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Standard Library

File I/O

Read and write files, lines and path operations in Kotlin.

kotlin file ioRead Text File in KotlinreadText reads entire file content as String. A Kotlin example with source code and sample output.kotlin file ioWrite Text File in KotlinwriteText writes string content to a file. A Kotlin example with source code and sample output.kotlin file ioRead Lines from File in KotlinreadLines returns list of lines from a text file. A Kotlin example with source code and sample output.kotlin file ioFile Exists Check in Kotlinexists() checks whether file or directory is present. A Kotlin example with source code and sample output.kotlin file ioFile Path Operations in KotlinFile class provides name, parent and absolutePath properties. A Kotlin example with source code and sample output.kotlin file iouse Function for Resources in KotlinThe use extension closes Closeable resources automatically, even when exceptions occur. A Kotlin example with source code and sample output.

Related topics

List, Map & Set Immutable and mutable collection operations, filtering and sorting. Sequences Lazy sequences, operations and when to use sequences vs lists. Ranges Range expressions, until, downTo and step in Kotlin. Regular Expressions Regex matching, find, replace and common patterns in Kotlin.