Write LinkedHashMap to a text file?

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How to efficiently iterate over each entry in a 'Map'? 38 answers

Iterate through a HashMap [duplicate] 7 answers

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Because you're trying to write your entire Map to the file and not individual entries you could use writeObject() and readObject() like this:

Map<String, String> m1 = new LinkedHashMap<String, String>(16, 0.75f, true);

m1.put("John Smith", "555-555-5555");
m1.put("Jane Smith", "444-444-4444");

//Write to file
FileOutputStream fout = new FileOutputStream("file.out");
ObjectOutputStream oos = new ObjectOutputStream(fout);
oos.writeObject(m1);

//Read from file
FileInputStream fin = new FileInputStream("file.out");
ObjectInputStream ois = new ObjectInputStream(fin);
Map<String, String> m2 = (LinkedHashMap<String, String>) ois.readObject();

Hope this helps.

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