实验六 类的封装

class Manager{
    Manager(){ System.out.println("Manager"); }
}
public class ATM{    
    static Manager m;
    ATM(){ 
        m = new Manager();
        System.out.println("ATM");
    }
    public static void main (String[] args) {
        //Customer cus = new Customer();
        new ATM();  new ATM();    new ATM();        
    }
}

package bank;
public class Customer{
    String account;
    private double balance = 0;
    Customer(){}
}

package bank.sys;
import bank.Customer;//导入
public class ATM{
    public static void main (String[] args) {
        Customer cus = new Customer();
    }
}

package bank;
class Customer{
    String account;                       
    protected String cname;         
    private double balance;            
    public void quKuan(){}            
    public void cunKuan(){}
}