[77] in java-interest
Re: problem with synchronize( )
daemon@ATHENA.MIT.EDU (Suresh K Jois)
Wed May 10 17:12:35 1995
Date: Wed, 10 May 95 12:41:50 -0800
From: suresh@internet.net (Suresh K Jois)
To: java-interest@java.Eng.Sun.COM
>Hi Suresh,
>
>> In the following, the first synchronize() statement completely confuses
>> javac, while the second one works. Why is this ?
>>
>> int i;
>> int j[] = new int[5];
>> .....
>> synchronize(i)
>> { i = 3;
>> ......
>> }
>> ......
>> synchronize(j)
>> { j[1] = 3;
>> .....
>> }
>
>The problem is that you can only synchronize on objects. Unfortunately
>integers aren't objects so you can't synchronize on them. It is actually
>very unusual that you have to use the synchronize statement, it is often
>enough to use the synchronize modifier on the methods you are in.
If I understand correctly, synchronize methods serialize access only to
the instance variables of their own class/object, and hence if I want to
serialize access to instance vars of other classes, I have to explicitly use
synchronize.
Is this correct ? BTW, if ints are not classes nor objects, what are they ?
I thought everything in Java was a class or an object.
- Suresh
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