CODEWITHSUNDEEP
javafileoutputstream
iSun
iSun

Reputation: 1754

How to write data with FileOutputStream without losing old data?

If you work with FileOutputStream methods, each time you write your file through this methods you've been lost your old data. Is it possible to write file without losing your old data via FileOutputStream?

Upvotes: 93

Views: 131571

Answers (2)

o_o
o_o

Reputation: 516

Use the constructor for appending material to the file:

FileOutputStream(File file, boolean append)
Creates a file output stream to write to the file represented by the specified File object.

So to append to a file say "abc.txt" use 

FileOutputStream fos=new FileOutputStream(new File("abc.txt"),true);

Upvotes: 22

Mat
Mat

Reputation: 206689

Use the constructor that takes a File and a boolean

FileOutputStream(File file, boolean append)

and set the boolean to true. That way, the data you write will be appended to the end of the file, rather than overwriting what was already there.

Upvotes: 175

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