---

id: 58

slug: "writing-files"

title: "Writing files"

category: "io"

difficulty: "beginner"

jdkVersion: "11"

oldLabel: "Java 8"

modernLabel: "Java 11+"

oldApproach: "FileWriter + BufferedWriter"

modernApproach: "Files.writeString()"

oldCode: |-

try (FileWriter fw =

new FileWriter("out.txt");

BufferedWriter bw =

new BufferedWriter(fw)) {

bw.write(content);

}

modernCode: |-

Files.writeString(

Path.of("out.txt"),

content

);

summary: "Write a String to a file with one line."

explanation: "Files.writeString() writes content to a file with UTF-8 encoding by\

\ default. Options can be passed for appending, creating, etc."

whyModernWins:

- icon: "📏"

title: "One line"

desc: "No writer wrapping or try-with-resources needed."

- icon: "🛡️"

title: "Safe defaults"

desc: "UTF-8 encoding, proper file handle cleanup."

- icon: "🔧"

title: "Options"

desc: "Pass OpenOption flags for append, create, etc."

support:

state: "available"

description: "Widely available since JDK 11 (Sept 2018)"

prev: "io/reading-files"

next: "io/inputstream-transferto"

related:

- "io/reading-files"

- "io/http-client"

- "io/path-of"

docs:

- title: "Files.writeString()"

href: "https://docs.oracle.com/en/java/javase/25/docs/api/java.base/java/nio/file/Files.html#writeString(java.nio.file.Path,java.lang.CharSequence,java.nio.file.OpenOption...)"