Question

This is in Java,

Put data into array(s) for stock trades and a combination of abstract classes AND concrete classes should be set up in your code. You can set it up so the arrays are already populated.

Any of the variables/integers can be 100% made up. This should be in very basic code.

The stock trade data can be anything.. it doesn't even need to be stock trade, it can be anything. Just need to have the abstract classes / concrete classes demonstrated.

Answer 1

The following classes demonstrate the abstract and base classes. I created three classes, one Base class which is abstract, one derived class which implements the method of abstract class and a tester class which creates object of derived class and tests whole program. Let me know in case of any confusion

************************Abstract_Base.java*******************************

//This is the abstract class
// which can only be derived but not
//instantiated
import java.util.*;

public abstract class Abstract_Base {
   int n=5;
   ArrayList<String> stock_markets = new ArrayList<String>(n);
   ArrayList<Double> current_value = new ArrayList<Double>(n);
   public Abstract_Base() {
       stock_markets.add("NASDAQ");
       stock_markets.add("FTSE");
       stock_markets.add("CAC");
       stock_markets.add("DAX");
       stock_markets.add("NIFTY");
      
       current_value.add(7034.69);
       current_value.add(6862.68);
       current_value.add(4810.84);
       current_value.add(10931.24);
       current_value.add(10931.50);
      
      
   }
   //Following is the abstract method which
   //needs to be implemented in derived class
   abstract void printMarketValue();
}

************************Derived.java******************************

//This class extends the abstract class
//and implements the abstract methods

//this is concrete class
public class Derived extends Abstract_Base {
public Derived() {
   System.out.println("Markets created");
}
//implementing the printMarketValue function
// of the abstract Base class
public void printMarketValue(){
   for (int i=0; i<this.n; i++) {
System.out.print(this.stock_markets.get(i)+" - "+this.current_value.get(i));
System.out.print(" ");
   }
}
}

*******************Tester.java************************************

//This class creates actual objects
//and tests the whole program
public class Tester {

   public static void main(String[] args) {
       Derived derived= new Derived();
       System.out.println("Market Value");
       derived.printMarketValue();

   }

}