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将数组设置为指定的长度，必要时刮除或填充结尾。
//package com.nowjava; /* from nowjava - 时 代 Java*/ public class Main { public static void main(String[] argv) throws Exception { double[] data = new double[] { 34.45, 35.45, 36.67, 37.78, 37.0000, 37.1234, 67.2344, 68.34534, 69.87700 }; int length = 2; System.out.println(java.util.Arrays .toString(setLengthFromBeginning(data, length))); } /** * Sets an array to the specified length scraping or * padding the end if necessary. */ public static double[] setLengthFromBeginning(double[] data, int length) { double[] ans = new double[length]; int debut; if (length - data.length < 0) debut = data.length - length; else debut = 0; System.arraycopy(data, 0, ans, 0, data.length - debut);/*来 自 n o w j a v a . c o m - 时 代 Java*/ return (ans); } /** * Sets an array to the specified length scraping or * padding the end if necessary. */ public static int[] setLengthFromBeginning(int[] data, int length) { int[] ans = new int[length]; int debut; if (length - data.length < 0) debut = data.length - length; else debut = 0; System.arraycopy(data, 0, ans, 0, data.length - debut); 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(',');