Readonly Files : File Commands « File Input Output « Java

1. Java
2. File Input Output
3. File Commands

Readonly Files

/* * Copyright (c) Ian F. Darwin, http://www.darwinsys.com/, 1996-2002. All rights * reserved. Software written by Ian F. Darwin and others. $Id: LICENSE,v 1.8 * 2004/02/09 03:33:38 ian Exp $ * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * 1. Redistributions of source code must retain the above copyright notice, * this list of conditions and the following disclaimer. 2. Redistributions in * binary form must reproduce the above copyright notice, this list of * conditions and the following disclaimer in the documentation and/or other * materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * * Java, the Duke mascot, and all variants of Sun's Java "steaming coffee cup" * logo are trademarks of Sun Microsystems. Sun's, and James Gosling's, * pioneering role in inventing and promulgating (and standardizing) the Java * language and environment is gratefully acknowledged. * * The pioneering role of Dennis Ritchie and Bjarne Stroustrup, of AT&T, for * inventing predecessor languages C and C++ is also gratefully acknowledged. */import java.io.File; import java.io.IOException; publicclass ReadOnly { publicstaticvoid main(String[] a) throws IOException { File f = newFile("f"); if (!f.createNewFile()) { System.out.println("Can't create new file."); return; } if (!f.canWrite()) { System.out.println("Can't write new file!"); return; } if (!f.setReadOnly()) { System.out.println("Grrr! Can't set file read-only."); return; } if (f.canWrite()) { System.out.println("Most immutable, captain!"); System.out .println("But it still says canWrite() after setReadOnly"); return; } else { System.out.println("Logical, captain!"); System.out .println("canWrite() correctly returns false after setReadOnly"); } } } 

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