Thread: Polymorphism

My computeCommission is not working because I keep getting 0.0 instead of the actual commission value

HTML Code:

package lab4;

public abstract class Policy {
	
	public double commission;
	
	public Policy(){
		commission = 0.0;
	}

	public abstract void computeCommission();
	
	public double getCommission() 
	{
		return this.commission;
	}
	public void setCommission(double commission) 
	{
		this.commission = commission;
	}

	public String toString()
	{
		return "Commission: " + commission + "\n";
	}
	
}

HTML Code:

package lab4;

public class Auto extends Policy{
	
	String insured;
	String make;
	String model;
	double liability;
	double collision;
	
	public Auto(String insured_, String make_, String model_, double liability_, double collision_){
		super();
		insured = insured_;
		make = make_;
		model = model_;
		liability = liability_;
		collision = collision_;
	}
	public Auto(){
		super();
		insured = null;
		make = null;
		model = null;
		liability = 0.0;
		collision = 0.0;
	}
	public String getMake() {
		return make;
	}
	public void setMake(String make) {
		this.make = make;
	}
	public String getModel() {
		return model;
	}
	public void setModel(String model) {
		this.model = model;
	}
	public double getLiability() {
		return liability;
	}
	public void setLiability(double liability) {
		this.liability = liability;
	}
	public double getCollision() {
		return collision;
	}
	public void setCollision(double collision) {
		this.collision = collision;
	}
	@Override
	public void computeCommission()
	{
		commission = (liability+collision)*1.30;
	}
	public String toString(){
		String shapeString = super.toString();
		return("AUTO INSURANCE POLICY" + "\n\t" + "Policy information includes: " 
				+ "\n\tName: " + insured + "\n\tMake and Model: " + make + " " + model + "\n\tLiability: " + liability + "\n\tCollission: " + collision
				+ "\n\t" + shapeString + "\n-------------------------------------------");
	}
	public String Error(){
		return("Quit");
	}

}