封装问题，程序没报错却无法正常输出结果，请教

下面的程序没有编码错误，但为什么无法输出结果呢/

class GoodDog {
    private int size;
    public int getSize() {
        return size;
    }
    public void setSize(int s) {
        size=s;
    }
    void bark() {
        if(size>60) {
            System.out.println("Woof!Woof");
        }else if(size>14) {
            System.out.println("Ruff!Ruff!");
        }else {
            System.out.println("Yip!Yip!");
        }
    }

}
class GoodDogTestDrive{
    public static void main(String[]args) {
        GoodDog one=new GoodDog();
        one.setSize(70);
        GoodDog two=new GoodDog();
        two.setSize(8);
        System.out.println("Dog one: "+one.getSize());
        System.out.println("Dog two: "+two.getSize());
        one.bark();
        two.bark();
    }
}