Avoid creating FileStream directly

Docs > Code Analysis > Static Analysis Rules > Avoid creating FileStream directly

Cette page n'est pas encore disponible en français, sa traduction est en cours.
Si vous avez des questions ou des retours sur notre projet de traduction actuel, n'hésitez pas à nous contacter.

Metadata

ID: java-best-practices/avoid-filestream

Language: Java

Severity: Info

Category: Best Practices

Description

The classes that creates FileInputStream and FileOutputStream triggers too much garbage collection. Instead, use methods from the nio package that cause less garbage collection.

Learn More

JDK-8080225: # FileInput/OutputStream/FileChannel cleanup should be improved

Non-Compliant Code Examples

class Main {
    public static void main(String[] args) {
        String filename = "/path/to/file.txt";
        FileInputStream fis = new FileInputStream(filename);
        FileOutputStream fos = new FileOutputStream(filename);
        FileReader fr = new FileReader(filename);
        FileWriter fw = new FileWriter(filename);

        String s = new String("woeijf");
    }
}

Compliant Code Examples

class Main {
    public static void main(String[] args) {
        String filename = "/path/to/file.txt";
        try(InputStream is = Files.newInputStream(Paths.get(filename))) {
        }
        try(OutputStream os = Files.newOutputStream(Paths.get(filename))) {
        }
        try(BufferedReader br = Files.newBufferedReader(Paths.get(filename), StandardCharsets.UTF_8)) {
        }
        try(BufferedWriter wr = Files.newBufferedWriter(Paths.get(filename), StandardCharsets.UTF_8)) {
        }
    }
}