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GetLatestBuildNumber.java

import java.io.*;
import java.util.concurrent.atomic.AtomicInteger;

/**
 * http://stackoverflow.com/q/12321837/7507
 */
public class GetLatestBuildNumber {
    
    private static final AtomicInteger number = new AtomicInteger();
    private static final String FILE_NAME = "latest_build_number.txt";

    public static void main(String[] args) {
        int latest = fetchLatestBuildNumber();
        writeLatestBuildNumber(latest);
        int next = fetchLatestBuildNumber();
        int previous;
        try {
            previous = readLatestBuildNumber();
            System.out.println("previous build number " + previous);
            System.out.println("current build number " + next);
        } catch (IOException ioe) {
            System.out.println("failed to read last build number " +
                    "from file " + FILE_NAME + ": " + ioe);
        } catch (NumberFormatException nfx) {
            System.out.println("failed to parse last build number: " + nfx);
        }
    }

    private static int fetchLatestBuildNumber() {
        return number.getAndIncrement();
    }

    private static void writeLatestBuildNumber(int number) {
        int latestBuildNumber = fetchLatestBuildNumber();
        FileWriter writer = null;
        try {
            writer = new FileWriter(FILE_NAME);
            writer.write(Integer.toString(latestBuildNumber));
        } catch (IOException ex) {
            System.out.println("failed to write build number "
                    + number + ", error: " + ex);
        } finally {
            try {
                if (writer != null) writer.close();
            } catch (IOException e) { /* we tried... */ }
        }
    }

    private static int readLatestBuildNumber() throws IOException {
        BufferedReader reader = null;
        try {
            reader = new BufferedReader(new FileReader(FILE_NAME));
            String number = reader.readLine();
            return Integer.parseInt(number);
        } finally {
            try {
                if (reader != null) reader.close();
            } catch (IOException e) { /* we tried. */ }
        }
    }
}