How to use synchronizedMap for HashMap

I wrote a class as follows

public class MyMap extends HashMap
{
......
}

Now i realize the HashMap is not synchronized. I will be instanting MyMap class and i will be inserting data and this MyMap will be accessed by Multiple threads. Hence that warrants me to use synchronization.
Now will the following thing work?

public class MyMap extends HashMap
(
public MyMap()
{
this = Collections.synchronizedMap(this);
}
}

Is the above code correct ?










Now if HashMap is a data member of MyMap call , then i think i might now how to use synchronizedMap

public class MyMap
{
public HashMap tempMap;
public MyMap() {
tempMap = Collections.synchronizedMap(new HashMap());
}
}


Can someone help me on this. I would really appreciate all the help




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