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将第二个数组中的值添加到第一个数组中，并在可能的情况下重用第一个数组。结果将扩展为适合任一数组中最大数组元素的数量
/** 时代Java - nowjava.com 提 供 **/ //package com.nowjava; import java.util.Arrays; public class Main { public static void main(String[] argv) throws Exception { int[] first = new int[] { 34, 35, 36, 37, 37, 37, 67, 68, 69 }; int[] second = new int[] { 34, 35, 36, 37, 37, 37, 67, 68, 69 }; System.out.println(java.util.Arrays.toString(add(first, second))); } private static int[] EMPTY_INT_ARRAY = new int[0]; private static float[] EMPTY_FLOAT_ARRAY = new float[0]; /** * Adds the values from the second array to the first, * reusing the first array if possible * The result will be expanded to fit the maximum number of array elements in either array */ public static int[] add(int[] first, int[] second) { if (first == null && second == null) return EMPTY_INT_ARRAY; if (second == null) return first; if (first == null) /* 来自 *时代Java公众号 - N o w J a v a . c o m*/ return Arrays.copyOf(second, second.length); if (first.length < second.length) { first = Arrays.copyOf(first, second.length); } int nOverlap = Math.min(first.length, second.length); for (int i = 0; i < nOverlap; i++) { first[i] += second[i]; } return first; } /** * Adds the values from the second array to the first, * reusing the first array if possible * The result will be expanded to fit the maximum number of array elements in either array */ public static float[] add(float[] first, float[] second) { if (first == null && second == null) return EMPTY_FLOAT_ARRAY; if (second == null) return first; if (first == null) return Arrays.copyOf(second, second.length); if (first.length < second.length) { first = Arrays.copyOf(first, second.length); } int nOverlap = Math.min(first.length, second.length); for (int i = 0; i < nOverlap; i++) { first[i] += second[i]; } return first; }