gistfile1.java

public abstract class StringUtils {
 
    public String cropAndConcat(String toCrop, int index, String toConcat) {
        return toCrop.substring(index) + toConcat;
    }
 
    public String removeFromAndConcatToEnd(String containing, String concat) {
        if (containing.contains(concat)) {
            return containing;
        }
 
        return concat + containing;
    }
 
    public int getDriverAge(int months) {
        return months / 12;
    }
}
 
public class Car extends StringUtils {
    private String model;
    private String make;
    private String driverName;
    private int driverAge;
 
    Car() {
        super();
    }
 
    public String getModel() {
        return removeFromAndConcatToEnd(model, "mark 2");
    }
 
    public String getMake() {
        return make;
    }
 
    public String getDriverName() {
        return driverName;
    }
  
    public int getDriverAge() {
        return getDriverAge();
    }
 
    @Override
    public boolean equals(Object that) {
        if (that == null) {
            throw new NullPointerException("that cannot be null");
        }
        if (!(that instanceof String)) {
            return false;
        }
 
        String other = (String) that;
        if (other.equals(model)) {
            return true;
        }
        return false;
    }
}