| /* Copyright 2004 The Apache Software Foundation |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| 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; |
| } |
| } |
| } |
| |