Programmer Group

Part II C + + standard library The core of the standard library is many container classes and a family of generic algorithms. These facilities can help us write concise and efficient programs. The standard library will pay attention to the details of bookkeeping operations, especially memory management, so that our programs can devote all thei ...

1. Obtain Kafka download Latest version, unzip $ tar -xzf kafka_2.13-3.0.0.tgz $ cd kafka_2.13-3.0.0 2. Start Kafka environment Run the following command in order to start the services correctly in order # Start the ZooKeeper service # Note: Soon, ZooKeeper will no longer be required by Apache Kafka. $ bin/zookeeper-server-start.sh co ...

Java source code reading notes - stream Why learn stream In Java programming, ArrayList is estimated to be one of the most commonly used classes, which is used as an array in daily life. For array operations, traversal, data filtering, data modification and other operations will be involved. The simplest of these operations is for loop traver ...

Operation steps of Stream 1. Create a Stream Get a stream through a data source (such as a collection or array) 2. Intermediate operation Intermediate operation chain: operate the data of the data source 3. Terminate the operation Execute the intermediate operation chain and produce results Create Stream 1. You can use the stream() or pa ...

First post a few cases. Students with high level can challenge: Select employees with salary greater than 8000 from the employee set and place them in a new set.Count the sum of the maximum salary, average salary and salary of employees.Employees are ranked from high to low in salary, and the younger ones are the first.Classify employees by ...