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You can use putIfAbsent method instead of put if you can use JDK1.8
- Ravi Hingarajiya March 17, 2014OR
Please use putIfAbsent method if you can use ConcurrentHashMap instead of HashMap
OR
Please check using hs.get(1) if null, then put
if(hs.get(1) == null) {
hs.put(1,2);
}