定义一个汽车类Vehicle，要求如下：[选做题] 2.1属性包括：汽车品牌brand（String类型）、颜色color（String类型）和速度speed（double类型），并且所有属性为私有。

private  String brand;
	private String color;
	private double speed=0;
	
	 Vehicle(String brand, String color) {
		this.brand = brand;
		this.color = color;
		
	}
	
	void Vehicle(String brand, String color, double speed) {
		
		this.brand = brand;
		this.color = color;
		this.speed = speed;
	}

	void run() {
		System.out.println("这个汽车的品牌为"+this.brand+"这个汽车的颜色为"+this.color+"这个汽车的速度为"+this.speed);
	}

	public static void main(String[] args) {
		Vehicle v=new Vehicle("benz","black");
		 v.run();
		
			v.Vehicle("benz", "black", 300);
			v.run();

		

	}