| /* |
| * The Apache Software License, Version 1.1 |
| * |
| * |
| * Copyright (c) 2003 The Apache Software Foundation. All rights |
| * reserved. |
| * |
| * 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. |
| * |
| * 3. The end-user documentation included with the redistribution, |
| * if any, must include the following acknowledgment: |
| * "This product includes software developed by the |
| * Apache Software Foundation (http://www.apache.org/)." |
| * Alternately, this acknowledgment may appear in the software itself, |
| * if and wherever such third-party acknowledgments normally appear. |
| * |
| * 4. The names "Apache" and "Apache Software Foundation" must |
| * not be used to endorse or promote products derived from this |
| * software without prior written permission. For written |
| * permission, please contact apache@apache.org. |
| * |
| * 5. Products derived from this software may not be called "Apache |
| * XMLBeans", nor may "Apache" appear in their name, without prior |
| * written permission of the Apache Software Foundation. |
| * |
| * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED 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 APACHE SOFTWARE FOUNDATION OR |
| * ITS 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. |
| * ==================================================================== |
| * |
| * This software consists of voluntary contributions made by many |
| * individuals on behalf of the Apache Software Foundation and was |
| * originally based on software copyright (c) 2000-2003 BEA Systems |
| * Inc., <http://www.bea.com/>. For more information on the Apache Software |
| * Foundation, please see <http://www.apache.org/>. |
| */ |
| |
| package streamtest; |
| |
| import java.util.Date; |
| import java.util.HashMap; |
| |
| public class Intern |
| { |
| static final int MAX_ITER = 1000; |
| static final int MAX_CREATE = 100; |
| static final int MAX_COMP = 100; |
| |
| public static void main(String[] args) |
| { |
| char[] ca = { 'a', 'a', 'a'}; |
| |
| System.out.println("aaa" == "aaa"); |
| System.out.println("aaa" == new String("aaa")); |
| System.out.println("aaa" == new String(ca)); |
| System.out.println("aaa" == new String(ca).intern()); |
| System.out.println("aaa" == String.valueOf(ca)); |
| System.out.println("aaa" == String.copyValueOf(ca)); |
| System.out.println("aaa" == "aaa"); |
| |
| long start; |
| double d1 = 0; |
| double d2 = 0; |
| double d3 = 0; |
| |
| start = new Date().getTime(); |
| for( int i = 0; i<MAX_ITER; i++ ) |
| { |
| Cache cache = new Cache(); |
| Cache.QName qn1 = cache.create1(String.valueOf( Math. |
| round(Math.random()*MAX_CREATE/10)).intern(), |
| String.valueOf(Math.round(Math.random()*MAX_CREATE/10)). |
| intern()); |
| System.out.println(qn1.toString()); |
| for( int j=0; j<MAX_CREATE; j++ ) |
| { |
| Cache.QName qn2 = cache.create1(String.valueOf( Math. |
| round(Math.random()*MAX_CREATE/10)).intern(), |
| String.valueOf(Math.round(Math.random()*MAX_CREATE/10)). |
| intern()); |
| for( int k=0; k<MAX_COMP; k++ ) |
| { |
| boolean b = qn1 == qn2; |
| } |
| } |
| } |
| d1 = new Date().getTime() - start; |
| |
| start = new Date().getTime(); |
| for( int i = 0; i<MAX_ITER; i++ ) |
| { |
| Cache cache = new Cache(); |
| Cache.QName qn1 = cache.create1(String.valueOf( Math. |
| round(Math.random()*MAX_CREATE/10)).intern(), |
| String.valueOf(Math.round(Math.random()*MAX_CREATE/10)). |
| intern()); |
| for( int j=0; j<MAX_CREATE; j++ ) |
| { |
| Cache.QName qn2 = cache.create1(String.valueOf( Math. |
| round(Math.random()*MAX_CREATE/10)).intern(), |
| String.valueOf(Math.round(Math.random()*MAX_CREATE/10)). |
| intern()); |
| for( int k=0; k<MAX_COMP; k++ ) |
| { |
| boolean b = qn1.equalIntern(qn2); |
| } |
| } |
| } |
| d2 = new Date().getTime() - start; |
| |
| start = new Date().getTime(); |
| for( int i = 0; i<MAX_ITER; i++ ) |
| { |
| Cache cache = new Cache(); |
| Cache.QName qn1 = cache.create1(String.valueOf( Math. |
| round(Math.random()*MAX_CREATE/10)), |
| String.valueOf(Math.round(Math.random()*MAX_CREATE/10))); |
| for( int j=0; j<MAX_CREATE; j++ ) |
| { |
| Cache.QName qn2 = cache.create1(String.valueOf( Math. |
| round(Math.random()*MAX_CREATE/10)), |
| String.valueOf(Math.round(Math.random()*MAX_CREATE/10))); |
| for( int k=0; k<MAX_COMP; k++ ) |
| { |
| boolean b = qn1.equalExtern(qn2); |
| } |
| } |
| } |
| d3 = new Date().getTime() - start; |
| |
| System.out.println("create1:\t" + d1 + "\t" + d2 + "\t" + d3); |
| |
| //create2 |
| start = new Date().getTime(); |
| for( int i = 0; i<MAX_ITER; i++ ) |
| { |
| Cache cache = new Cache(); |
| Cache.QName qn1 = cache.create2(String.valueOf( Math. |
| round(Math.random()*MAX_CREATE/10)).intern(), |
| String.valueOf(Math.round(Math.random()*MAX_CREATE/10)). |
| intern()); |
| for( int j=0; j<MAX_CREATE; j++ ) |
| { |
| Cache.QName qn2 = cache.create2(String.valueOf( Math. |
| round(Math.random()*MAX_CREATE/10)).intern(), |
| String.valueOf(Math.round(Math.random()*MAX_CREATE/10)). |
| intern()); |
| for( int k=0; k<MAX_COMP; k++ ) |
| { |
| boolean b = qn1 == qn2; |
| } |
| } |
| } |
| d1 = new Date().getTime() - start; |
| |
| start = new Date().getTime(); |
| for( int i = 0; i<MAX_ITER; i++ ) |
| { |
| Cache cache = new Cache(); |
| Cache.QName qn1 = cache.create2(String.valueOf( Math. |
| round(Math.random()*MAX_CREATE/10)).intern(), |
| String.valueOf(Math.round(Math.random()*MAX_CREATE/10)). |
| intern()); |
| for( int j=0; j<MAX_CREATE; j++ ) |
| { |
| Cache.QName qn2 = cache.create2(String.valueOf( Math. |
| round(Math.random()*MAX_CREATE/10)).intern(), |
| String.valueOf(Math.round(Math.random()*MAX_CREATE/10)). |
| intern()); |
| for( int k=0; k<MAX_COMP; k++ ) |
| { |
| boolean b = qn1.equalIntern(qn2); |
| } |
| } |
| } |
| d2 = new Date().getTime() - start; |
| |
| start = new Date().getTime(); |
| for( int i = 0; i<MAX_ITER; i++ ) |
| { |
| Cache cache = new Cache(); |
| Cache.QName qn1 = cache.create2(String.valueOf( Math. |
| round(Math.random()*MAX_CREATE/10)), |
| String.valueOf(Math.round(Math.random()*MAX_CREATE/10))); |
| for( int j=0; j<MAX_CREATE; j++ ) |
| { |
| Cache.QName qn2 = cache.create2(String.valueOf( Math. |
| round(Math.random()*MAX_CREATE/10)), |
| String.valueOf(Math.round(Math.random()*MAX_CREATE/10))); |
| for( int k=0; k<MAX_COMP; k++ ) |
| { |
| boolean b = qn1.equalExtern(qn2); |
| } |
| } |
| } |
| d3 = new Date().getTime() - start; |
| |
| System.out.println("create2:\t" + d1 + "\t" + d2 + "\t" + d3); |
| |
| //create3 |
| start = new Date().getTime(); |
| for( int i = 0; i<MAX_ITER; i++ ) |
| { |
| Cache cache = new Cache(); |
| Cache.QName qn1 = cache.create3(String.valueOf( Math. |
| round(Math.random()*MAX_CREATE/10)).intern(), |
| String.valueOf(Math.round(Math.random()*MAX_CREATE/10)). |
| intern()); |
| for( int j=0; j<MAX_CREATE; j++ ) |
| { |
| Cache.QName qn2 = cache.create3(String.valueOf( Math. |
| round(Math.random()*MAX_CREATE/10)).intern(), |
| String.valueOf(Math.round(Math.random()*MAX_CREATE/10)). |
| intern()); |
| for( int k=0; k<MAX_COMP; k++ ) |
| { |
| boolean b = qn1 == qn2; |
| } |
| } |
| } |
| d1 = new Date().getTime() - start; |
| |
| start = new Date().getTime(); |
| for( int i = 0; i<MAX_ITER; i++ ) |
| { |
| Cache cache = new Cache(); |
| Cache.QName qn1 = cache.create3(String.valueOf( Math. |
| round(Math.random()*MAX_CREATE/10)).intern(), |
| String.valueOf(Math.round(Math.random()*MAX_CREATE/10)). |
| intern()); |
| for( int j=0; j<MAX_CREATE; j++ ) |
| { |
| Cache.QName qn2 = cache.create3(String.valueOf( Math. |
| round(Math.random()*MAX_CREATE/10)).intern(), |
| String.valueOf(Math.round(Math.random()*MAX_CREATE/10)). |
| intern()); |
| for( int k=0; k<MAX_COMP; k++ ) |
| { |
| boolean b = qn1.equalIntern(qn2); |
| } |
| } |
| } |
| d2 = new Date().getTime() - start; |
| |
| start = new Date().getTime(); |
| for( int i = 0; i<MAX_ITER; i++ ) |
| { |
| Cache cache = new Cache(); |
| Cache.QName qn1 = cache.create3(String.valueOf( Math. |
| round(Math.random()*MAX_CREATE/10)), |
| String.valueOf(Math.round(Math.random()*MAX_CREATE/10))); |
| for( int j=0; j<MAX_CREATE; j++ ) |
| { |
| Cache.QName qn2 = cache.create3(String.valueOf( Math. |
| round(Math.random()*MAX_CREATE/10)), |
| String.valueOf(Math.round(Math.random()*MAX_CREATE/10))); |
| for( int k=0; k<MAX_COMP; k++ ) |
| { |
| boolean b = qn1.equalExtern(qn2); |
| } |
| } |
| } |
| d3 = new Date().getTime() - start; |
| |
| System.out.println("create3:\t" + d1 + "\t" + d2 + "\t" + d3); |
| } |
| } |
| |
| class Cache |
| { |
| HashMap h1 = new HashMap(); |
| |
| QName create1(String l, String u) |
| { |
| return new QName(l ,u); |
| } |
| |
| QName create2(String l, String u) |
| { |
| int hcode = l.hashCode() + 33*u.hashCode(); |
| Integer key = new Integer(hcode); |
| |
| if( h1.containsKey( key ) ) |
| return (QName)h1.get(key); |
| |
| QName qn = new QName(l, u); |
| h1.put(key, qn); |
| return qn; |
| } |
| |
| synchronized QName create3(String l, String u) |
| { |
| return create2(l, u); |
| } |
| |
| static class QName |
| { |
| private String local; |
| private String uri; |
| |
| private QName() |
| {} |
| private QName(String l, String u) |
| { |
| local = l; |
| uri = u; |
| } |
| |
| boolean equalIntern( QName qn ) |
| { |
| return local==qn.local && uri==qn.uri; |
| } |
| |
| boolean equalExtern( QName qn ) |
| { |
| return local.equals(qn.local) && uri.equals(qn.uri); |
| } |
| |
| public String toString() |
| { |
| return local + "," + uri; |
| } |
| } |
| } |
| |