APCS/05 Collections _ Generics/02 SortingGenerically/SortingGenerically.java

// Name: B6-24
// Date: 12/6/19

import java.io.*;      //the File class
import java.util.*;    //ArrayList & the Scanner class in Java 1.5
 
public class SortingGenerically
{
   public static void main(String[] args) throws Exception
   {
      //Widgets
      List<Comparable> apple = inputWidgets("widgets.txt");
      sort(apple);
      output(apple);
      System.out.println("There are " + apple.size() +" widgets, sorted.");
      
      //Strings
      List<Comparable> strList = inputStrings("strings.txt");
      sort(strList);
      output(strList);
      System.out.println("There are " + strList.size() +" strings, alphabetized.");
   }
   
   public static List<Comparable> inputStrings(String filename) throws Exception
   {
   Scanner sc;
    try {
      sc = new Scanner(new File(filename));
    } 
    catch (FileNotFoundException e) {
        return null;
    }
    
    List<Comparable> list = new ArrayList<>();
    
    while (sc.hasNextLine()) {
      String[] strings = sc.nextLine().split(" ");
      for (String s : strings)
         list.add(s);
    }
    return list;
   }
   
   public static List<Comparable> inputWidgets(String filename) throws Exception
   {
         Scanner sc;
    try {
      sc = new Scanner(new File(filename));
    } 
    catch (FileNotFoundException e) {
        return null;
    }
    
    List<Comparable> list = new ArrayList<>();
    
    while (sc.hasNextLine()) {
      list.add(new Widget(Integer.parseInt(sc.nextLine()), Integer.parseInt(sc.nextLine())));
    }
    
    return list;
   }
	
   /*  these methods are all GENERIC   */
   public static <T extends Comparable<T>> void sort(List<T> array)
   {
      for (int upper = array.size() - 1; 0 <= upper; upper--)
         swap(array, findMax(array, upper), upper);
   } 
   public static <T extends Comparable<T>> int findMax(List<T> array, int upper)
   {
      T max = array.get(0);
      int index = 0;
      for(int i = 0; i <= upper; i++) {
         if (array.get(i).compareTo(max) > 0) {
            max = array.get(i);
            index = i;
         }
      }
      
      return index;
   }
   
   public static <T> void swap(List<T> array, int a, int b)
   {
      T temp = array.get(a);
      array.set(a, array.get(b));
      array.set(b, temp);
   }  
   
   public static <T> void output(Collection<T> array)
   {
      Iterator i = array.iterator();
      while (i.hasNext())
         System.out.println(i.next());
      
   }
}

/*************************************
 0 cubits 14 hands
 1 cubits 3 hands
 2 cubits 14 hands
 5 cubits 14 hands
 10 cubits 14 hands
 11 cubits 11 hands
 12 cubits 0 hands
 12 cubits 7 hands
 13 cubits 9 hands
 15 cubits 12 hands
 17 cubits 5 hands
 18 cubits 13 hands
 19 cubits 13 hands
 19 cubits 13 hands
 22 cubits 6 hands
 23 cubits 7 hands
 24 cubits 15 hands
 24 cubits 15 hands
 26 cubits 2 hands
 28 cubits 5 hands
 28 cubits 12 hands
 29 cubits 15 hands
 31 cubits 0 hands
 32 cubits 1 hands
 32 cubits 11 hands
 32 cubits 11 hands
 32 cubits 12 hands
 35 cubits 3 hands
 39 cubits 2 hands
 39 cubits 5 hands
 41 cubits 10 hands
 43 cubits 2 hands
 43 cubits 5 hands
 43 cubits 6 hands
 51 cubits 2 hands
 54 cubits 14 hands
 55 cubits 8 hands
 56 cubits 3 hands
 57 cubits 12 hands
 62 cubits 15 hands
 63 cubits 0 hands
 64 cubits 13 hands
 67 cubits 3 hands
 70 cubits 0 hands
 73 cubits 5 hands
 74 cubits 7 hands
 75 cubits 9 hands
 81 cubits 5 hands
 85 cubits 14 hands
 86 cubits 3 hands
 90 cubits 13 hands
 91 cubits 3 hands
 92 cubits 1 hands
 92 cubits 8 hands
 96 cubits 1 hands
 98 cubits 8 hands
 99 cubits 5 hands
 There are 57 widgets, sorted.
 APCS
 Encapsulation
 Exam
 Generics
 Inheritance
 Java
 Method
 OOP
 Object
 Oriented
 Polymorphism
 Programming
 There are 12 strings, alphabetized.   ****************************************/