Java 8 – Streams

by

Introduction In the first article we learned about Lambdas, functional interfaces and method references introduced in Java 8. In the previous article we saw some of the new methods added in the Collections hierarchy. In this article we look at what is probably the most important addition to Java since generics – Streams. Streams make … Read more

Java 8 – New methods in Collections

by

Introduction In the first article we learned about Lambdas, functional interfaces and method references introduced in Java 8. In the previous article we saw default methods in interfaces and their inheritance rules. In this article we look at the new default methods added in the Collections hierarchy. Many of the new methods make use of … Read more

Java 8 – Default Methods, inheritance

by

Default Methods In the previous article we learned about functional programming using lambdas introduced in java8. We also learned about functional interfaces and method references. In this tutorial we will look at a side effect in Java8 – Default methods. The designers in Java always strive for backward compatibility, and so to add methods to … Read more

Java 8 – Lambdas, Method References and Composition

by

Introduction The introduction of functional programming in Java8 has caused quite a buzz amongst java enthusiasts. It is probably the biggest change in Java since the introduction of generics. Java has lacked this feature which has been quite popular in other languages such as Lisp, Clojure, Haskell, R etc. In this slightly length..ish tutorial we … Read more

Java IO vs Java NIO

by

IO vs NIO tabular comparison Topic IO NIO Reading/Writing Provides classes to read and write bytes and characters from files and sockets. The reading and writing can be buffered. Easy to use. Provides channels that interface with files or sockets to manage data. There is no specific advantage to using NIO over IO. Large Files … Read more

Java IO – Pipes And Print Writer Next

by

Read from Console using pipes We see the use of a buffered reader and writer and a piped reader and writer. The example also demonstrates how to read from a console continuously. The example reads from a console using a buffered reader, passes the characters to a piped writer. A piped reader reads the characters … Read more

Java NIO – Channels and Memory mapping

by

Channel Classes Channel– A channel represents a connection to a file, socket or any other component that can perform IO operations. A channel reads or writes data to a byte buffer. Channels are generally thread safe. A channel may be specified to be read only or both readable and writable. ReadableByteChannel – A ReadableByteChannel permits … Read more

Java IO – RandomAccessFiles

by

Introduction A Random access file behaves like an array of bytes. It can be used to both read and write bytes. RandomAccessFile allows to read or write data at a particular position. It implements the DataInput and DataOutput interfaces and hence allows reading and writing java primitive types. The file can be opened in both … Read more

Java IO – Read and Write Java Objects

by

Introduction ObjectInputStream can be used to de-serialize and read java objects that have been serialized and written using ObjectOutputStream. In the example below the ‘Course’ object is written to a persistent storage. The Course object contains a list of Student objects. The object writing preserves object references. We first create an object output stream that … Read more

Java IO – Read and write text files

by

Reading Character Streams – Classes All classes that read character stream extend java.io.Reader. The important classes are: InputStreamReader-This class reads bytes from an underlying stream and converts it to characters using a Charset. It acts as a bridge between a byte stream and character stream PipedReader- This class connects to a PipedWriter and reads characters … Read more