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synchronized with subclass

Posted on 2013-01-21
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Last Modified: 2013-01-21
hi guys

Object2 extends Object1

public class MyClass{
...
Object1 object1 = new Object1();
Object2 object2 = new Object2();
.....
....
synchronized( object1){
  // code 1
}

//code 2
synchronized( object 2){
  // code 3
}
}

When thread t1 executes code1, can thread t2 execute code3 at the same time?

thanks.
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Question by:royjayd
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2 Comments
 
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Accepted Solution

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mccarl earned 375 total points
ID: 38803889
Yes, object1 and object2 are two distinct objects are so there are two distinct 'locks' that are operated on here. The class heirarchy has no impact on this at all. This would even behave in the same way...

Object object1 = new Object();
Object object2 = new Object();

Again, because they are two different objects (even though they are the same class).
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LVL 36

Expert Comment

by:mccarl
ID: 38803894
The below, however, would result in only one code block being able to be executed at a time... (just to point out that it needs to be the same actual object that the synchronization works on, even this one object has to variables the refer to it)

Object2 object2 = new Object2();
Object1 object1 = object2;
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