Question

How to find 2D array (matrix) dimensions (rows, cols) in Java

Answer 1

public class MyClass {
    public static void main(String args[]) {
        int[][] arr = {{31, 22, 33}, 
                       {42, 85, 987}};

        System.out.println("rows: " + arr.length);
        System.out.println("cols: " + arr[0].length);
    }
}

/*
               
run:
  
rows: 2
cols: 3
      
*/

 

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Answer 2

public class MyClass {
    public static void main(String args[]) {
        int[][] arr = {{31, 22, 33, 4}, 
                       {42, 85, 987, 9},
                       {12, 99, 5, 1}};
 
        System.out.println("rows: " + arr.length);
        System.out.println("cols: " + arr[0].length);
    }
}



 
/*
                
run:
   
rows: 3
cols: 4
       
*/

 

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