There should be a single one dimensional array. Here is an example of Insertion Sort. It sorts the integer array.

class InsertSort{
     public static void insertionSort(int a[]){
     int in, out;

     for(out=1; out<a.length; out++)   
     {
     int temp = a[out];     
     in = out;          
     while(in>0 && a[in-1] >= temp) 
      {
      a[in] = a[in-1];      
      --in;           
      }
     a[in] = temp;         
     } 
   } 
  public static void main(String[] args)
   {
   int arr[]={99,55,33,44,88,11};
   insertionSort(arr);
   for(int j=0; j<arr.length; j++)   
     System.out.print(arr[j] + " "); 
     System.out.println("");
   }      
  }

You can also sort string array. Here is an example of sorting string array.

public class InsertionSort {
public static void sort(String[] array) {
int N = array.length;
for (int i = 1; i < N; i++)
for (int j = i; j > 0; j--)
if (array[j-1].compareTo(array[j]) > 0)
change(array, j, j-1);
else break;
}
private static void change(Comparable[] a, int i, int j) {
Comparable swap = a[i];
a[i] = a[j];
a[j] = swap;
}
public static void main(String[] args) {
String[] array ={"S","D", "A","B","Z", "M","O", "L","H", "Y"};
sort(array);
for (int i = 0; i < array.length; i++) {
System.out.print(array[i] + " ");
}
System.out.println();
}
}

For more information, visit the following link:

http://www.roseindia.net/java/beginners/arrayexamples/InsertionSort.shtml