See if Strings are shared in Java
/*
* 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 $
*
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* modification, are permitted provided that the following conditions
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* 1. Redistributions of source code must retain the above copyright
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* 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
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS
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* 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.
*/
/**
* See if Strings are shared in Java.
* The thing is, it depends on whether you say
* "string" or new String("mystring");
*/
public class TwoStrings {
public static void main(String[] argv) {
String one = "A String";
String two = "A String";
String three = new String(one);
compare(one, two);
compare(two, three);
}
public static void compare(String one, String two) {
System.out.println("Comparing...");
if (one == two) {
System.out.println("Strings are shared: " +
one.hashCode() + ", " + two.hashCode());
} else if (one.equals(two)) {
System.out.println("At least the strings are equal: " +
one.hashCode() + ", " + two.hashCode());
System.out.println((Object)one);
System.out.println(two);
} else System.out.println("This is rather distressing, sir.");
System.out.println();
}
}
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