How do you separate a HashMap onto separate lines using FileOutputStream?

Question

I have a HashMap that I would like to write as separate lines to a text file. How do you go about doing this? In the SysOut above the code for writing to a text file I am printing out the values in the way that I would like to print them.

    map.forEach((k,v)-> System.out.println(k+", "+v));

    File file = new File(Constants.FILEPATH);

    FileOutputStream f = new FileOutputStream(file);  
    ObjectOutputStream s = new ObjectOutputStream(f);          
    s.writeObject(map);
    s.close();

teppic · Accepted Answer · 2016-11-30T09:47:01.743

2

Don't use an ObjectOutputStream, use a PrintWriter:

try (PrintWriter out = new PrintWriter(file)) {
    map.forEach((k,v) -> out.println(k+", "+v));
}

edited Nov 30 '16 at 09:47

answered Nov 30 '16 at 09:43

teppic

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That’s right. An `ObjectOutputStream` is for serialization, not for writing a human-readable file. – Ole V.V. Nov 30 '16 at 09:45
Did the job! Thank you – Nazrod12 Nov 30 '16 at 09:59

How do you separate a HashMap onto separate lines using FileOutputStream?

1 Answers1