Yes, but the point is that there is at least a partial guarantee.
On 16 November 2010 14:55, Mikael <mikael-arons...@telia.com> wrote: > But that's only for Character 0x00 to 0x7F, the loop with the assert test > counts from 0 to 512. > > ----- Original Message ----- From: "sebb" <seb...@gmail.com> > To: <dev@harmony.apache.org> > Sent: Tuesday, November 16, 2010 3:42 PM > Subject: Re: Question about Character.valueOf() > > > The end of section 5.1.7 > > http://java.sun.com/docs/books/jls/third_edition/html/conversions.html#5.1.7 > > says: > > "If the value p being boxed is true, false, a byte, a char in the > range \u0000 to \u007f, or an int or short number between -128 and > 127, then let r1 and r2 be the results of any two boxing conversions > of p. It is always the case that r1 == r2." > > [See also subsequent discussion section] > > AFAIK, boxing uses valueOf to achieve this. > > On 16 November 2010 13:50, Mikael <mikael-arons...@telia.com> wrote: >> >> As far as I know there is no guarantee that valueOf returns the same >> object >> every time, it just gives class a chance to do it if it wants to. >> >> ----- Original Message ----- From: "lcj.dev" <lcj....@gmail.com> >> To: "dev" <dev@harmony.apache.org> >> Sent: Tuesday, November 16, 2010 2:44 PM >> Subject: Question about Character.valueOf() >> >> >>> Hi, all >>> Why this may be failed for other JREs? assertSame(Character.valueOf(c), >>> Character.valueOf(c)). >>> Thanks. >>> >>> please refers to this test case for details: >>> package org.apache.harmony.luni.tests.java.lang; >>> >>> import junit.framework.TestCase; >>> >>> public class CharacterImplTest extends TestCase { >>> >>> public void test_valueOfC() { >>> // test the cache range >>> for (char c = '\u0000'; c < 512; c++) { >>> Character e = new Character(c); >>> Character a = Character.valueOf(c); >>> assertEquals(e, a); >>> >>> // WARN: this assertion may not be valid on other JREs >>> assertSame(Character.valueOf(c), Character.valueOf(c)); >>> } >>> // test the rest of the chars >>> for (int c = '\u0512'; c <= Character.MAX_VALUE; c++) { >>> assertEquals(new Character((char) c), Character.valueOf((char) >>> c)); >>> } >>> } >>> } >>> 2010-11-16 >>> >>> >>> >>> lcj.dev >> >> > >
