Two dimensional array list

Question

I\'ve heard of using a two dimensional array like this :

String[][] strArr;

But is there any way of doing this with a list?

Maybe s

Answer 1

Declaring a two dimensional ArrayList:

ArrayList> rows = new ArrayList();

Or

ArrayList> rows = new ArrayList<>();

Or

ArrayList> rows = new ArrayList>(); 

All the above are valid declarations for a two dimensional ArrayList!

Now, Declaring a one dimensional ArrayList:

ArrayList row = new ArrayList<>();

Inserting values in the two dimensional ArrayList:

for(int i=0; i<5; i++){
    ArrayList row = new ArrayList<>();
    for(int j=0; j<5; j++){
        row.add("Add values here"); 
    }
    rows.add(row); 
}

fetching the values from the two dimensional ArrayList:

for(int i=0; i<5; i++){
    for(int j=0; j<5; j++){
        System.out.print(rows.get(i).get(j)+" ");
     }
     System.out.println("");
}