Java抽象类不可创建对象，但可以调用静态方法将建一个对象

Java抽象类不可创建对象，但可以调用静态方法将建一个对象，利用多态创建子类对象上转成父类类型。

附代码：

public abstract class Dog {
private int age;
private String sex;
private String name;

public int getAge() {
return age;
}

public void setAge(int age) {
this.age = age;
}

public String getSex() {
return sex;
}

public void setSex(String sex) {
this.sex = sex;
}

public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}

public Dog(int age, String sex, String name) {
super();
this.age = age;
this.sex = sex;
this.name = name;
}

public Dog() {
super();
// TODO Auto-generated constructor stub
}

public void eat() {
System.out.println(name + "吃骨头");
}

public abstract void shout();

public static Dog getinstance() {
Dog dog = new Teddy();
return dog;
}

public static Dog getinstance(int age, String sex, String name) {
Dog dog = new Teddy(age, sex, name);
return dog;
}

}

public class Teddy extends Dog {

public Teddy() {
super();
// TODO Auto-generated constructor stub
}

public Teddy(int age, String sex, String name) {
super(age, sex, name);
// TODO Auto-generated constructor stub
}

@Override
public void shout() {
System.out.println(getName() + "汪汪汪");

}

}

public class NewAbstract {
public static void main(String[] args) {
Dog dog=Dog.getinstance(2,"男","旺财");
dog.eat();
dog.shout();
}

}