Go Premium for a chance to win a PS4. Enter to Win

x
?
Solved

synchronized with subclass

Posted on 2013-01-21
2
Medium Priority
?
301 Views
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.
0
Comment
Question by:royjayd
  • 2
2 Comments
 
LVL 36

Accepted Solution

by:
mccarl earned 1500 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).
0
 
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;
0

Featured Post

Ask an Anonymous Question!

Don't feel intimidated by what you don't know. Ask your question anonymously. It's easy! Learn more and upgrade.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Go is an acronym of golang, is a programming language developed Google in 2007. Go is a new language that is mostly in the C family, with significant input from Pascal/Modula/Oberon family. Hence Go arisen as low-level language with fast compilation…
Introduction This article is the first of three articles that explain why and how the Experts Exchange QA Team does test automation for our web site. This article explains our test automation goals. Then rationale is given for the tools we use to a…
Video by: Michael
Viewers learn about how to reduce the potential repetitiveness of coding in main by developing methods to perform specific tasks for their program. Additionally, objects are introduced for the purpose of learning how to call methods in Java. Define …
Viewers will learn about the different types of variables in Java and how to declare them. Decide the type of variable desired: Put the keyword corresponding to the type of variable in front of the variable name: Use the equal sign to assign a v…
Suggested Courses

772 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question