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Thread: Help with sorting numbers

  1. #1
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    Default Help with sorting numbers

    My goal is to generate 10,000 random numbers and sort them in arrays. I have the random numbers made easy enough and I have a small quick sort class but I am having trouble combining the two.

    This is the random number generator
    import java.util.*;
     
     
     
    public class NumberGenerator {
    	public static void main(String args[]){
    	Random Generator = new Random();
     
    	int[] myArray = new int[10000];
     
    	for(int idx = 0;idx <=10000; ++idx){
    	    int nums = Generator.nextInt(10000);
    	    myArray[idx] = nums;
     
    	}

    This is the quick sort

    public class QuickSort {
     
     
     
    	int partition(int array[], int left, int right)
    	{
     
    		 int i = left, j = right;
    	     int tmp;
    	     int pivot = array[(left + right) / 2];
     
    	     while (i <= j) {
    	            while (array[i] < pivot)
    	                  i++;
    	            while (array[j] > pivot)
    	                  j--;
    	            if (i <= j) {
    	                  tmp = array[i];
    	                  array[i] = array[j];
    	                  array[j] = tmp;
    	                  i++;
    	                  j--;
    	            }
    	      };
     
    	      return i;
    	}
     
    	void quickSort(int array[], int left, int right) {
    	      int index = partition(array, left, right);
    	      if (left < index - 1)
    	            quickSort(array, left, index - 1);
    	      if (index < right)
    	            quickSort(array, index, right);
    	}
    }

    Thanks for your help


  2. #2
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    Default Re: Help with sorting numbers

    Is this for class and you have to make your own sort?

    If not, you can simply say:
    Arrays.sort(myArray);
    and your array will be sorted.
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  3. #3
    Super Moderator Norm's Avatar
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    Default Re: Help with sorting numbers

    having trouble combining the two
    Are you asking how to call a method in one class from a method in another class?

    One way is shown in post#2. Define the method to be called as static.
    The other way is to create an instance of the object and use that to call the method.

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