Oop lab/example codes

class และ instance variables

public class Dog {
	private int weight;
	private double speed;
	private String name;
	
	Dog(String n, int w, double speed) {
		name = n;
		weight = w;
		this.speed = speed;
	}

	public void sayHello() {
		System.out.println("Hello, my name is " + name);
	}
	
	public String getName() {
		return name;
	}
	
	public double getSpeed() {
		return speed;
	}	
	
	public double runDuration(double distance) {
		return distance / speed;
	}
	
	public double weightOnMoon() {
		return ((double)(weight)) / 6.0;
	}

	public static void main(String[] args) {
		Dog d = new Dog("Dang",15, 4.5);
		
		d.sayHello();
		System.out.println("It takes " + d.getName() + 
				" " + d.runDuration(100) + 
				" seconds.");
		System.out.println("In the moon, " + d.getName() + 
				" weights " + d.weightOnMoon());
	}
}

static variables (class variables) และ static method

public class Dog {
	private int weight;
	private double speed;
	private String name;

	// ....

	static double foodPriceRate;
	
	public static double getFoodPriceRate() { return foodPriceRate; }
	public static void setFoodPriceRate(double rate) { foodPriceRate = rate; }

	public double getFoodPrice() {
		return weight * foodPriceRate;
	}
}