Performance Question

[Nilesh Raje]

Hi Friends,

I came across this question and was unable to answer this. Can anyone help me regarding this question?

This is the given Class

public class WhatDoIDo {
private X x;
private boolean b;
private Object o;

public WhatDoIDo(X x) {
this.x = x;
}

synchronized Object z() {
if (!b) {
o = x.y();
b = true;
}
return o;
}

public interface X {
Object y();
}
}

Here were the questions asked.

1. What does this class do?
2. Rename the class and its members in such a way that it is more clear what this class does.
3. Generify the class.
4. Improve performance of the class in concurrent environment using the Java Concurrency package.
Explain why the performance is better.
5. Write a test which demonstrates performance improvement in a concurrent environment.

[Added CodeTags]

[Ulf Dittmer]

Help with what, specifically? This looks like homework that you should be doing in order to learn. Folks here are not going to do it for you.

So: What thoughts have you had on any of these? Where are you stuck making progress?

[Nilesh Raje]

Yes it is homework. But I am not good at Synchronize thingy.! My concepts are not clear about this. I did do my other homework . So please do tell me what would be your answers? I will make sure i shall study that later but the reason i posted is i am running short of time n i need this to be done asap.

Thanks