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Thread: Sorting and comparing errors.

  1. #1
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    Default Sorting and comparing errors.

    /*
    * To change this template, choose Tools | Templates
    * and open the template in the editor.
    */

    Main File

    public class Main {
     
        public static void main(String[] args){
             LibraryLab5 t = new LibraryLab5();
             LibraryLab5 p = new LibraryLab5();
             System.out.println("T: " + t.toString());
             System.out.println("t2: " + t.toString());
             System.out.println("T3: " + t.toString());
             LibraryLab5 []list = Time.getRandomArrayofTimes();
             Time.printArrayofTimes(list);
             System.out.println();
             LibraryLab5 [] tArray = Time.getRandomArrayofTimes();
             Time.displayArrayToScreen(tArray);
             Time.doFillArray();
            LibraryLab5.quickSort();
             Time.printArrayofTimes(tArray);
             System.out.println();
              if(list.compareTo(tArray) > 0)
                System.out.println("t is Greater");
            else if(list.compareTo(tArray) < 0)
                System.out.println("t is smaller");
            else
                System.out.println("They are the same");
     
     
    }
     
    }

    Time File

    import java.util.*;
    public class Time{
        public LibraryLab5 pink;
         static int tArray;
        public static LibraryLab5 [] getRandomArrayofTimes(){
        LibraryLab5 [] tArray = new LibraryLab5 [10];
            Random rand = new Random(System.currentTimeMillis());
            for(int i = 0; i < 10; i++){
                int k = rand.nextInt(999999999);
                 LibraryLab5 pink = new LibraryLab5(k);
                tArray[i] = pink;
            }
            return tArray;
        }
         public static int[] doFillArray() {
            int[] list = new int [12];
            Random rand = new Random(System.currentTimeMillis());
            for (int i = 0; i < 12; ++i) {
                int k = rand.nextInt(999999999);
            }
            return list;
        }
     
     public static <E> void displayArrayToScreen(E [] displayArray){
            System.out.println("The array contents are: ");
            for(int i = 0; i < displayArray.length; ++i ){
                System.out.println(displayArray[i]);
            }
    }
        public static void printArrayofTimes(LibraryLab5[] Array){
            for(int i = 0; i < Array.length; i++){
                System.out.println("Random Array: " + i + Array[i]);
            }
        }
    }

    My Library
    import java.util.Random;
    import java.util.*;
    public class LibraryLab5{ //implements Comparable
        private int minute;
        private int second;
        private int hour;
        public LibraryLab5(){
            this(System.currentTimeMillis());
        }
        public LibraryLab5(long elaspedTime)
        {
            long totalSeconds = elaspedTime / 1000L;
          this.second = (int)(totalSeconds % 60L);
          long totalMinutes = totalSeconds / 60L;
          this.minute = (int)(totalMinutes % 60L);
          int totalHours = (int)(totalMinutes/ 60L);
          this.hour = (totalHours % 24);
        }
        //muators
       public long getSeconds(){
           return second;
       }
       public long getMinutes(){
           return minute;
       }
       public long getHours(){
           return hour;
       }
        public static void quickSort(int [] Array){
           quickSort(Array, 0, Array.length - 1);
        }
        private static void quickSort(int [] Array, int first, int last){
                if(last > first){
            int pivotIndex = partition(Array, first, last);
            quickSort(Array, first, pivotIndex - 1);
            quickSort(Array, pivotIndex + 1, last );
            }
        }
    private static int partition(int [] list, int first, int last){
        int pivot = list[first];
        int low = first + 1;
        int high = last;
        while(high > low){
            while(low <= high && list[low] <= pivot)
                low++;
                while(low <= high && list[high] > pivot)
                high--;
                    if(high > low){
                int temp = list[high];
                list[high] = list[low];
                list[low] = temp;
    }
        }
        while(high > first && list[high]>= pivot)
            high--;
        if(pivot > list[high]){
            list[first] = list[high];
            list[high] = pivot;
            return high;
        }
        else{
            return first;
        }
    }
     
       public void displayTime(long totalHours, long totalMinutes, long totalSeconds){
             for(int i = 0; i < totalHours; i++){
                 for(int j = 0; j< totalMinutes; j++){
                     for(int k = 0; k < totalSeconds; k++){
                     }
                     System.out.print(hour + minute + second);
                 }
                 System.out.println();
             }
         }
       public double sumOfSquares(){
            double  sum = 0;
            for(int i = 0; i < hour ; i++){
                for(int j = 0; j < second; j++){
                    for(int g = 0; g < minute; g++) {
     
                sum += hour * minute * second;
            }
            }
     
           }
            return sum;
        }
     
     
       public int compareTo(Object M){
            //read compareTo method in text
            if(sumOfSquares() > ((LibraryLab5)M).sumOfSquares())
            return 1;
            else if(sumOfSquares() < ((LibraryLab5)M).sumOfSquares())
                return -1;
            else
                return 0;
        }
     
     
     
     
         public String toString(){
             String s;
             s = hour + " : " + minute + ": " + second + " GMT";
             return s;
         }
    }

    What I am trying to do is compare the random array of times, and sort it... but it's giving me errors, please help me.


  2. #2
    Super Moderator helloworld922's Avatar
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    Default Re: Sorting and comparing errors.

    What error are you getting? If there's an error message, please post it.

  3. #3
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    Default Re: Sorting and comparing errors.

    run:
    T: 0 : 46: 3 GMT
    t2: 0 : 46: 3 GMT
    T3: 0 : 46: 3 GMT
    Random Array: 09 : 38: 16 GMT
    Random Array: 12 : 59: 39 GMT
    Random Array: 211 : 42: 1 GMT
    Random Array: 312 : 4: 32 GMT
    Random Array: 423 : 6: 4 GMT
    Random Array: 510 : 17: 37 GMT
    Random Array: 614 : 5: 25 GMT
    Random Array: 70 : 34: 8 GMT
    Random Array: 80 : 37: 56 GMT
    Exception in thread "main" java.lang.RuntimeException: Uncompilable source code
    Random Array: 914 : 24: 42 GMT
     
    The array contents are: 
    9 : 38: 16 GMT
    2 : 59: 39 GMT
    11 : 42: 1 GMT
    12 : 4: 32 GMT
    23 : 6: 4 GMT
    10 : 17: 37 GMT
    14 : 5: 25 GMT
    0 : 34: 8 GMT
    0 : 37: 56 GMT
    14 : 24: 42 GMT
            at Main.main(Main.java:24)
    Java Result: 1
    BUILD SUCCESSFUL (total time: 1 second)

    That the error i get, and I have to sort these

  4. #4
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    Default Re: Sorting and comparing errors.

    Can't get the given code to compile.
    Issues with:

    LibraryLab5.quickSort()
    because the method requires a parameter, did you intend for the previous line to be used as a parameter?

    list.compareTo(tArray)
    list is an array... don't think you can call a class method on an array like this. the comment next to the class definition suggests that it should implement comparable, and to take a look at how to use it in your textbook.

    For further reading/examples on comparable: Object Ordering - Oracle Java Tutorials

    Hope this helps

  5. #5
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    Default Re: Sorting and comparing errors.

    I still don't get this.. please help me!

  6. #6
    Member vanDarg's Avatar
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    Default Re: Sorting and comparing errors.

    What don't you get? What logic are you having trouble conceptualizing? Simply posting your code and asking somebody the explain it is not the way it works. What are your errors? Where are the errors? What IDE (Integrated Development Environment) are you using? Explain what you are trying to do and what steps you have taken to complete them. What specific steps are you having trouble with?
    "Everything should be made as simple as possible, but not simpler."
    Asking Questions for Dummies | The Java Tutorials | Java Coding Styling Guide

  7. The Following User Says Thank You to vanDarg For This Useful Post:

    JavaPF (March 9th, 2011)

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