Joining arrays in method and returning

Question

Hellp guys.

Im trying to do this following example.

What this program does, is that it joins and sorts two lists in the merge-method, and returns it to the main method.

however I'm running into issues while trying to work inside my method!

--> merge(int[],int) in Exercise07_31 cannot be applied to (int[],int[]) --> Exercise07_31.java:62: int cannot be dereferenced

and a bunch of more errors...

I don't seem to figure out where the error occurs, it should really be one little thing that i forgot. Isn't arrays integers, if so, how do i convert them and use them right ?

Can anyone please help me out? Thanks!

import java.util.*;

public class Exercise07_31
{
  public static void main(String[] args)
  {

     Scanner input = new Scanner(System.in);

     //Prompt for user input list 1:

     System.out.print("Enter list1: ");
     int a1 = input.nextInt();

     //Set array:
     int[] list1 = new int[a1];

     //Prompt for array input:
     for (int k = 0; k < a1; k++)
     {
     list1[k] = input.nextInt();;      
     }

     //Prompt for user input list 2: 

     System.out.print("Enter list2: ");
     int a2 = input.nextInt();

     //Set array
     int[] list2 = new int[a2];

     //Prompt for array input
     for (int j = 0; j < a2; j++)
     {
     list2[j] = input.nextInt();;      
     }     

     System.out.println("The merged list is ");

     for (int l = 0; l < a3; l++) 
     {
     System.out.print(merge(list1, list2) + ", ");
     }

}

public static int[] merge(int[] list1, int list2)

{

     int a3 = list1.length + list2.length;

     //Creating array for join:
     int[] list3 = new int[a3];

     //join the lists to list3

     for (int s = 0; s < list1.length; s++)
     {
     list3[s] = list1[s];
     }
     for (int h = 0; h < list2.length; h++)
     {
     list3[list1.length + h] = list2[h];
     }


     //Sort the lists:


     int temp = 0; 
     for (int j = 0; j < list3.length; j++)
     {

     for (int k = 0; k < list3.length - 1; k++)
     {
       if(list3[k + 1] < list3[k])
       {
       temp = list3[k];
       list3[k] = list3[k + 1];
       list3[k + 1] = temp;
       }   
     }
     }
     return list3;
}
}

Change merge(int[], int) to merge(int[], int[]) – g7k Oct 30 '14 at 23:48 — g7k, Oct 30 '14 at 23:48

score 0 · Accepted Answer · answered Oct 30 '14 at 23:47

0

merge(int[] list1, int list2)

accepts an array as its first parameter (int[]) and a single int as the second. You want it to accept two arrays, so its signature needs to be

merge(int[] list1, int[] list2)

answered Oct 30 '14 at 23:47

drew moore

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Anyway, is there an easier way to join two arrays instead of a for loop ? – Avacay Oct 30 '14 at 23:49
@Avacay essentially no: http://stackoverflow.com/questions/80476/how-to-concatenate-two-arrays-in-java – zapl Oct 30 '14 at 23:51
@zapl i see ! Thank you for the reply.. Well as for now, i corrected my code, and it compiles well! However my println seems to be in matrix format :( what does this mean ? – Avacay Oct 30 '14 at 23:53
@Avacay do you see something like http://stackoverflow.com/questions/1040868/java-syntax-and-meaning-behind-b1ef9157-binary-address ? You also `merge` the arrays in a loop. You should only merge once and then print the content with a loop – zapl Oct 31 '14 at 09:37

Joining arrays in method and returning

1 Answers1