Here you can find the source of writeObject(Object o, File f)
public static void writeObject(Object o, File f)
//package com.java2s; /*/*from w ww . j a v a 2 s.c o m*/ Copyright (C) 2004 EBI, GRL This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ import java.io.File; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.io.ObjectOutputStream; public class Main { /** * Write an object to a file. * * @param o The object to be written. * @param s The name of the file to write. */ public static void writeObject(Object o, String s) { writeObject(o, new File(s)); } public static void writeObject(Object o, File f) { try { ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream(f)); oos.writeObject(o); oos.close(); } catch (FileNotFoundException e) { System.err.println("Cannot find " + f); e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } }