Generic Stack
/*
* 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.
*/
public class MyStackDemo {
public static void main(String[] args) {
MyStack<String> ms1 = new MyStack<String>();
ms1.push("billg");
ms1.push("scottm");
while (ms1.hasNext()) {
String name = ms1.pop();
System.out.println(name);
}
// Old way of using Collections: not type safe.
MyStack ms2 = new MyStack();
ms2.push("billg"); // EXPECT WARNING
ms2.push("scottm"); // EXPECT WARNING
ms2.push(new java.util.Date()); // EXPECT WARNING
// Show that it is broken
try {
String bad = (String)ms2.pop();
System.err.println("Didn't get expected exception!");
} catch (ClassCastException ex) {
System.out.println("Did get expected exception.");
}
// Removed the brokenness, print rest of it.
while (ms2.hasNext()) {
String name = (String)ms2.pop();
System.out.println(name);
}
}
}
/** A lax Stack implementation.
* @version $Id: MyStack.java,v 1.4 2004/03/07 23:18:59 ian Exp $
*/
class MyStack<T> {
private int ix = 0;
public static final int MAX = 10;
private T[] data = (T[])new Object[MAX];
public void push(T obj) {
data[ix++] = obj;
}
public boolean hasNext() {
return ix > 0;
}
public boolean hasRoom() {
return ix < MAX;
}
public T pop() {
if (hasNext()) {
return data[--ix];
}
throw new ArrayIndexOutOfBoundsException(-1);
}
}
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