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将两个数组相减（明智的方式）
// 来自 n o w j a v a . c o m - 时代Java //package com.nowjava; public class Main { public static void main(String[] argv) throws Exception { double[] a = new double[] { 34.45, 35.45, 36.67, 37.78, 37.0000, 37.1234, 67.2344, 68.34534, 69.87700 }; double[] b = new double[] { 34.45, 35.45, 36.67, 37.78, 37.0000, 37.1234, 67.2344, 68.34534, 69.87700 }; System.out.println(java.util.Arrays.toString(subtract(a, b))); } /** * Subtracts the two arrays together (componentwise) * * @throws IllegalArgumentException if the * two arrays don't have the same length. */ public static double[] subtract(double[] a, double[] b) { if (a.length != b.length) { throw new IllegalArgumentException( "To add two arrays, they must have the same length : " /* from n o w j a v a . c o m */ + a.length + ", " + b.length); } double[] ans = copy(a); for (int i = 0; i < a.length; i++) { ans[i] -= b[i]; } return (ans); } /** * Subtracts the two arrays together (componentwise). * * @throws IllegalArgumentException if the * two arrays don't have the same length. */ public static int[] subtract(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 float[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