Java File HandlingLesson 52Free preview

Java Read Files

This lesson is part of Java · All levels

Summary

Reading files can be done with Files.readAllLines() which returns a row list, or Files.readString() which returns the entire content as a single string. For large files that are not loaded in memory, use BufferedReader to read line by line. All of these methods are in java.nio.file.Files so the code is short.

Key points

Files.readAllLines(path) produces a List<String>, one element per line
Files.readString(path) generates the entire file content as one string
Files.readAllBytes(path) used for binary data
BufferedReader.readLine() returns null when it reaches the end of the file
Charsets can be specified, for example, to be consistent

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