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Merge pull request HarryDulaney#33 from HarryDulaney/Add_Chapter_22_23_24_25_answers
Add Exercise 23 06
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‎ch_23/Exercise23_06.java

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package ch_23;
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import java.util.Arrays;
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import java.util.Comparator;
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/**
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* 23.6 (Check order) Write the following overloaded methods that check whether an
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* array is ordered in ascending order or descending order. By default, the method
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* checks ascending order. To check descending order, pass false to the ascending
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* argument in the method.
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* public static boolean ordered(int[] list)
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* public static boolean ordered(int[] list, boolean ascending)
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* public static boolean ordered(double[] list)
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* public static boolean ordered
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* (double[] list, boolean ascending)
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* public static <E extends Comparable<E>>
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* boolean ordered(E[] list)
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* public static <E extends Comparable<E>> boolean ordered
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* (E[] list, boolean ascending)
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* public static <E> boolean ordered(E[] list, Comparator<? super E> comparator)
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* public static <E> boolean ordered(E[] list, Comparator<? super E> comparator, boolean ascending)
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*/
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public class Exercise23_06 {
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/**
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* Test Driver method
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*/
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public static void main(String[] args) {
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/* Test int[] */
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int[] listAsc = {1, 2, 3, 4, 7, 9, 11, 27};
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int[] listDesc = {27, 26, 23, 14, 11, 9, 6, 3, 2, 1};
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System.out.print("listAsc = ");
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System.out.print(Arrays.toString(listAsc));
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System.out.println();
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System.out.print("listDesc = ");
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System.out.print(Arrays.toString(listDesc));
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System.out.println();
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System.out.println("listAsc, is ascending?: " + ordered(listAsc));
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System.out.println("listDesc, is descending? " + ordered(listDesc, false));
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System.out.println("listDesc, is ascending?: " + ordered(listDesc));
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System.out.println("listAsc, is descending? " + ordered(listAsc, false));
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/* Test double[] */
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double[] listAscDoubles = {1.3, 2.1, 3.2, 3.4, 3.7, 3.9, 11.21, 27.54};
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double[] listDescDoubles = {27.6, 26.1, 23.3, 14.3, 11.54, 3.9, 3.6, 3.3, 3.2, 3.1};
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System.out.print("listAscDoubles = ");
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System.out.print(Arrays.toString(listAscDoubles));
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System.out.println();
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System.out.print("listDescDoubles = ");
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System.out.print(Arrays.toString(listDescDoubles));
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System.out.println();
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System.out.println("listAscDoubles, is ascending?: " + ordered(listAscDoubles));
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System.out.println("listDescDoubles, is descending? " + ordered(listDescDoubles, false));
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System.out.println("listDescDoubles, is ascending?: " + ordered(listDescDoubles));
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System.out.println("listAscDoubles, is descending? " + ordered(listAscDoubles, false));
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/* Test E[] where E implements Comparable */
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Integer[] listAscInteger = {1, 2, 3, 4, 7, 9, 11, 27};
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Integer[] listDescInteger = {27, 26, 23, 14, 11, 9, 6, 3, 2, 1};
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System.out.print("listAscInteger = ");
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System.out.print(Arrays.toString(listAscInteger));
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System.out.println();
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System.out.print("listDescInteger = ");
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System.out.print(Arrays.toString(listDescInteger));
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System.out.println();
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System.out.println("listAscInteger, is ascending?: " + ordered(listAscInteger));
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System.out.println("listDescInteger, is descending? " + ordered(listDescInteger, false));
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System.out.println("listDescInteger, is ascending?: " + ordered(listDescInteger));
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System.out.println("listAscInteger, is descending? " + ordered(listAscInteger, false));
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/* Test E[] using Comparator */
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Integer[] listAscWithComparator = {1, 2, 3, 4, 7, 9, 11, 27};
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Integer[] listDescWithComparator = {27, 26, 23, 14, 11, 9, 6, 3, 2, 1};
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System.out.print("listAscWithComparator = ");
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System.out.print(Arrays.toString(listAscWithComparator));
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System.out.println();
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System.out.print("listDescWithComparator = ");
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System.out.print(Arrays.toString(listDescWithComparator));
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System.out.println();
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System.out.println("listAscWithComparator, is ascending?: " + ordered(listAscWithComparator,
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(o1, o2) -> {
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if (o1 > o2) return 1;
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if (o1 < o2) return -1;
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return 0;
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}));
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System.out.println("listDescWithComparator, is descending? " + ordered(listDescWithComparator, (o1, o2) -> {
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if (o1 > o2) return 1;
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if (o1 < o2) return -1;
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return 0;
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}, false));
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System.out.println("listDescWithComparator, is ascending?: " + ordered(listDescWithComparator, (o1, o2) -> {
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if (o1 > o2) return 1;
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if (o1 < o2) return -1;
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return 0;
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}));
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System.out.println("listAscWithComparator, is descending? " + ordered(listAscWithComparator, (o1, o2) -> {
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if (o1 > o2) return 1;
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if (o1 < o2) return -1;
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return 0;
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}, false));
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}
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public static boolean ordered(int[] list) {
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for (int i = 0; i < list.length - 1; i++) {
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if (list[i] > list[i + 1]) return false;
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}
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return true;
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}
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public static boolean ordered(int[] list,
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boolean ascending) {
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if (!ascending) {
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for (int i = 0; i < list.length - 1; i++) {
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if (list[i] < list[i + 1]) return false;
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}
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return true;
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}
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for (int i = 0; i < list.length - 1; i++) {
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if (list[i] > list[i + 1]) return false;
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}
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return true;
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}
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public static boolean ordered(double[] list) {
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for (int i = 0; i < list.length - 1; i++) {
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if (list[i] > list[i + 1]) return false;
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}
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return true;
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}
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public static boolean ordered(double[] list,
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boolean ascending) {
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if (!ascending) {
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for (int i = 0; i < list.length - 1; i++) {
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if (list[i] < list[i + 1]) return false;
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}
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return true;
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}
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for (int i = 0; i < list.length - 1; i++) {
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if (list[i] > list[i + 1]) return false;
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}
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return true;
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}
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public static <E extends Comparable<E>> boolean ordered(E[] list) {
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for (int i = 0; i < list.length - 1; i++) {
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if (list[i].compareTo(list[i + 1]) > 0) return false;
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}
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return true;
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}
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public static <E extends Comparable<E>> boolean ordered(
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E[] list,
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boolean ascending) {
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if (!ascending) {
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for (int i = 0; i < list.length - 1; i++) {
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if (list[i].compareTo(list[i + 1]) < 0) return false;
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}
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return true;
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}
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for (int i = 0; i < list.length - 1; i++) {
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if (list[i].compareTo(list[i + 1]) > 0) return false;
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}
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return true;
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}
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public static <E> boolean ordered(E[] list,
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Comparator<? super E> comparator) {
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for (int i = 0; i < list.length - 1; i++) {
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if (comparator.compare(list[i], list[i + 1]) > 0) return false;
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}
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return true;
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}
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public static <E> boolean ordered(E[] list,
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Comparator<? super E> comparator,
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boolean ascending) {
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if (!ascending) {
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for (int i = 0; i < list.length - 1; i++) {
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if (comparator.compare(list[i], list[i + 1]) < 0) return false;
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}
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return true;
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}
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for (int i = 0; i < list.length - 1; i++) {
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if (comparator.compare(list[i], list[i + 1]) > 0) return false;
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}
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return true;
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}
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}

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