我的代码有什么问题? [英] what is wrong with my code ?

问题描述

    public class AccumulateSavingsBatch {
    private Bank bank;
    public void setBank(Bank bank)
    {
        this.bank=bank;
    }
    public void doBatch()
    {
        for (Customer c : bank)
        {
            for (Account a : c)
            {
                if(a instanceof SavingAccount)
                {
                    a.accumulateIntersest();
                }
            }
        }
    }
}

foreach不适用于表达式类型，客户和帐户y会出现此错误?

foreach not applicable to expression type this error appears with customer and account y??

推荐答案

您的客户和银行类应实现IEnumerable< t>接口.

对于实现IEnumerable，IEnumerable< t，IList，IList< t>的类的每个作品.等等.

Your Customer and Bank Classes Should Implement the interface IEnumerable<t>.

For each works with the class which implements IEnumerable, IEnumerable<t>, IList, IList<t> etc.

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