在Java中输入数组 [英] Entering array in java

问题描述

我找到了这段代码，该代码读取一些数字作为参数，然后将它们分配为数组中的值.我不明白java如何知道数组长度应该是多少?

I found this code, which reads some numbers as arguments and then assigns them as values in an array. I can't understand how java knows what the array length should be ?

public static void main(String[] args) {
    int n = args.length;
    int[] dataset = new int[n];

    for (int i = 0; i < n; i++) {
       dataset[i] = Integer.parseInt(args[i]);

    }
    System.out.println(java.util.Arrays.toString(dataset));
} 

推荐答案

您应该通过命令行运行此代码.示例:

You're supposed to run this code through the command line. Example:

java ClassName 0 4 7 12 55

Java将知道长度，因为它具有输入值数组: 0 4 7 12 55 .此数组与传递给 main 方法的 String [] args 相同.

Java will know the length because it has an array of input values: 0 4 7 12 55. This array is the same as String[] args passed into the main method.

如果您想了解有关命令行参数的更多信息，那么我建议您

If you want to learn more about command line arguments, then I'd recommend this source.

注意:有些IDE可以为您处理命令行参数.

Note: there are some IDEs that handle command line arguments for you.

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