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どれくらい調べたのか若干疑問ですが...
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```Java
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int sum = Arrays.stream(a).sum();
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```
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```
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**参考**
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- [java.util クラスArrays](https://docs.oracle.com/javase/jp/8/docs/api/java/util/Arrays.html)
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- [java.util.stream インタフェースIntStream](https://docs.oracle.com/javase/jp/8/docs/api/java/util/stream/IntStream.html)
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