BloodData.java

public class BloodData {

    private String type;
    private String rH;

    // Overloaded constructor
    // this consturctor calls the parametrized constructor
    public BloodData() {
        this("O", "+");
    }

    public BloodData(String type, String rH) {
        this.type = type;
        this.rH = rH;
    }

    public String getType() {
        return type; // or return this.type;
    }

    public String getRH() {
        return rH; // or return this.rH;
    }

    public void setType(String type) {
        this.type = type;
    }

    public void setrH(String rH) {
        this.rH = rH;
    }

    @Override
    public String toString() {
        return "Your blood type is " + type + ", and your RH is " + rH + ".";
    }
}