How to write data with FileOutputStream without losing old data?












73















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?










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  • 1





    If you are wondering how you could have worked this out for yourself, you could have read the Javadoc. docs.oracle.com/javase/7/docs/api/java/io/FileOutputStream.html

    – Peter Lawrey
    Dec 17 '11 at 16:21











  • [OutputStreamWriter is used instead of FileOutputStream][1] [1]: stackoverflow.com/questions/23320070/…

    – sourabh
    Apr 27 '14 at 10:41






  • 1





    @PeterLawrey to learn by ourself, one usually simply ask internet. And SO is the 1st result before the java doc :-)

    – Juh_
    Dec 30 '17 at 22:12
















73















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?










share|improve this question




















  • 1





    If you are wondering how you could have worked this out for yourself, you could have read the Javadoc. docs.oracle.com/javase/7/docs/api/java/io/FileOutputStream.html

    – Peter Lawrey
    Dec 17 '11 at 16:21











  • [OutputStreamWriter is used instead of FileOutputStream][1] [1]: stackoverflow.com/questions/23320070/…

    – sourabh
    Apr 27 '14 at 10:41






  • 1





    @PeterLawrey to learn by ourself, one usually simply ask internet. And SO is the 1st result before the java doc :-)

    – Juh_
    Dec 30 '17 at 22:12














73












73








73


12






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?










share|improve this question
















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?







java fileoutputstream






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edited Dec 17 '11 at 12:39









BalusC

848k29831503221




848k29831503221










asked Dec 17 '11 at 12:33









iSuniSun

90652145




90652145








  • 1





    If you are wondering how you could have worked this out for yourself, you could have read the Javadoc. docs.oracle.com/javase/7/docs/api/java/io/FileOutputStream.html

    – Peter Lawrey
    Dec 17 '11 at 16:21











  • [OutputStreamWriter is used instead of FileOutputStream][1] [1]: stackoverflow.com/questions/23320070/…

    – sourabh
    Apr 27 '14 at 10:41






  • 1





    @PeterLawrey to learn by ourself, one usually simply ask internet. And SO is the 1st result before the java doc :-)

    – Juh_
    Dec 30 '17 at 22:12














  • 1





    If you are wondering how you could have worked this out for yourself, you could have read the Javadoc. docs.oracle.com/javase/7/docs/api/java/io/FileOutputStream.html

    – Peter Lawrey
    Dec 17 '11 at 16:21











  • [OutputStreamWriter is used instead of FileOutputStream][1] [1]: stackoverflow.com/questions/23320070/…

    – sourabh
    Apr 27 '14 at 10:41






  • 1





    @PeterLawrey to learn by ourself, one usually simply ask internet. And SO is the 1st result before the java doc :-)

    – Juh_
    Dec 30 '17 at 22:12








1




1





If you are wondering how you could have worked this out for yourself, you could have read the Javadoc. docs.oracle.com/javase/7/docs/api/java/io/FileOutputStream.html

– Peter Lawrey
Dec 17 '11 at 16:21





If you are wondering how you could have worked this out for yourself, you could have read the Javadoc. docs.oracle.com/javase/7/docs/api/java/io/FileOutputStream.html

– Peter Lawrey
Dec 17 '11 at 16:21













[OutputStreamWriter is used instead of FileOutputStream][1] [1]: stackoverflow.com/questions/23320070/…

– sourabh
Apr 27 '14 at 10:41





[OutputStreamWriter is used instead of FileOutputStream][1] [1]: stackoverflow.com/questions/23320070/…

– sourabh
Apr 27 '14 at 10:41




1




1





@PeterLawrey to learn by ourself, one usually simply ask internet. And SO is the 1st result before the java doc :-)

– Juh_
Dec 30 '17 at 22:12





@PeterLawrey to learn by ourself, one usually simply ask internet. And SO is the 1st result before the java doc :-)

– Juh_
Dec 30 '17 at 22:12












2 Answers
2






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oldest

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134














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.






share|improve this answer































    19














    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);





    share|improve this answer























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      2 Answers
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      2 Answers
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      134














      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.






      share|improve this answer




























        134














        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.






        share|improve this answer


























          134












          134








          134







          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.






          share|improve this answer













          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.







          share|improve this answer












          share|improve this answer



          share|improve this answer










          answered Dec 17 '11 at 12:36









          MatMat

          165k29313344




          165k29313344

























              19














              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);





              share|improve this answer




























                19














                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);





                share|improve this answer


























                  19












                  19








                  19







                  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);





                  share|improve this answer













                  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);






                  share|improve this answer












                  share|improve this answer



                  share|improve this answer










                  answered Dec 17 '11 at 12:37









                  o_oo_o

                  47129




                  47129






























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