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Java 将数组设置为指定的长度，必要时刮除或填充结尾。
将数组设置为指定的长度，必要时刮除或填充结尾。
实例源码：
源代码：
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//package com.nowjava;4
/* from nowjava - 时 代 Java*/5
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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.Arrays17
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.toString(setLengthFromBeginning(data, 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 end if necessary.28
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*/30
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public static double[] setLengthFromBeginning(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
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debut = 0;44
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System.arraycopy(data, 0, ans, 0, data.length - debut);/*来 自 n o w j a v a . c o m - 时 代 Java*/46
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return (ans);48
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}50
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/**53
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* Sets an array to the specified length scraping or55
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* padding the end if necessary.57
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*/59
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public static int[] setLengthFromBeginning(int[] data, int length) {61
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int[] ans = new int[length];63
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int debut;65
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if (length - data.length < 0)67
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debut = data.length - length;69
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else71
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debut = 0;73
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System.arraycopy(data, 0, ans, 0, data.length - debut);75
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return (ans);77
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}79
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/**82
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* Returns a comma delimited string representing the value of the array.84
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*/86
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public static String toString(double[] array) {88
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StringBuffer buf = new StringBuffer(array.length);91
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int i;93
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for (i = 0; i < array.length - 1; i++) {95
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buf.append(array[i]);97
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buf.append(',');99
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}101
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buf.append(array[i]);103
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return buf.toString();105
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}107
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/**110
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* Returns a comma delimited string representing the value of the array.112
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*/114
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public static String toString(double[][] array) {116
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StringBuffer buf = new StringBuffer();118
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for (int k = 0; k < array.length; k++) {120
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buf.append(toString(array[k]));122
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buf.append(System.getProperty("line.separator"));124
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}126
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return buf.toString();128
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}130
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/**133
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* Returns a comma delimited string representing the value of the array.135
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*/137
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public static String toString(int[] array) {139
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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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