Question

How to get rows and columns of dynamic 2D ArrayList in java

Answer 1

import java.util.ArrayList;
import java.util.List;

public class MyClass {
    public static void main(String args[]) {
        List<int[]> li = new ArrayList<>();
        
        li.add(new int[]{6, 8, 1, 2});
        li.add(new int[]{9, 3, 4});
        li.add(new int[]{5, 7});
        
        System.out.printf("total rows: %d\n", li.size()); 
        
        for (int i = 0; i < li.size(); i++) {
            System.out.printf("row: %d - cols: %d\n", i, li.get(i).length); 
        }   
    }
}
 
 
 
/*
run:
 
total rows: 3
row: 0 - cols: 4
row: 1 - cols: 3
row: 2 - cols: 2
 
*/

 

70+ SQL courses for beginners and professionals