Question

How to get the length of a 2D array in Java

Answer 1

public class MyClass {
    public static void main(String args[]) {
        try {
 
            int[][] arr2d = new int[3][7];
 
            int rows = arr2d.length;
            int columns = arr2d[0].length;
 
            System.out.println("rows = " + rows);
            System.out.println("columns = " + columns);
 
        } catch (Exception e) {
            System.out.print(e.toString());
        }
    }
}




/*
run:

rows = 3
columns = 7

*/

 

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Answer 2

public class MyClass {
    public static void main(String args[]) {
       try {
 
            int[][] arr = new int[][]{new int[]{0, 1, 2, 3, 4},
                                      new int[]{5, 6, 7, 8},
                                      new int[]{9, 10},};
 
            System.out.println("rows = " + arr.length);
            System.out.println("row 0 = " + arr[0].length); 
            System.out.println("row 1 = " + arr[1].length); 
            System.out.println("row 2 = " + arr[2].length); 
 
        } catch (Exception e) {
            System.out.print(e.toString());
        }
    }
}




/*
run:

rows = 3
row 0 = 5
row 1 = 4
row 2 = 2

*/

 

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Answer 3

public class MyClass {
    public static void main(String args[]) {
        int[][] array = {{1, 2, 3, 4}, {7, 8, 0, 2}, {6, 5, 18, 30}};
        
        int rows = array.length; 
        
        int columns = array[0].length; 

        System.out.println("rows = " + rows);
        System.out.println("columns = " + columns);
    }
}




/*
run:

rows = 3
columns = 4

*/

 

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