Java 将数组设置为指定的长度，如有必要，可将开头部分刮除或填充。
将数组设置为指定的长度，如有必要，可将开头部分刮除或填充。
实例源码：
源代码：
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//package com.nowjava;/*from n o w j a v a . c o m*/4
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public class Main {7
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public static void main(String[] argv) throws Exception {9
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double[] data = new double[] { 34.45, 35.45, 36.67, 37.78, 37.0000,11
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37.1234, 67.2344, 68.34534, 69.87700 };13
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int length = 2;15
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System.out.println(java.util.Arrays.toString(setLengthFromEnd(data,17
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length)));19
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}21
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/**24
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* Sets an array to the specified length scraping or26
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* padding the beginning if necessary.28
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*/30
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public static double[] setLengthFromEnd(double[] data, int length) {32
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double[] ans = new double[length];34
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int debut;36
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if (length - data.length < 0)38
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debut = data.length - length;40
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else42
/*43
nowjava - 时 代 Java 提供44
*/45
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debut = 0;47
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System.arraycopy(data, debut, ans, -data.length + length + debut,49
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data.length - debut);51
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return (ans);53
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}55
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/**58
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* Sets an array to the specified length scraping or60
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* padding the beginning if necessary.62
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*/64
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public static int[] setLengthFromEnd(int[] data, int length) {66
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int[] ans = new int[length];68
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int debut;70
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if (length - data.length < 0)72
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debut = data.length - length;74
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else76
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debut = 0;78
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System.arraycopy(data, debut, ans, -data.length + length + debut,80
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data.length - debut);82
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return (ans);84
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}86
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/**89
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* Returns a comma delimited string representing the value of the array.91
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*/93
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public static String toString(double[] array) {95
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StringBuffer buf = new StringBuffer(array.length);98
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int i;100
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for (i = 0; i < array.length - 1; i++) {102
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buf.append(array[i]);104
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buf.append(',');106
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}108
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buf.append(array[i]);110
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return buf.toString();112
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}114
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/**117
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* Returns a comma delimited string representing the value of the array.119
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*/121
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public static String toString(double[][] array) {123
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StringBuffer buf = new StringBuffer();125
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for (int k = 0; k < array.length; k++) {127
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buf.append(toString(array[k]));129
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buf.append(System.getProperty("line.separator"));131
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}133
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return buf.toString();135
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}137
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/**140
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* Returns a comma delimited string representing the value of the array.142
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*/144
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public static String toString(int[] array) {146
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StringBuffer buf = new StringBuffer(array.length);148
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int i;150
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for (i = 0; i < array.length - 1; i++) {152
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buf.append(array[i]);154
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buf.append(',');156
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}158
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