How do I access an array within an array?

Question

Say I have a .txt file that has information being split by a comma as such:

IN,Indiana,6634007

While this is a snippet which accesses that file and splits it:

for(int i=0; i < count; i++) {
    line = bufferedReader2.readLine();
    String space[] = line.split(",");
    String abb = space[0];
    String nme = space[1];
    int pop = Integer.parseInt(space[2]);
    states[i] = new State(abb, nme, pop);
    }

The purpose of that was so that all the information in the txt file could be accessed, so for example this code would print exactly whats present on the .txt file:

System.out.println(states[0]);

would print:

IN,Indiana,6634007

My question is, how would I have it so that I can access the specific part of the array as in how would I print lets say just the name "Indiana" or the population "6634007"?

P.S I'm sorry if the title of my question did not make sense, I did not exactly know how to word it.

If you have a comma separated file, then you have something close to a CSV file, please check apache commons csv and use it, I believe will help you a lot. — Ademir Constantino
– Ademir Constantino, Commented Aug 31, 2018 at 4:17

SapuSeven · Accepted Answer · 2018-08-31 04:45:48Z

3

Somewhere, you have a class called State. states is an Array of this class. So you can add a getter to State:

public int getPop() {
    return pop;
}

And call it on your Object like this:

System.out.println(states[0].getPop());

as states[0] is simply a State object.

Add more getters to access different fields.

edited Aug 31, 2018 at 4:45

answered Aug 31, 2018 at 4:28

SapuSeven

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Comments

nnzhang · Accepted Answer · 2018-08-31 04:43:08Z

0

if you just want to print every single line, you can try this like below:

public static void main(String[] args) throws Exception {

    BufferedReader reader = new BufferedReader(new FileReader("data.txt"));
    String line = null;
    List<String> list = new ArrayList<String>();
    while((line = reader.readLine()) != null ) {
        list.add(line);

    }

    System.out.println(list.get(0));

    // TODO realease resources
}

answered Aug 31, 2018 at 4:43

nnzhang

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1 Comment

SapuSeven Over a year ago

No, OP is already able to print whole lines. But he wants to print only the third value (if you split the line at ,)

Shibu Murugan · Accepted Answer · 2018-08-31 05:01:57Z

0

From your question what i can realise is, you are using State class to store the information. In such case, check the state class where the first parameter value is stored. Later to print the corresponding information, access its object variable as SapuSeven mentioned.

For eg.

public class State{
     public String a;
     public String b;
     public int c;
     public State(String x, String y, int z){
       a=x;
       b=y;
       c=z;
     } 
 }

now u can access like

System.out.println(states[0].b);

for printing the name of city

OR

you can simply print the value using index like this

System.out.println(states[0].split(",")[2]);

edited Aug 31, 2018 at 5:01

answered Aug 31, 2018 at 4:42

Shibu Murugan

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