Java 计算一个双精度数组的和。
计算双精度数组的总和。
实例源码：
源代码：
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//package com.nowjava;4
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import java.util.List;//from n o w j a v a . c o m6
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public class Main {9
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public static void main(String[] argv) throws Exception {11
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double[] array = new double[] { 34.45, 35.45, 36.67, 37.78,13
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37.0000, 37.1234, 67.2344, 68.34534, 69.87700 };15
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System.out.println(sum(array));17
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}19
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/**22
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* Computes the sum of an array of doubles.24
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*26
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* @param array Array of doubles to be added up.28
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* @return Sum of the array.30
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*/32
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public static double sum(double[] array) {/**from n o w j a v a . c o m - 时 代 Java**/34
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double sum = 0;37
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for (double d : array) {39
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sum += d;41
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}43
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return sum;46
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}48
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/**51
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* Computes the sum of an array of integers.53
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*55
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* @param array Array of integers to be added up.57
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* @return Sum of the array.59
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*/61
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public static int sum(int[] array) {63
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int sum = 0;66
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for (int i : array) {68
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sum += i;70
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}72
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return sum;75
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}77
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/**80
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* Computes the sum of an array of floats.82
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*84
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* @param array Array of floats to be added up.86
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* @return Sum of the array.88
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*/90
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public static float sum(float[] array) {92
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int sum = 0;95
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for (float f : array) {97
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sum += f;99
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}101
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return sum;104
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}106
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/**109
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* Computes the sum of an array of longs.111
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*113
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* @param array Array of longs to be added up.115
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* @return Sum of the array.117
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*/119
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public static long sum(long[] array) {121
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long sum = 0;124
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for (long l : array) {126
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sum += l;128
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}130
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return sum;133
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}135
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/**138
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* Computes the sum of an array of bytes.140
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*142
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* @param array Array of bytes to be added up.144
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* @return Sum of the array.146
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*/148
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public static int sum(byte[] array) {150
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int sum = 0;153
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for (byte b : array) {155
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sum += b;157
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}159
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return sum;162
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}164
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/**167
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* Computes the sum of values in a matrix of integers.169
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*171
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* @param matrix Matrix of integers.173
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* @return Sum of the matrix values.175
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*/177
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public static int sum(int[][] matrix) {179
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int width = matrix.length;182
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int height = matrix[0].length;184
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int sum = 0;186
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for (int j = 0; j < width; j++) {189
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for (int i = 0; i < height; i++) {191
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sum += matrix[j][i];193
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}195
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}197
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return sum;200
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}203
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/**206
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* Computes the sum of values in a matrix of doubles.208
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*210
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* @param matrix Matrix of doubles.212
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* @return Sum of the matrix values.214
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*/216
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public static double sum(double[][] matrix) {218
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int width = matrix.length;221
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int height = matrix[0].length;223
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double sum = 0;225
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for (int j = 0; j < width; j++) {228
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for (int i = 0; i < height; i++) {230
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sum += matrix[j][i];232
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}234
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}236
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return sum;239
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}242
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/**245
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* Computes the sum of values in a matrix of longs.247
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*249
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* @param matrix Matrix of longs.251
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* @return Sum of the matrix values.253
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*/255
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public static long sum(long[][] matrix) {257
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int width = matrix.length;260
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int height = matrix[0].length;262
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long sum = 0;264
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for (int j = 0; j < width; j++) {267
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for (int i = 0; i < height; i++) {269
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sum += matrix[j][i];271
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}273
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}275
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return sum;278
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}281
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/**284
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* Computes the sum of values in a matrix of floats.286
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*288
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* @param matrix Matrix of floats.290
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* @return Sum of the matrix values.292
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*/294
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public static float sum(float[][] matrix) {296
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int width = matrix.length;299
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int height = matrix[0].length;301
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float sum = 0;303
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for (int j = 0; j < width; j++) {306
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for (int i = 0; i < height; i++) {308
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sum += matrix[j][i];310
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}312
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}314
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return sum;317
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}320
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/**323
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