Java 提取子对象
提取子数组
实例源码：
源代码：
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/*2
from nowjava.com - 时代Java 3
*/4
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//package com.nowjava;7
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public class Main {10
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public static void main(String[] argv) throws Exception {12
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int k0 = 2;14
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int k1 = 2;16
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double[] invect = new double[] { 34.45, 35.45, 36.67, 37.78,18
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37.0000, 37.1234, 67.2344, 68.34534, 69.87700 };20
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System.out.println(java.util.Arrays22
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.toString(extract(k0, k1, invect)));24
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}26
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/**29
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* Extracts a sub-array (will invert the resulting array if k0 > k1).31
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*33
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* @param k0 location of the first component35
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* @param k1 location of the last component37
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*/39
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public static double[] extract(int k0, int k1, double[] invect) {41
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if ((k0 < 0) || (k1 < 0) || (k0 > invect.length - 1)43
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|| (k1 > invect.length - 1)) {45
/**46
来 自 时代Java公众号 - nowjava.com47
**/48
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throw new IllegalArgumentException(50
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"The parameters are incorrect : " + k0 + ", " + k152
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+ ", " + invect.length);54
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}56
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if (k1 > k0) {58
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double[] ans = new double[k1 - k0 + 1];60
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System.arraycopy(invect, k0, ans, 0, k1 - k0 + 1);62
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return (ans);64
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}66
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double[] ans = new double[-k1 + k0 + 1];68
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for (int k = k1; k <= k0; k++) {70
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ans[k0 - k] = invect[k];72
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}74
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return (ans);76
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}78
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/**81
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* Extracts a sub-array (will invert the83
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* resulting array if k0 > k1).85
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*87
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* @param k0 location of the first component.89
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* @param k1 location of the last component.91
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*/93
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public static int[] extract(int k0, int k1, int[] invect) {95
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if ((k0 < 0) || (k1 < 0) || (k0 > invect.length - 1)97
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|| (k1 > invect.length - 1)) {99
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throw new IllegalArgumentException(101
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"The parameters are incorrect : " + k0 + ", " + k1103
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+ ", " + invect.length);105
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}107
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if (k1 > k0) {109
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int[] ans = new int[k1 - k0 + 1];111
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System.arraycopy(invect, k0, ans, 0, k1 - k0 + 1);113
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return (ans);115
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}117
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int[] ans = new int[-k1 + k0 + 1];119
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for (int k = k1; k <= k0; k++) {121
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ans[k0 - k] = invect[k];123
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}125
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return (ans);127
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}129
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/**132
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* Returns a comma delimited string representing the value of the array.134
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*/136
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public static String toString(double[] array) {138
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StringBuffer buf = new StringBuffer(array.length);141
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int i;143
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for (i = 0; i < array.length - 1; i++) {145
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buf.append(array[i]);147
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buf.append(',');149
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}151
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buf.append(array[i]);153
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return buf.toString();155
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}157
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/**160
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* Returns a comma delimited string representing the value of the array.162
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*/164
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public static String toString(double[][] array) {166
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StringBuffer buf = new StringBuffer();168
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for (int k = 0; k < array.length; k++) {170
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buf.append(toString(array[k]));172
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buf.append(System.getProperty("line.separator"));174
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}176
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return buf.toString();178
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}180
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/**183
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* Returns a comma delimited string representing the value of the array.185
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*/187
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public static String toString(int[] array) {189
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StringBuffer buf = new StringBuffer(array.length);191
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int i;193
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