Interface – Default Method

public interface PositionType {
     
    public double hourlyWage(BigDecimal hours, BigDecimal wage);
     
    /**
     * Hourly salary calculation
     * @param wage
     * @return
     */
    default public BigDecimal yearlySalary(BigDecimal wage){
        return (wage.multiply(new BigDecimal(40))).multiply(new BigDecimal(52));
    }
}