如何检查二维数组的第二维是否为空？

Question

Lets say for example you have a 2D Array field[60][] . How exactly can you check if the second part of the Array is null? Is there any way to do something similiar like if(field ==null) but for the second dimension?

Answer 1

Just for illustration purpose:

Integer field[][]=new Integer[2][]; 
        field[0]=new Integer[2]; //you can declare size for second dimension like this.
        if(field[0]==null) {   // do null checks
            System.out.println("field[0] is null");
        }if(field[1]==null) {
            System.out.println("field[1] is null");
        }

Output:

field[1] is null