Question

I’m working on an exercise for my course and I’ve stumbled upon a problem through the coding. I’m supposed to make an extended class and I think the problem I’m having is the parameter I’m giving for the constructor.

Here is the direct superclass:

public class ElectricalComponent extends Component 
{ 
  private int myMinRating, 
              myMaxRating; 
      
  public ElectricalComponent( String partNumber, int versionNumber, int minRating, int maxRating ) 
  { 
    super( "Electrical", partNumber, versionNumber ); 
    myMinRating = minRating; 
    myMaxRating = maxRating; 
  } 

  public int getMinRating() { return myMinRating; } 
  public int getMaxRating() { return myMaxRating; } 
}

And here is the class I’m working on:

public class HighvoltageComponent extends ElectricalComponent
{
  private int myMinRating, myMaxRating;

  public HighvoltageComponent( String partNumber, int versionNumber)
  {
    super( "Electrical", partNumber, versionNumber );
    myMinRating = 50000;
    myMaxRating = 200000;
  }

}

My problem is in the subclass where it says : "HighvoltageComponent ( String … ) "

When I run the main class which is

public static void main( String[] args )
{
  // test your code here
  Component a = new HighvoltageComponent( "HV12", 0 );

  System.out.println( a.toString() );
  System.out.println( a.getTypeName() );
  System.out.println( a.getPartNumber() );
  System.out.println( a.getVersionNumber() );
}

I get the error that says

"HighvoltageComponent.java:9: cannot find symbol

symbol : constructor ElectricalComponent(java.lang.String,java.lang.String,int) "

Why is this happening?

Also, could you please tell me if I’m doing this question the right way? This is the question:

A HighvoltageComponent is an ElectricalComponent with a minimum rating of 50000 and a maximum rating of 200000. Complete the following definition of HighvoltageComponent. (You will need to insert code at more than one place in the code area below.)

Thanks, Rohan

Answer 1

ElectricalComponent constructor requires four parameters, you passed only three params in call super( "Electrical", partNumber, versionNumber ); in HighvoltageComponent class

You super call should be something like this

super( partNumber, versionNumber,myMinRating ,myMaxRating );