In Java a 2D array is an array of arrays in other words

test[3][1] is a float
test[3] is an array of floats
test is an array of arrays of floats

You can use Arrays.sort() to sort an array of floats BUT you can't use it to sort an array of arrays so

Arrays.sort(test[3]) is Ok but Arrays.sort(test) is not here is some code to demonstrate what I mean

1. float[][] test = new float[5][2];
2. 
   
3. void setup() {
4.   test[0][0] = 5;
5.   test[0][1] = 6;
6.   test[1][0] = 3;
7.   test[1][1] = 2;
8.   test[2][0] = 9;
9.   test[2][1] = 5;
10.   test[3][0] = 2;
11.   test[3][1] = 8;
12.   test[4][0] = 7;
13.   test[4][1] = 1;
14.  
15.   printArray(test);
16.   sortArray(test);
17.   printArray(test); 
18. }
19. 
    
20. void sortArray(float[][] a){
21.    for(int i=0; i < a.length; i ++){
22.       Arrays.sort(a[i]);
23.    }
24. }
25. 
    
26. void printArray(float[][] a){
27.   println("############ Array ############");
28.   for(int i=0; i < a.length; i ++){
29.     for(int j = 0; j < a[i].length; j++){
30.      print(" " + a[i][j]);
31.     }
32.     println();
33.   }
34. }

thanks,

i have been thinking, i will use a arrayList that stores a class i will write.
That way i can write a comparator for it. This will also allow me to use a sort1 sort2 option.