Code example for ConcurrentMap

Methods: putIfAbsent

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    public V apply(K k) {
        return get(k);
    } 
 
    public V putIfAbsent(K key, V value) {
        return map.putIfAbsent(key, value);
    } 
 
    public boolean remove(Object key, Object value) {
        return map.remove(key, value);
    } 
 
    public boolean replace(K key, V oldValue, V newValue) {
        return map.replace(key, oldValue, newValue);
    } 
 
    public V replace(K key, V value) {
        return map.replace(key, value);
    } 
 
    public int size() {