How do i copy (save) an object to a file

Question

hello
i am a programmer (but do not have so much experience in java more c, c++ and matlab)
i have a question
how do i copy an object to a file?
i have Object obj and i want to have a class with two methods save ( save it to a file') and load (open this saved file)
class SaveFile {
Object obj
// other fields perhaps if it is necessary
public save (Object obj) {
//code if which i don't know how to write and i need help from you
public load (object obj) {
//code if which i don't know how to write and i need help from you
i believe it is a standard think whith a standard solution so i hope people can show the complete code (or pseudocode) because i am not so good in java's io.package

Answer 1

Here's a small example that uses no expert features:import java.io.*;
public class Test {
    public static void main (String[] parameters) throws Exception {
        write (new TestObject ("Test"), "test.obj");
        System.out.println (((TestObject) read ("test.obj")).getName ());
    private static class TestObject implements Serializable {
        private String name;
        public TestObject (String name) {
            this.name = name;
        public String getName () {
            return name;
    private static void write (Serializable object, String filename) throws IOException {
        ObjectOutputStream out = null;
        try {
            out = new ObjectOutputStream (new FileOutputStream (filename));
            out.writeObject (object);
            out.flush ();
        } finally {
            if (out != null) {
                try {
                    out.close ();
                } catch (IOException exception) {}
    private static Object read (String filename) throws ClassNotFoundException, IOException {
        ObjectInputStream in = null;
        try {
            in = new ObjectInputStream (new FileInputStream (filename));
            return in.readObject ();
        } finally {
            if (in != null) {
                try {
                    in.close ();
                } catch (IOException exception) {}
}