How to implement LongToDoubleFunction using lambda and method reference in Java?

raja
Published on 27-Jan-2020 13:38:26
LongToDoubleFunction is a built-in functional interface and part of java.util.function package. This functional interface accepts a long-valued parameter as input and produces a double-valued result. LongToDoubleFunction can be used as an assignment target for a lambda expression or method reference. It contains only one abstract method: applyAsDouble().Syntax@FunctionalInterface interface LongToDoubleFunction { ... Read More

How to implement LongToIntFunction using lambda and method reference in Java?

raja
Published on 27-Jan-2020 12:59:00
LongToIntFunction is a functional interface from java.util.function package introduced in Java 8. This functional interface accepts a long-valued parameter as input and produces an int-valued result. LongToIntFunction interface can be used as an assignment target for a lambda expression or method reference. This interface contains only one abstract method: applyAsInt() and ... Read More

Difference between Data warehouse and Operational database

Mahesh Parahar
Published on 27-Jan-2020 10:54:00
A data warehouse is a repository for structured, filtered data that has already been processed for a specific purpose. Dataware collect the data from multiple sources and transform the data using ETL process then load it to the Data Warehouse for business purpose.Operational Database are those databases where data changes ... Read More

Difference between Apache Kafka and Flume

Mahesh Parahar
Published on 27-Jan-2020 10:50:55
Kafka and Flume both are used for real time event processing system. They both are developed by Apache. Kafka is a publish-subscribe model messaging system. It can be used to communicate between publisher and subscriber using topic. One of the best features of Kafka is, it is highly available and ... Read More

Difference between Apache Kafka and Kinesis

Mahesh Parahar
Published on 27-Jan-2020 10:49:06
Apache Kafka and Kinesis both software tool is to processing data stream in real time. Apache kafka is developed by linked-in and it is written in Scala and java. Kinesis is developed and managed by Amazon. It can be only used as a services.According to the amazon documentation −Amazon Kinesis ... Read More

Difference between Data lake and Datawarehouse

Mahesh Parahar
Published on 27-Jan-2020 10:46:49
Data lake and Data warehouse both are used for storing big data.Data lake is very big storage repository which is used to store raw unstructured data, machine to machine, logs flowing through in real-time. Purpose of the stored data is not defined in the data lake. They are stored for ... Read More

Difference between Primary key and Foreign key in Database

Mahesh Parahar
Published on 27-Jan-2020 10:42:23
In the relationaltonal database key is the most important element to maintain the relationship between two tables or to uniquely identify data from the table. Primary key is used to identify data uniquely therefore two rows can’t have the same primary key. It can’t be null.On the other hand, foreign ... Read More

Difference between OLAP and OLTP

Mahesh Parahar
Published on 27-Jan-2020 10:38:41
OLAP  stands for On-Line Analytical Processing. It is used for analysis of database information from multiple database systems at one time such as sales analysis and forecasting, market research, budgeting and etc. Data Warehouse is the example of OLAP system.OLTP stands for On-Line Transactional processing. It is used for maintaining ... Read More

Difference between monolithic and microservices architecture

Mahesh Parahar
Published on 27-Jan-2020 10:36:09
Monolithic architecture  is built as one large system and is usually one code-base. Monolithic application is tightly coupled and entangled as the application evolves, making it difficult to isolate services for purposes such as independent scaling or code maintainability.It extremely difficult to change technology or language or framework because everything ... Read More

Difference between ArrayBlockingQueue and ArrayDeque

Mahesh Parahar
Published on 27-Jan-2020 10:33:44
ArrayBlockingQueue stores elements in FIFO order. Insertion of element always happened at the tail of the queue and removal of the element always happened from the head of the queue.  It is thread safe and It is bounded array queue therefore once created, the capacity cannot be changed. It is ... Read More
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