public?abstract?class?AbstractUser?{
public?abstract?void?See();
}
public?class?RegisteredUser?extends?AbstractUser?{
	public?void?See(){
		System.out.println("注冊用戶");
	}
	public?void?Micronesia(){
		System.out.println("修改自己信息");
	};
	public?void?Modifypost(){
		System.out.println("修改自己帖子");
	}
	public?class?Tourist?extends?AbstractUser?{
private?AbstractUser?abstractUser;

public?void?setAbstractUser(AbstractUser?abstractUser)?{
	this.abstractUser?=?abstractUser;
}

@Override
public?void?See()?{
	System.out.println("我是游客");
	abstractUser.See();
}
}