java - how do you write arraylist to a binary file

Question

how do you write ArrayList into a binary file?

lets say i have a arraylist called people

i am trying to write that into a binary file using writeListToBinary method

my method:

public void writeListToBinary (ArrayList<Person> inList) throws IOException

in my main method:

ArrayList<Person> people = new ArrayList<Person>();
writeListToBinary(people);

MeetTitan · Accepted Answer · 2014-12-05 23:30:14Z

2

I think you are trying to serialize your ArrayList. Implement Serializable to your class, then:

FileOutputStream fos = new FileOutputStream(fileToSaveTo); ObjectOutputStream out = new ObjectOutputStream(fos); out.writeObject(people)

Also take a look at http://www.tutorialspoint.com/java/java_serialization.htm

edited Dec 5, 2014 at 23:30

answered Dec 5, 2014 at 23:21

MeetTitan

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1 Comment

Steve Kuo Over a year ago

To add to this answer, an object is serializable if it implements Serializable, and all its non-static non-transient fields are serializable or primitives.

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