Question

Please help with the explanation of the of the following code's output:

public class ArrayTest {

public static void main(String[] args) {

int [][] myArray = {{3,4},{}};

System.out.print(myArray.length + " ");

System.out.print(myArray[0].length + " ");

System.out.print(myArray[1].length + " ");

System.out.print(myArray[0][0] + " ");

Output = 2 2 0 3

Please justfiy this code's output.

Answer 1

public class ArrayTest {

    public static void main(String[] args) {
        int[][] myArray = {{3, 4}, {}};     // matrix with 2 rows, first row contains values 3, 4 and second row is empty
        System.out.print(myArray.length + " ");     // length of the array is number of row in myArray matrix. (2) 
        System.out.print(myArray[0].length + " ");  // number of elements in first row (2)
        System.out.print(myArray[1].length + " ");  // number of elements in second row (0)
        System.out.print(myArray[0][0] + " ");      // first element in first row (which is 3)
        
        // so, it prints 2 2 0 3
    }
}