列表<&燃气轮机；java中的and循环

我想提醒大家，这可能看起来是一个愚蠢的问题，而且通常是一个愚蠢的问题，但我只是在学习，我已经陷入僵局了

private static ProductApi ProductApi = null;
private static AttachApi attachApi = null;
private static String productname;
private static String productId;
private static String attach;

....//output usage information for this simple

public static void main(String[] args) throws Exception {
    ... // check and save parameters

        List<Product> Products = null;
        try {
            ProductPageFilter pageFilter = PageFilterFactory.getAllRows(ProductColumn.Product_ID);
            Products = ProductApi.getProducts(pageFilter);
        } catch (SdkFault e) {
            System.err.println("getProducts() failed: " + e.getMessage());
            throw new RuntimeException(e);
        }
        if (Products == null || Products.size() == 0) {
            System.out.println("No Products assigned to user '" + username + "'");
        } else {
            for (Product Product : Products) {
                Productname = Product.getName();
                ProductId = Product.getProductId();
            }
        }
        List<AttachComponent> AttachComponents = null;
        try {
            AttachComponents = AttachApi.getAttachComponents(ProductId);
        } catch (SdkFault e) {
            System.err.println("AttachApi.getAttachComponents() failed");
            throw new RuntimeException(e);
        }
        for (AttachComponent AttachComponent : AttachComponents) {
            Attach = AttachComponent.getComponentName();
            System.out.println("ProductName: " + Productname + " ID: " + ProductId + " Attach: " + Attach);
        }
    } catch ...

我希望如此：

/ProjectName: Iphone 3gs ID: 2345hj Attach: red case
/ProjectName: Iphone 3gs ID: 2345hj Attach: blue stick
/ProjectName: Iphone 3gs ID: 2345hj Attach: white case
/ProjectName: Iphone 5S  ID: 2dhkjd Attach: green window
/ProjectName: Iphone 5S  ID: 2dhkjd Attach: fail setup
/ProjectName: Iphone 5S  ID: 2dhkjd Attach: deep scratch

---

如何处理循环？

我认为您使用的是两个循环，一个循环的输出是另一个循环的输入。 您应该使用第二个for循环转换为第一个for循环 i、 e

for（）{ for（） {
}
}

我想你应该试试这个。

你肯定想要：

    List<Product> products = null;
    try {
        ProductPageFilter pageFilter = PageFilterFactory.getAllRows(ProductColumn.Product_ID);
        products = ProductApi.getProducts(pageFilter);
    } catch (SdkFault e) {
        System.err.println("getProducts() failed: " + e.getMessage());
        throw new RuntimeException(e);
    }
    if (products == null || products.size() == 0) {
        System.out.println("No Products assigned to user '" + username + "'");
    } else {
        for (Product product : products) {
            productName = product.getName();
            productId = product.getproductId();
            List<AttachComponent> attachComponents = null;
            try {
                attachComponents = AttachApi.getAttachComponents(productId);
            } catch (SdkFault e) {
                System.err.println("AttachApi.getAttachComponents() failed");
                throw new RuntimeException(e);
            }
            for (AttachComponent attachComponent : attachComponents) {
                attach = attachComponent.getComponentName();
                System.out.println("ProductName: " + productName + " ID: " + productId + " Attach: " + attach);
            }
        }
    }

List products=null；
试一试{
ProductPageFilter pageFilter=PageFilterFactory.getAllRows（ProductColumn.Product\u ID）；
products=ProductApi.getProducts（页面过滤器）；
}捕获（SdkFault e）{
System.err.println（“getProducts（）失败：+e.getMessage（））；
抛出新的运行时异常（e）；
}
if（products==null | | products.size（）==0）{
System.out.println（“没有分配给用户的产品”“+username+”）；
}否则{
用于（产品：产品）{
productName=product.getName（）；
productId=product.getproductId（）；
List attachComponents=null；
试一试{
attachComponents=AttachApi.getAttachComponents（productId）；
}捕获（SdkFault e）{
System.err.println（“AttachApi.getAttachComponents（）失败”）；
抛出新的运行时异常（e）；
}
用于（附件组件附件组件：附件组件）{
attach=attachComponent.getComponentName（）；
System.out.println（“产品名称：+ProductName+”ID:+productId+”附加：+Attach”）；
}
}
}

---

i、 e.将第二个循环放在第一个循环中。

如果没有Arraylist生成的位置和方式的信息，那么实际上没有什么可以做的。我们缺少一些重要的代码。您是否调试以检查

列表是否确实包含您期望的内容？
    List<Product> products = null;
    try {
        ProductPageFilter pageFilter = PageFilterFactory.getAllRows(ProductColumn.Product_ID);
        products = ProductApi.getProducts(pageFilter);
    } catch (SdkFault e) {
        System.err.println("getProducts() failed: " + e.getMessage());
        throw new RuntimeException(e);
    }
    if (products == null || products.size() == 0) {
        System.out.println("No Products assigned to user '" + username + "'");
    } else {
        for (Product product : products) {
            productName = product.getName();
            productId = product.getproductId();
            List<AttachComponent> attachComponents = null;
            try {
                attachComponents = AttachApi.getAttachComponents(productId);
            } catch (SdkFault e) {
                System.err.println("AttachApi.getAttachComponents() failed");
                throw new RuntimeException(e);
            }
            for (AttachComponent attachComponent : attachComponents) {
                attach = attachComponent.getComponentName();
                System.out.println("ProductName: " + productName + " ID: " + productId + " Attach: " + attach);
            }
        }
    }