Job Class

package system.domain;

public class Job {
    private final int MAX_TIME = 10;
    private int jobId;
    private int startTime;
    private int finishTime;
    private int duration;
    private int profit;

    public Job() {
    }

    public Job(int jobId, int startTime, int finishTime, int profit) {
        if (startTime < 0 || finishTime < 0) {
            throw new TimeConstraintException("Start Time and Finish Time must be positive number");
        }
        else if (startTime > MAX_TIME || finishTime > MAX_TIME) {
            throw new TimeConstraintException("Start Time and Finish Time must less than 10 unit of time");
        }
        else if (startTime >= finishTime) {
            throw new TimeConstraintException("Start Time is larger than or equal to Finish Time");
        }
        else if (profit < 0) {
            throw new ProfitNegativeException("Profit must be positive number");
        }
        else {
            this.jobId = jobId;
            this.startTime = startTime;
            this.finishTime = finishTime;
            this.setDuration();
            this.profit = profit;
        }
    }

    public int getJobId() {
        return this.jobId;
    }

    public boolean setJobId(int jobId) {
        this.jobId = jobId;
        return true;
    }

    public int getStartTime() {
        return this.startTime;
    }

    public boolean setStartTime(int startTime) {
        if (startTime < 0) {
            throw new TimeConstraintException("Start Time and Finish Time must be positive number");
        }
        else if (startTime > MAX_TIME) {
            throw new TimeConstraintException("Start Time and Finish Time must less than 10 unit of time");
        }
        else if (startTime > this.finishTime) {
            throw new TimeConstraintException("Start Time is larger than Finish Time");
        }
        else {
            this.startTime = startTime;
            return true;
        }
    }

    public int getFinishTime() {
        return this.finishTime;
    }

    public boolean setFinishTime(int finishTime) {
        if (finishTime < 0) {
            throw new TimeConstraintException("Start Time and Finish Time must be positive number");
        }
        else if (finishTime > MAX_TIME) {
            throw new TimeConstraintException("Start Time and Finish Time must less than 10 unit of time");
        }
        else if (this.startTime > finishTime) {
            throw new TimeConstraintException("Start Time is larger than Finish Time");
        }
        else {
            this.finishTime = finishTime;
            return true;
        }
    }

    public int getDuration() {
        return this.duration;
    }

    private boolean setDuration() {
        this.duration = this.finishTime - this.startTime;
        return true;
    }

    public int getProfit() {
        return this.profit;
    }

    public boolean setProfit (int profit) {
        if (profit < 0) {
            throw new ProfitNegativeException("Profit must be positive number");
        }
        else {
            this.profit = profit;
            return true;
        }
    }

    public String toString() {
        return Integer.toString(this.jobId) + " " +
                Integer.toString(this.startTime) + " " +
                Integer.toString(this.finishTime) + " " +
                Integer.toString(this.profit);
    }

}