如何添加两个不同大小的数组？

如果我有一个数组int[] a = new int[]{1, 2, 3};和另一个int[] b = new int[]{3, 2};我想将两者加在一起，我会这样做：

if (a.length >= b.length){
    int[] c = new int[a.length];

    for(int i=0; i<c.length; i++){
        c[i] = a[i] + b[i];
        return c;
    }
}
else{
    int[]c = new int[b.length];

    for(int i=0; i<c.length; i++){
        c[i] = a[i] + b[i];
        return c;
    }

但是当我打印 c 时，我得到 {4, 4} 并且末尾的 3 被遗漏了，我哪里出错了？

预先感谢您的任何帮助！

public Poly add(Poly a){

    if (coefficients.length <= a.coefficients.length){
        int[] c = new int[coefficients.length]; 

        for (int i=0; i<added.length; i++){
            c[i] = a.coefficients[i] + coefficients[i];
        }

        Poly total = new Poly(c);
        return total;
    }
    else{
        int[] added = new int[a.coefficients.length];

        for (int i=0; i<added.length; i++){
            added[i] = a.coefficients[i] + coefficients[i];
        }

        Poly total = new Poly(c);
        return total;
    }       
}

Poly 是一个以 int 数组作为参数的构造函数 (Poly ex = new Poly(new int[]{1, 2, 3}))

您可以定义一个目标数组，其长度为两个源数组的最大值。之后，您只需进行数组边界检查。当然，您还应该在开始循环之前添加对 null 的检查c.

import java.util.Arrays;

class AddArrays {
    private static int[] a = new int[] { 1, 2, 3 };
    private static int[] b = new int[] { 3, 2 };
    private static int[] c = add(a, b);

    private static int[] add(int[] a, int[] b) {
        int[] c = new int[(int) Math.max(a.length, b.length)];
        for (int i = 0; i < c.length; i++) {
            if (a.length > i) {
                c[i] += a[i];
            }
            if (b.length > i) {
                c[i] += b[i];
            }
        }
        return c;
    }

    public static void main (String[] args) {
        System.out.println(Arrays.toString(c));
    }
}

Output:

[4, 4, 3]