public class Welcome
{
   public static void main(String[] args)
   {
      Dog dog = new Dog("bush");

      System.out.println(dog.getName());
      Test(dog);
      
      System.out.println(dog.getName());
   }
   public static void Test(Dog dog){
       dog.setName("obama");
   }
}

public class Dog {
    private String Name;
    public Dog(String Name){
        this.Name = Name;
    }
    public String getName() {
        return Name;
    }
    public void setName(String name) {
        Name = name;
    }

}