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                # Java 程序:使用數組計算平均值 > 原文: [https://www.programiz.com/java-programming/examples/average-arrays](https://www.programiz.com/java-programming/examples/average-arrays) #### 在此程序中,您將學習計算 Java 中給定數組的平均值。 ## 示例:使用數組計算平均值的程序 ```java public class Average { public static void main(String[] args) { double[] numArray = { 45.3, 67.5, -45.6, 20.34, 33.0, 45.6 }; double sum = 0.0; for (double num: numArray) { sum += num; } double average = sum / numArray.length; System.out.format("The average is: %.2f", average); } } ``` 運行該程序時,輸出為: ```java The average is: 27.69 ``` 在上面的程序中,`numArray`存儲要求平均值的浮點值。 然后,要計算`average`,我們首先需要計算數組中所有元素的`sum`。 這是使用 Java 中的`for-each`循環完成的。 最后,我們通過以下公式計算平均值: ```java average = sum of numbers / total count ``` 在這種情況下,總計數由`numArray.length`給出。 最后,我們使用`format()`函數打印平均值,以便使用`"%.2f"`將小數點限制為 2
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