How to get int array from string array

Question

File myFile = new File(
    Environment.getExternalStorageDirectory().getAbsolutePath(),
    "Notes/test.txt"
);
BufferedReader br = new BufferedReader(new FileReader(myFile));
String line = br.readLine();
while ((line = br.readLine()) != null) {
    b = line.split(",");
    xpoints = new int[b[0].length()];
    ypoints = new int[b[1].length()];
    for (int i = 1; i < b[0].length(); i++) {
        xpoints[i] = Integer.parseInt(b[0]);
        ypoints[i] = Integer.parseInt(b[1]);                
    }
    /*direction(xpoints, ypoints);*/
}
br.close();

Here, I get X and Y value from b[0] and b[1]. I want to store this values in integer array(like int []x and int []y).How can i get all these values in array as i said earlier?

Do you want two arrays? One for the x-values and one for the y-values? Or do you want one array where each value is a combination of the x-y value — Henk Jansen
– Henk Jansen, Commented Jan 30, 2015 at 9:24

Eypros · Accepted Answer · 2015-01-30 09:26:08Z

4

You should parse your String into int like:

x[i] = Integer.parseInt(str);

for every single String representation of each int element

beware to provide into str though only integer because it will throw NumberFormatException otherwise.

answered Jan 30, 2015 at 9:26

Eypros

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Comments

Dragondraikk · Accepted Answer · 2015-01-30 09:27:04Z

0

You can iterate over the String array in a loop and then store the values in an int array of the same size.

int[] intArray = new int[b.length];
for(int i = 0; i < b.length; i++){
    try{
        intArray[i] = Integer.parseInt(b[i]);
    catch(NumberFormatException e){
        //handle exception
    }
}

answered Jan 30, 2015 at 9:27

Dragondraikk

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Comments

Sam Bains · Accepted Answer · 2015-01-30 09:30:58Z

0

In your while statement when you do a split do this:

String[] b = line.split(splitsby);
int[] intArray = new int[b.length];
for (int stringIndex = 0; stringIndex < b.length; stringIndex++) {
    intArray[stringIndex] = Integer.parseInt(b[stringIndex]);
}
System.out.println("X = " + intArray[0] + " Y = " + intArray[1]);

This is assuming that every value in b can be parsed as an Integer

answered Jan 30, 2015 at 9:30

Sam Bains

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Comments

Vilas · Accepted Answer · 2015-01-30 09:31:03Z

0

Since you dont know the exact size of the elements you will get from file, I suggest you to create a ArrayList.

Arralist<Integer> a=new ArrayList<Integer>();
Arralist<Integer> b=new ArrayList<Integer>();

Then

File myFile = new File(Environment
                        .getExternalStorageDirectory().getAbsolutePath(),
                        "Notes/test.txt");
BufferedReader br = new BufferedReader(new FileReader(myFile));
String line=br.readLine();
String splitsby = ",";
while ((line = br.readLine()) !=null) {
     String[] b=line.split(splitsby);
     System.out.println("X = "+b[0]+" Y = "+b[1]);
     a.add(Integer.parseInt(b[0]);
     b.add(Integer.parseInt(b[1]);
}
br.close();

answered Jan 30, 2015 at 9:31

Vilas

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Comments

Giulio Biagini · Accepted Answer · 2015-01-30 10:29:25Z

0

You can add this method:

private ArrayList<Integer> getIntegerArray(ArrayList<String> stringArray) {
    ArrayList<Integer> result = new ArrayList<Integer>();
    for(String stringValue : stringArray) {
        try {
            // convert String to Integer and store it into integer array list
            result.add(Integer.parseInt(stringValue));
        } catch (NumberFormatException nfe) {
            // System.out.println("Could not parse " + nfe);
            Log.w("NumberFormat", "Parsing failed! " + stringValue + " can not be an integer");
        } 
    }       
    return result;
}

edited Jan 30, 2015 at 10:29

Giulio Biagini

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answered Jan 30, 2015 at 9:32

Neha Agarwal

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1 Comment

Giulio Biagini Over a year ago

Hint: Code blocks on their own are not very informative. Please explain what the code you're showing does, why you chose to write it that way, and how you expect it to work.

someone · Accepted Answer · 2015-01-30 10:30:18Z

0

You can use Integer.parseInt() method to convert string into integer. you have to go through each string array element to use above method. Following like code can be used in any place as per your requirement.

    int[] x = new int[2];
    x[0] = Integer.parseInt(b[0]);
    x[1] = Integer.parseInt(b[1]);

edited Jan 30, 2015 at 10:30

answered Jan 30, 2015 at 9:27

someone

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1 Comment

Giulio Biagini Over a year ago

Hint: Code blocks on their own are not very informative. Please explain what the code you're showing does, why you chose to write it that way, and how you expect it to work.

user2795559 · Accepted Answer · 2015-01-30 09:28:48Z

-1

Integer.parseInt(b[0]); See the Javadoc for more information.

answered Jan 30, 2015 at 9:28

user2795559

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