Java 8 Stream – Read a file line by line
In Java 8, you can use Files.lines to read file as Stream. A new method lines() has been added since 1.8, it lets BufferedReader returns content as Stream.
Java 8 flatMap example
This article explains the Java 8 Stream.flatMap and how to use it. In Java 8, we can use the flatMap to convert the above 2 levels Stream into one Stream…
Java – Convert File to Hex
This article shows how to convert a file into a hexadecimal (hex) representative format. The idea is to read the file into an InputStream and uses String.format(%X) to convert each…
Java – How to save byte[] to a file
This article shows a few ways to save a byte into a file. For JDK 1.7 and above, the NIO Files.write is the simplest solution to save byte to a…
Java – How to convert File to byte[]
In Java, we can use Files.readAllBytes(path) to convert a File object into a byte. Before Java 7, we can initiate a new byte with a predefined size (same with the…
How to read file in Java – FileInputStream
In Java, we use FileInputStream to read bytes from a file, such as an image file or binary file. The FileInputStream.read() reads a byte at a time, and it will…
How to read file in Java – BufferedInputStream
Here is another example to show how to read a file in Java with BufferedInputStream and DataInputStream classes. The readLine() from the type DataInputStream is deprecated. Sun officially announced this…
How to read a UTF-8 file in Java
In Java, the InputStreamReader accepts a charset to decode the byte streams into character streams. We can pass a StandardCharsets.UTF_8 into the InputStreamReader constructor to read data from a UTF-8…
How to read a file in Java
This article focus on a few of the commonly used methods to read a file in Java. 1 - Files.lines, return a Stream (Java 8), 2 - Files.readString, returns a…