Loading a map using Properties class

Question

I have a map with 75000 entries and each entry value will be of size 10kb on average.

I load this map into memory using Properties class . But due to the size of the

Answer 1

Don't use Properties, which is legacy

1. Divide entries into multiple files

2. Read each file in sequence, load and process using Preferences

Example code:

package com.mypack.test;

import java.io.*;
import java.util.*;
import java.util.prefs.Preferences;

public class PreferencesExample {

    public static void main(String args[]) throws FileNotFoundException {
        Preferences ps = Preferences.userNodeForPackage(PreferencesExample.class);
        // Load file object
        File fileObj = new File("d:\\data.xml");
        try {
            FileInputStream fis = new FileInputStream(fileObj);
            ps.importPreferences(fis);
            System.out.println("Prefereces:"+ps);
            System.out.println("Get property1:"+ps.getInt("property1",10));

        } catch (Exception err) {
            err.printStackTrace();
        }
    }
}

Sample xml: