Hello Java Programmers, if you are looking for a way to read a file line by line in Java then don't worry, Java provides java.io package in JDK API for reading File in Java from File system e.g. C:\ or D:\ drive in Windows or any other directory in UNIX. First, you can use FileInputStream to open a file for reading. FileInputStream takes a String parameter which is a path for the file you want to read. Be careful while specifying File path as path separator is different on Window and UNIX. Windows uses backslash while UNIX uses forward slash as a path separator.
How to read file in Java using Scanner Example - text files
Reading a file with Scanner
From Java 5 onwards java.util.Scanner class can be used to read
file in Java. Earlier we have seen examples of reading
file in Java using FileInputStream and reading
file line by line using BufferedInputStream and in this Java tutorial, we
will See How can we use Scanner to read files in Java. Scanner is a
utility class in java.util package and provides several
convenient methods to read int, long, String, double etc from a source which can be an InputStream,
a file, or a String itself.
Top 43 Java IO and File System Interview Questions with Answers for 1 to 3 Years Experienced
Good knowledge of Java IO API is important for any Java developer but many of them barely pay attention to Java IO and NIO API, and that's why they often struggle during Java interviews when a question related to Input-Output operation is asked. In the past, I have shared many Java interview questions on topics like Collections, Concurrency, JVM internals, Garbage Collection, OOP, Design Patterns, and Data structure based coding problems, which received good feedback and helped many Java developer on their Java Interview preparation. Consequently, many of my readers were also asking about Java IO and File-based interview questions and this was one of the pending items on my TODO list for quite some time.
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