提示：您可在线编辑运行本教程的实例 - 运行实例，去试试！
提取子数组
/* from nowjava.com - 时代Java */ //package com.nowjava; public class Main { public static void main(String[] argv) throws Exception { int k0 = 2; int k1 = 2; double[] invect = new double[] { 34.45, 35.45, 36.67, 37.78, 37.0000, 37.1234, 67.2344, 68.34534, 69.87700 }; System.out.println(java.util.Arrays .toString(extract(k0, k1, invect))); } /** * Extracts a sub-array (will invert the resulting array if k0 > k1). * * @param k0 location of the first component * @param k1 location of the last component */ public static double[] extract(int k0, int k1, double[] invect) { if ((k0 < 0) || (k1 < 0) || (k0 > invect.length - 1) || (k1 > invect.length - 1)) { /** 来 自 时代Java公众号 - nowjava.com **/ throw new IllegalArgumentException( "The parameters are incorrect : " + k0 + ", " + k1 + ", " + invect.length); } if (k1 > k0) { double[] ans = new double[k1 - k0 + 1]; System.arraycopy(invect, k0, ans, 0, k1 - k0 + 1); return (ans); } double[] ans = new double[-k1 + k0 + 1]; for (int k = k1; k <= k0; k++) { ans[k0 - k] = invect[k]; } return (ans); } /** * Extracts a sub-array (will invert the * resulting array if k0 > k1). * * @param k0 location of the first component. * @param k1 location of the last component. */ public static int[] extract(int k0, int k1, int[] invect) { if ((k0 < 0) || (k1 < 0) || (k0 > invect.length - 1) || (k1 > invect.length - 1)) { throw new IllegalArgumentException( "The parameters are incorrect : " + k0 + ", " + k1 + ", " + invect.length); } if (k1 > k0) { int[] ans = new int[k1 - k0 + 1]; System.arraycopy(invect, k0, ans, 0, k1 - k0 + 1); return (ans); } int[] ans = new int[-k1 + k0 + 1]; for (int k = k1; k <= k0; k++) { ans[k0 - k] = invect[k]; } 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