如何添加两个不同大小的数组？ [英] How to add two different sized arrays?

问题描述

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 I have an array int[] a = new int[]{1, 2, 3}; and another int[] b = new int[]{3, 2}; and I want to add the two together, I would do:

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，得到{4，4}和3最后被排除在外，我在哪里错了？

But when I print c, I get {4, 4} and the 3 on the end is left out, where am I going wrong?

在此先感谢您的帮助！

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是一个构造函数，它使用int数组作为一个参数（ Poly ex = new Poly（new int [] {1，2，3}））

and Poly is a constructor that takes an int array as an argument (Poly ex = new Poly(new int[]{1, 2, 3}))

推荐答案

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，您只需要进行数组边界检查即可。当然，在开始循环 c 之前，还应该添加null检查。

You can define a destination array with a length of the max of both source arrays. After that you just do array bounds-checking. Of course, you should also add checks for null before you even begin to loop over 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));
    }
}

输出：

[4, 4, 3]

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