //此处返回的sum，注意sum的值依旧为初始化值
      int summary = (int)z.add(7, 2);    
    
      System.out.println(summary+"和"+k);  
   }
}