publicstaticString join(Collection s, String delimiter) { StringBuffer buffer=newStringBuffer(); Iterator iter=s.iterator(); while(iter.hasNext()) { buffer.append(iter.next()); if(iter.hasNext()) { buffer.append(delimiter); } } returnbuffer.toString(); } 如果把if移出循环的话,效率会有所...
AI代码解释 mysql>select*from grade;+---+---+---+---+|id|sno|courseName|grade|+---+---+---+---+|1|202001|高数一|90||2|202003|高数二|88||3|202003|英语一|77||4|202004|英语二|79||5|202002|C++语言设计|87||6|202005|Java面向对象基础|98||7|202006|算法分析与实现|76||8|2...
$userIds = implode(',', array_column($orders, 'user_id')); // 获取订单中的用户id $result = $mysqli->query("select `id`,`name` from `user` where id in ({$userIds})"); $users = $result->fetch_all(MYSQLI_ASSOC);// 获取这些用户的姓名 // 将id做数组键 $userRes = []; f...
It then shows the rich primitives added by the java.util.concurrent packages before presenting fork/join tasks, an essential addition provided in Java SE 7 by the fork/join framework. An example usage of the new APIs is given. Finally, a discussion on the approach precedes the conclusion. ...
list join函数java join(list()) 在Python2中map函数会返回一个list列表,但在Python3中,返回 map() 会根据提供的函数对指定序列做映射。第一个参数 function 以参数序列中的每一个元素调用 function 函数,得到包含每次 function 函数返回值的新列表,返回一个将 function 应用 list join函数java 字符串 列表 ...
*/ OUT join(IN1 first, IN2 second) throws Exception; } JoinFunction继承了Function、Serializable,它定义了join操作,默认是inner join的语义,如果需要outer join,可以使用CoGroupFunction FlatJoinFunction flink-core-1.7.0-sources.jar!/org/apache/flink/api/common/functions/FlatJoinFunction.java 代码语言:...
list join函数java join(list()) 在Python2中map函数会返回一个list列表,但在Python3中,返回 map() 会根据提供的函数对指定序列做映射。 第一个参数 function 以参数序列中的每一个元素调用 function 函数,得到包含每次 function 函数返回值的新列表,返回一个将function应用于iterable中每一项并输出其结果的迭代...
packagejoin;importcom.google.common.cache.*;importorg.apache.flink.api.common.functions.RichMapFunction;importorg.apache.flink.api.common.typeinfo.TypeHint;importorg.apache.flink.api.java.tuple.Tuple2;importorg.apache.flink.api.java.tuple.Tuple3;importorg.apache.flink.configuration.Configuration;import...
protectedRouteFunction<String>getRouteFilter(TableAvailable table, Object shardingValue, ShardingOperatorEnum shardingOperator,booleanwithEntity){ LocalDateTime createTime = (LocalDateTime) shardingValue; String dataSource ="ds"+ createTime.getYear();switch(shardingOperator){caseGREATER_THAN:caseGREATER_THAN_...
In the most typical usages, a fork-join pair act like a call (fork) and return (join) from a parallel recursive function. As is the case with other forms of recursive calls, returns (joins) should be performed innermost-first. For example,a.fork(); b.fork(); b.join(); a.join()...