Code example for ConcurrentHashMap

Methods: putIfAbsent

0
    } 
 
    @Override 
    public String storeCode(String code, String ip) {
        String key = CodeKeyGenerator.generateKey(code);
        tehcodez.putIfAbsent(key, code);
        return key;
    } 
 
    @Override 
    public String retrieveCode(String key, String ip) {
        return tehcodez.get(key);
    } 
 
} 
Connect your IDE to all the code out there  Get Codota for Java