?? owner.java
字號:
class Owner{
private Dog dog;
public Dog getdog(){return dog;}
public void setDog(Dog dog){
this.dog=dog;
}
}
class Dog{
private Owner owner;
public Owner getOwner(){return owner;
}
public void setOwner(Owner owner){
if(this.owner!=null)
{this.owner.setDog(null);}
this.owner=owner;
owner.setDog(this);
}
public static void main(String arg[])
{
Owner owner1=new Owner();
Owner owner2=new Owner();
Dog dog1=new Dog();
dog1.setOwner(owner1);
// dog2.setOwner(owner2);
}
}
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