for (Warehousing warehousing : whList) { if(warehousing.getIfDefault() == 1 && warehousing.getWhType().equals("A")){ return warehousing; } } for (Warehousing warehousing : whList) { if(warehousing.getIfDefault() == 1 && warehousing.getWhType().equals("C")){ return warehousing; } }
时间: 2023-05-26 19:01:11 浏览: 65
){ return warehousing; } } return null;
这段代码是什么意思?
A:这段代码是一个 foreach 循环语句,用于遍历一个 List 集合中的 Warehousing 类型对象,找到其中 IfDefault 属性值为 1 的对象并返回。如果没有找到满足条件的对象,则返回 null。
相关问题
Caused by: java.lang.ClassNotFoundException: org.apache.hadoop.hive.metastore.IMetaStoreClient
This error message indicates that the Java class "org.apache.hadoop.hive.metastore.IMetaStoreClient" could not be found. This class is part of the Apache Hive project, which provides data warehousing and SQL-like query capabilities on top of Hadoop.
There could be several reasons why this class is not found:
1. The required JAR file containing this class is not in the classpath. You should check if the JAR file containing the Hive libraries is included in the classpath.
2. The version of the Hive libraries in the classpath may be incompatible with the version of the Hive server you are connecting to. You should make sure that the version of the Hive libraries in the classpath matches the version of the Hive server.
3. The Hive server may not be running or may not be accessible. You should verify that the Hive server is running and that you have the correct connection parameters.
To resolve this issue, you should try to identify the root cause of the problem and take appropriate action. This may involve adding the required JAR files to the classpath, upgrading or downgrading the Hive libraries, or verifying the connectivity to the Hive server.
int xu = in.nextInt(); switch (xu) { case 1: // 调用入库方法 Warehousing(array); break; case 2: // 调用显示方法 display(array); break; case 3: // 调用删除方法 delete(array); break; case 4: System.out.println("欢迎下次使用!"); System.exit(0); // JVM退出 default: System.out.println("请输入正确的序号!"); }
这是上面提到的Interface方法中的一段代码。它根据用户输入的功能序号(xu)来执行相应的操作。使用switch语句来判断用户输入的序号,如果是1,则调用Warehousing方法来进行商品入库操作;如果是2,则调用display方法来进行商品显示操作;如果是3,则调用delete方法来进行删除商品操作;如果是4,则打印“欢迎下次使用!”的消息,然后使用System.exit(0)退出JVM。如果用户输入的序号不是1、2、3或4,则打印“请输入正确的序号!”的消息。
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