引用

```java
public class oopPet {
public String name;
public int age;

public void shout(){
System.out.println("别叫了");
}
}

public class oopDemo8 {
public static void main(String[] args) {

oopPet oopPet = new oopPet();

oopPet.name = "小罗";
oopPet.age = 3;
oopPet.shout();

System.out.println(oopPet.name);
System.out.println(oopPet.age);

oopPet cat = new oopPet();

cat.name = "cojob";
cat.age = 1;
cat.shout();

System.out.println(cat.name);
System.out.println(cat.age);

}
}