Question

Consider the following two-dimensional array:

String [ ][ ] states = { { "CA", "CO" },

     { "MD", "IL", "ME", "MI" }, { "NY", "NJ", "NE" } };

What is the value of states[2][1] ?

Retrieve ME from the array states and assign it to a String variable of your choice

Using a loop, output all the states that start with the letter M in the second row (as in this example); assume that you do not know how many columns are in the second row, i.e. DO NOT hard code 4; assume that you do not know that the 3 states are MD, ME, MI

Answer 1

String [ ][ ] states = { { "CA", "CO" }, { "MD", "IL", "ME", "MI" }, { "NY", "NJ", "NE" } };

So the first row i.e, states[0] has "CA", "CO"

The second row i.e, states[1] has "MD", "IL", "ME", "MI"

The third row i.e, states[2] has "NY", "NJ", "NE"

So states[2][1] is nothing but second element in third row i.e, "NJ"

Code:

public class Main
{
    public static void main(String args[]) throws Exception
    {
        String [ ][ ] states = { { "CA", "CO" },{ "MD", "IL", "ME", "MI" }, { "NY", "NJ", "NE" } };
        String s=new String();
        s=states[1][2];//retrieving ME and assigning to s
        System.out.println("The string retrieved and stored in s is "+s);
        System.out.print("The states that start with letter M in second row are: ");
        for(int i=0;i<states[1].length;i++)//note that we have not used 4 here
            if(states[1][i].charAt(0)=='M')//checking if first letter in string is M
                System.out.print(states[1][i]+" ");//printing the state is condition is satisfied
    }
}

Screenshot of code and output: