如何编写一个id为字符串的静态类

Question

我想编写一个以C1000开头的静态类客户ID,对于每个创建的新客户对象,它将添加+1,C1001,C1002,C1003等.如果有字符串怎么办？

public class Customer
{
    private static int customerID = 1000;

    public Customer()
    {
        customerID++;
    }

    public static int getcutomerID()
    {
        return customerID;
    }
}

Answer 1

public class Customer {
    private static int NextCustomerId = 1000;
    private final int myCustomerId;

    public Customer() {
        myCustomerId = NextCustomerId++;
        ...
    }

    public String getCustomerId() {
        return "C" + myCustomerId;
    }
}

请注意,这可能不是线程安全的.如果你需要它,请查看java.util.concurrent.atomic.AtomicInteger并使用其中一个NextCustomerId.