为什么我们不能在Java的main方法中实现一个方法? [英] Why can't we implement a method inside the main method in Java?

问题描述

为什么这行不通?

public class AddArray
{
    public static void main(String[] args) 
    {

        int[] x = {1,2,3};
        int[] y = {1,2,3};

        dd(x,y);

        public static void add(int[]a, int[]b)
        {
            int[] sum = new int[a.length];
            for (int i=0; i<a.length; i++)
                sum[i] = a[i] + b[i];
            for (int i=0; i<a.length; i++)
                System.out.println(sum[i]);
        }
    }
}

推荐答案

您不能在Java中的另一个方法中定义一个方法.特别是，您不能在main方法中定义方法.

You can't define a method within another method in Java. In particular, you can't define a method within the main method.

对于您而言，您可以这样写:

In your case, you could write:

public class AddArray {

    public static void main(String[] args) {

        int[] x = {1,2,3};
        int[] y = {1,2,3};

        add (x,y);
    }

    private static void add (int[] a, int[] b) {
        int[] sum = new int[a.length];
        for (int i = 0; i < a.length; i++)
            sum[i] = a[i] + b[i];
        for (int i = 0; i < a.length; i++)
            System.out.println(sum[i]);
    }
}

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