Java Constructor Online Test – 1

1. Which operator is used by Java run time implementations to free the memory of an object when it is no longer needed?

2. Which of the following is a method having same name as that of its class?

3. What will be the output of the following Java code?

    class box 
    {
        int width;
        int height;
        int length;
        int volume;
        box() 
        {
            width = 5;
            height = 5;
            length = 6;
        }
        void volume() 
        {
             volume = width*height*length;
        } 
    }    
    class constructor_output 
    {
        public static void main(String args[])
        {
            box obj = new box();
            obj.volume();
            System.out.println(obj.volume);
        }
   }

4. What is the return type of Constructors?

5. What will be the output of the following Java code?

class San
{
     San()throws IOException
     {
  
     } 
 
}
class Foundry extends San
{
     Foundry()
     {

     }
     public static void main(String[]args)
     {
  
     }
}

6. What will be the output of the following Java code?

    class area 
    {
        int width;
        int length;
        int area;
        void area(int width, int length) 
        {
            this.width = width;
            this.length = length;
        }
                 
    }    
    class Output 
    {
        public static void main(String args[])
        {
            area obj = new area();
            obj.area(5 , 6);
            System.out.println(obj.length + " " + obj.width);        
        } 
    }

7. What will be the output of the following Java code?

    class box 
    {
        int width;
        int height;
        int length;
        int volume;
        void finalize() 
        {
            volume = width*height*length;
            System.out.println(volume);
        }
        protected void volume() 
       {
            volume = width*height*length;
            System.out.println(volume);
       } 
    }    
    class Output 
    { 
        public static void main(String args[])
        {
            box obj = new box();
            obj.width=5;
            obj.height=5;
            obj.length=6;
            obj.volume();
        } 
    }

8. Which of the following statements are incorrect?

9. Which keyword is used by the method to refer to the object that invoked it?

10. Which function is used to perform some action when the object is to be destroyed?