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                ### Adder和Accumulator 多線程的環境中,如果多個線程需要頻繁地進行更新操作,且很少有讀取的動作(比如,在統計計算的上下文中),JavaAPI文檔中推薦大家使用新的類LongAdder、LongAccumulator、Double-Adder以及DoubleAccumulator,盡量避免使用它們對應的原子類型。這些新的類在設計之初就考慮了動態增長的需求,可以有效地減少線程間的競爭 ``` LongAdder adder = new LongAdder(); for (int i = 1; i <= 100; i++) { adder.add((long) i); } System.err.println(adder.sum()); LongAccumulator accumulator = new LongAccumulator(Long::sum, 0); accumulator.accumulate(10); accumulator.accumulate(10); accumulator.accumulate(100); System.err.println(accumulator.get()); ```
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