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Thread: Programming assignment using inheritance

  1. #1
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    Default Programming assignment using inheritance

    I am writing a java program focusing on inheritance. The super class reads in a file and I tokenize the line and send each token into its own array. There are 7 arrays with 9 slots in each one (because there are 9 lines of information and 6 tokens per line). I have to make a sub class extending from the super class, and I am having problems with my super class constructor and how the sub class will be able to access the information in any of the slots of any of the arrays. I understand the basic concept of inheritance, but am having trouble comprehending how to put arrays as parameters in the constructor and how the subclass will access those values.

    //Super Class constructor
     
    public Employee(String employFirstNames[], String employLastNames[], String employNumbers[], String employHireDates[], String employShiftNumbers[], String employHourlyRates[])
          {		
    			for(i = 0; i < employees.length(); i++)
    			{
             	                empFirstNames[] = employFirstNames[];
     
    				empLastName[] = employLastNames[];
     
    				empNumbers[] = employNumbers[];
     
    			 	empHireDates[] = employHireDates[];
     
    				empShiftNumbers[] = employShiftNumbers[];
     
    				empHourlyRates[] = employHourlyRates[];
    			}
          }
     
    //sub class constructor
     
    public ProWorker()
    	{
    		super(empFirstNames[], empLastNames[], empNumbers[], empHireDates[], empShiftNumbers[], empHourlyRates[]);
    	}
    Last edited by helloworld922; May 3rd, 2011 at 09:06 PM.


  2. #2
    Administrator copeg's Avatar
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    Default Re: Programming assignment using inheritance

    The subclass constructor does not have any parameters, so based upon the info you provided cannot invoke the super class constructor. You can adapt the child class constructor to accept parameters and pass those to the parent class, or provide setters for those values which can be used to set the values, or access them directly if the child class has access. The first suggestion is demonstrated below:
    public class Parent{
        private String[] values;
        public Parent(String[] values ){
            this.values = values;
        }
    }
     
    public class Child extends Parent{
        public Child(String[] values){
            super(values);
        }
    }

  3. The Following User Says Thank You to copeg For This Useful Post:

    javapenguin (May 3rd, 2011)

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    Default

    Thank you.

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