Store 2D array (String) to file and retrieve it

Question

I have made a simple program that has a 2D String array storing lots of data. I have searched a lot of places for how to store and retrieve 2D arrays. I want to save the dat

Answer 1

There is an additional question to resolve, which is how do you store the sizes of the arrays as well as the contents. I would recommend using conversion to JSON. If you get the Jackson library, you should be able to use the Jackson Object Mapper. I would recommend storing your arrays within another object.

e.g.

class MyClass {
    String[][] myArray;

    // add the getters and setters to this class for myArray too
}

Then for storing

MyClass myObject = new MyClass();

// set the arrays here to whatever you like

ObjectMapper mapper = new ObjectMapper();
mapper.write(new File("c:\somedir\somefile.txt"), myObject);

Then for loading

ObjectMapper mapper = new ObjectMapper();
MyClass loaded = mapper.readValue(new File("c:\somedir\somefile.txt", MyClass.class);

// then you can use loaded as the source of your data