Question

How to print 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});
        
        for (int i = 0; i < li.size(); i++) {
            int[] arr = new int[4]; 
            arr = li.get(i);
            for (int j = 0;j < arr.length; j++) {
                System.out.printf("%2d", arr[j]); 
            }
            System.out.println();
        }   
    }
}
 
 
 
/*
run:
 
 6 8 1 2
 9 3 4
 5 7
 
*/

 

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