java - 我怎样才能将这两个数组相加成一个新数组？

Question

如何将这两个数组相加成一个新数组？ arrayA 的第一个值和 arrayB 的第一个值在哪里？

public class Exercises {

    static BufferedReader in = new BufferedReader(
            new InputStreamReader(System.in));
    static PrintStream out = System.out;

    public static void main(String[] args) throws IOException {
        int numbersA[] = new int[5];
        int numbersB[] = new int[5];
        int numbersC[] = new int[5];

        for (int i = 0; i < 5; i++) {
            out.print("Please insert a number for the first array: ");
            numbersA[i] = Integer.parseInt(in.readLine());
        }

        for (int i = 0; i < 5; i++) {
            out.print("Please insert a number for the second array: ");
            numbersB[i] = Integer.parseInt(in.readLine());
        }
        int j = 0;
        for (int i = 0; i < 5; i++) {
            numbersC[j] = (numbersA.length[i] + numbersB.length[i]);
        }
        {

            out.print("The sum of the two arrays are: " + numbersC[j] + " ");
        }
        out.println();
    }
}

Answer 1

你很接近。 numbersA[i] 和 numbersB[i](不是每个数组的length)。此外，您不需要 j 并且应该在循环之前打印前奏。喜欢，

out.print("The sum of the two arrays are: ");
for (int i = 0; i < 5; i++) {
    numbersC[i] = numbersA[i] + numbersB[i];
    out.print(numbersC[i] + " ");
}
out.println();

最后，您的代码依赖于魔数(Magic Number)(硬编码数组长度)。这是一种不好的做法，相反，您应该使用 array.length，这样您的代码就不需要在数组大小发生变化时进行更改。喜欢，

int[] numbersA = new int[5];
int[] numbersB = new int[5];
for (int i = 0; i < numbersA.length; i++) {
    out.print("Please insert a number for the first array: ");
    numbersA[i] = Integer.parseInt(in.readLine());
}

for (int i = 0; i < numbersB.length; i++) {
    out.print("Please insert a number for the second array: ");
    numbersB[i] = Integer.parseInt(in.readLine());
}
int[] numbersC = new int[Math.min(numbersA.length, numbersB.length)];
out.print("The sum of the two arrays are: ");
for (int i = 0; i < numbersC.length; i++) {
    numbersC[i] = numbersA[i] + numbersB[i];
    out.print(numbersC[i] + " ");
}
out.println();