如何将随机值从一种方法提取到另一种方法？

Question

long story short. im supposed to write a program with a single-dimension array that holds 10 integer numbers and sort the array using a bubble sort.

now so far I have written:

System.out.print("The unsorted list is: ");
         int[] numbers = new int[10];       
            //Generates 10 Random Numbers in the range 1 -100
            for(int i = 0; i < numbers.length; i++) {
              numbers[i] = (int)(Math.random() * 100 + 1);
              System.out.print(numbers[i] + " " );
           }//end for loop

but i dont clearly understand how to pass random values from one method to another. the proffesor was kind enough to include a bubble sort code, but im not enterely clear on how its supposed to pull random values from the array in the main method.

the bubblesort code:

 public static void bubbleSort(int[] list) 
      {
        int temp;

          for (int i = list.length - 1; i > 0; i--) 
          {
             for (int j = 0; j < i; j++) 
             {
               if (list[j] > list[j + 1]) 
               {
               temp = list[j];
               list[j] = list[j + 1];
               list[j + 1] = temp;
               }
             }
          }
       }

any tips or help is greatly apreciated.

Answer 1

The function

public static void bubbleSort(int[] list)

is expecting int[] list an integer array as parameter, So you pass an integer array.

public static void main(String args[]){
   int[] mList = {12,3,54,67,8,90};
   bubbleSort(mList);
   for(int i = 0 ; i < mList.length ; i++)
      System.out.println(mList[i] + ", ");
}

Just so you know, notice that void main(String[] args) also expects an array (String array) as arguments.

Also since the argument int[] list is a non primitive (ie. not a plain int, float, char, or their wrapper Object), the arguments are received as reference not values. And so whatever modification is done in the array will be reflected in the main function also.

Answer 2

Use it like this:

System.out.print("The unsorted list is: ");
         int[] numbers = new int[10];  
               bubbleSort(numbers);
            //Generates 10 Random Numbers in the range 1 -100
            for(int i = 0; i < numbers.length; i++) {
              numbers[i] = (int)(Math.random() * 100 + 1);
              System.out.print(numbers[i] + " " );
           }//end for loop

 public static void bubbleSort(int[] list) 
      {
        int temp;

          for (int i = list.length - 1; i > 0; i--) 
          {
             for (int j = 0; j < i; j++) 
             {
               if (list[j] > list[j + 1]) 
               {
               temp = list[j];
               list[j] = list[j + 1];
               list[j + 1] = temp;
               }
             }
          }
       }