Reduzir métodos

package trab13;
 
 
 
 public abstract class ArithmeticQuestion extends Question{
 	
 	protected int oper1;
 	protected int oper2;
 
 	public ArithmeticQuestion(int points){
   		super(5);
 	}
 	
 	protected static int random(int li,int ls ) {
 		return (int) Math.floor(Math.random() * (ls-li+1) +li);
 	}
 	
 	public void showQuestion() { 
 	    //nao faz nada aqui
 	}

       protected int execOper() { return 0; }
       
       public void showAnswer() { 
 		showQuestion();		
 		System.out.println( execOper() );
 	} 

 	public void reformulate() {
 		oper1 = random(1,9);
 		oper2= random(1,9);
 	}
 
 	
 	
 }

package trab13;
 
 import java.util.*;
 
 	
 
 public class AddQuestion extends ArithmeticQuestion {
 
 
 	public AddQuestion() {
 		super(5);
 	}
 
 	public void showQuestion() { 
 		System.out.print(oper1 + "+" + oper2 + " = " );		
 	}
 	
 	public int execute () {
 		showQuestion();		
 		Scanner s = new Scanner(System.in);
         	if ( s.nextInt() == execOper() ) return this.getPoints();
        		System.out.print(" R: "); showAnswer();
         	return 0;		
 	}	
 	protected int execOper() { return oper1 + oper2; }
 }

package trab13;
 import java.util.*;
 
 public class MultQuestion extends ArithmeticQuestion {
 	
 	public MultQuestion() {
 		super(5);
 	}
 
 	public int execute () {
 		showQuestion();		
 		Scanner s = new Scanner(System.in);
         	if ( s.nextInt() == execOper() ) return this.getPoints();
        		System.out.print(" R: "); showAnswer();
         	return 0;
 	}
      
 	protected int execOper() { return oper1 * oper2; }
 	
 	public void showQuestion() { 
 		System.out.print(oper1 + "*" + oper2 + " = " );		
 	}
         	
 	
 }