커피 한 잔의 JAVA : 캡슐화 그리고 setter와 getter_part.2

package Section8_12;

public class MotorBike {

	private int speed;
	public int sPeed;

	void setSpeed(int speed) {
		if (speed > 0)
			this.speed = speed;
//		System.out.println(speed);
//		System.out.println(this.speed);
	}

	int getSpeed() {
		return this.speed;
	}

	public int increaseSpeed(int howMuch) {
		setSpeed(this.speed + howMuch);
		return this.speed;
	}

	public int decreaseSpeed(int howMuch) {
		setSpeed(this.speed - howMuch);
		return this.speed;
	}

	public void start() {
		System.out.println("Bike Started!!");

	}
}