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添加到数组w，a乘以v，其中a是标量。
//package com.nowjava; /*来自 N o w J a v a . c o m*/ public class Main { public static void main(String[] argv) throws Exception { double[] w = new double[] { 34.45, 35.45, 36.67, 37.78, 37.0000, 37.1234, 67.2344, 68.34534, 69.87700 }; double a = 2.45678; System.out.println(java.util.Arrays.toString(add(w, a))); } /** * Adds to an array w, a times v where a is a scalar. * Since v can be smaller then w, we must specified the position at which v will be added. * * @param a scalar. * @param p position. */ public static double[] add(double[] w, double a, double[] v, int p) { if (v.length > w.length) { throw new IllegalArgumentException( "Second array must be shorter or equal to the first one : " + w.length + ", " + v.length); } double[] ans = copy(w);/*来自 NowJava.com - 时代Java*/ for (int k = p; k < p + v.length; k++) { ans[k] += a * v[k - p]; } return (ans); } /** * Adds a scalar to every element in the array. */ public static double[] add(double[] w, double a) { double[] ans = copy(w); for (int k = 0; k < ans.length; k++) { ans[k] += a; } return (ans); } /** * Adds the two arrays together (componentwise). * * @throws IllegalArgumentException if the * two arrays don't have the same length. */ public static double[] add(double[] a, double[] b) { if (a.length != b.length) { throw new IllegalArgumentException( "To add two arrays, they must have the same length : " + a.length + ", " + b.length); } double[] ans = copy(a); for (int i = 0; i < a.length; i++) { ans[i] += b[i]; } return (ans); } /** * Adds to an array w, a times v where a is a scalar. * Since v can be smaller then w, we must specified the position at which v will be added. * * @param a scalar. * @param p position. * @param w longer array. * @param v shorter array. * @throws IllegalArgumentException if the second array * is not shorter than the first one. */ public static int[] add(int[] w, double a, int[] v, int p) { if (v.length > w.length) { throw new IllegalArgumentException( "Second array must be shorter or equal to the first one : " + w.length + ", " + v.length); } int[] ans = copy(w); for (int k = p; k < p + v.length; k++) { ans[k] += a * v[k - p]; } return (ans); } /** * Adds a scalar to every element in the array. */ public static int[] add(int[] w, int a) { int[] ans = copy(w); for (int k = 0; k < ans.length; k++) { ans[k] += a; } return (ans); } /** * Adds the two arrays together (componentwise). * * @throws IllegalArgumentException if the * two arrays don't have the same length. */ public static int[] add(int[] a, int[] b) { if (a.length != b.length) { throw new IllegalArgumentException( "To add two arrays, they must have the same length : " + a.length + ", " + b.length); } int[] ans = copy(a); for (int i = 0; i < a.length; i++) { ans[i] += b[i]; } return (ans); } /** * Returns a comma delimited string representing the value of the array. */ public static String toString(double[] array) { StringBuffer buf = new StringBuffer(array.length); int i; for (i = 0; i < array.length - 1; i++) { buf.append(array[i]); buf.append(','); } buf.append(array[i]); return buf.toString(); } /** * Returns a comma delimited string representing the value of the array. */ public static String toString(double[][] array) { StringBuffer buf = new StringBuffer(); for (int k = 0; k < array.length; k++) { buf.append(toString(array[k])); buf.append(System.getProperty("line.separator")); } return buf.toString(); } /** * Returns a comma delimited string representing the value of the array. */ public static String toString(int[] array) { StringBuffer buf = new StringBuffer(array.length); int i; for (i = 0; i < array.length - 1; i++) { buf.append(array[i]); buf.append(','); } buf.append(array[i]); return buf.toString(); } /** * Returns a comma delimited string representing the value of the array. */ public static String toString(int[][] array) { StringBuffer buf = new StringBuffer(); for (int k = 0; k < array.length; k++) { buf.append(toString(array[k])); buf.append(System.getProperty("line.separator")); } return buf.toString(); } /** * Returns a copy of the array. */ //a call to array.clone() may also work although this is a primitive type. I haven't checked //it even may be faster public static int[] copy(int[] array) { int[] result; result = new int[array.length]; System.arraycopy(array, 0, result, 0, array.length); return result; } /** * Returns a copy of the array. */ //a call to array.clone() may also work although this is a primitive type. I haven't checked //it even may be faster public static long[] copy(long[] array) { long[] result; result = new long[array.length]; System.arraycopy(array, 0, result, 0, array.length); return result; } /** * Returns a copy of the array. */ //a call to array.clone() may also work although this is a primitive type. I haven't checked //it even may be faster public static float[] copy(float[] array) { float[] result; result = new