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16 lines
315 B
16 lines
315 B
package alg;
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import java.util.Map;
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import java.util.concurrent.atomic.AtomicLong;
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public class Common {
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public static <K, V> void updateMap(Map<K, AtomicLong> map, K o) {
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// if not in map
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AtomicLong r = map.putIfAbsent(o, new AtomicLong(1));
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// else
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if (r != null)
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map.get(o).incrementAndGet();
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}
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}
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