CODEWITHSUNDEEP
javafileioprintwriterwriter
DSOI__UNUNOCTIUM
DSOI__UNUNOCTIUM

Reputation: 100

Java PrintWriter File Overwrite

I want to write into a file using UTF-16 so I use PrintWriter(file,"UTF-16"), but then it deletes everything in the file, I could use FileWriter(file,true), but then it wouldn't be in UTF-16, and there apparently isn't a constructor for PrintWriter like PrintWriter(Writer,Charset,boolean append);

What should I do?

Upvotes: 1

Views: 876

Answers (3)

slim
slim

Reputation: 41223

The JavaDoc for FileWriter says:

The constructors of this class assume that the default character encoding and the default byte-buffer size are acceptable. To specify these values yourself, construct an OutputStreamWriter on a FileOutputStream.

So you can do:

 Writer writer = new PrintWriter(
     new OutputStreamWriter(
           new FileOutputStream(filename, true),
           StandardCharsets.UTF16));

You might want to include BufferedOutputStream in there too for maximum efficiency.

Upvotes: 5

Thomas Fritsch
Thomas Fritsch

Reputation: 10127

You can do it by using

new PrintWriter(new OutputStreamWriter(new FileOutputStream(file, true), "UTF-16"));

Upvotes: 1

Jon Skeet
Jon Skeet

Reputation: 1500525

Use OutputStreamWriter with a UTF-16 charset, wrapping a FileOutputStream opened with append=true. Alternatives, use Files.newBufferedWriter:

try (Writer writer = Files.newBufferedWriter(
        Paths.of("filename.txt"),
        StandardCharsets.UTF_16,
        StandardOpenOption.APPEND)) {
    ...
}

Upvotes: 3

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