Java - How to scan a String into an Array?

Question

I'm having trouble with putting scanned information into array in Java.

private void initializeFriends()
{
    //initialize the size of array:
    friends = new Friend[200];
    //initialize the first 5 objects(Friends):
    friends[0] = new Friend("Rodney Jessep", "rj2013", "Brisbane", "hi!");
    friends[1] = new Friend("Jaime Smiths", "abcd5432", "Sydney", "how's going");
    friends[2] = new Friend("William Arnold", "william1994", "Brisbane", "boom");
    friends[3] = new Friend("James Keating", "qwerty52", "Newcastle", "Hey");
    friends[4] = new Friend("Amy Richington", "IAmRichAmy", "Perth", "Yo");
}

After the procedure above is run, a method called addFriends() is run where a scanner comes in to put data into friend structure.

What is the best way to scan in information into an array? Would using the Scanner in = new Scanner(System.in); feature be wise since there are so many different elements in 'Friend': (String name, String username, String city, String message)?

Did you try reading the docs on Scanner? There are at least a couple of methods that'll help. — Dennis Meng
– Dennis Meng, Commented Aug 25, 2013 at 0:36
scanner.nextLine() will read string,so try to do a loop that read informations, and use this informations to create your Friend Object,try something and we can help you — Charaf JRA
– Charaf JRA, Commented Aug 25, 2013 at 0:39

Eric Leschinski · Accepted Answer · 2013-08-28 06:42:23Z

5

If you're receiving input from the console and can safely assume that it is not going to be formatted improperly you can use:

Scanner in = new Scanner(System.in):  //receives input from the console
String line = in.nextLine(); //receives everything they type until they hit enter

That would take in all the information they enter. If their input is:

"Jaime Smiths, abcd5432, Sydney, how's going"

You can then split the values by comma:

String[] values = line.split(",");
for(String s: values)
    System.out.println(s);

Gives the following output:

"Jaime Smiths"
" abcd5432"
" Sydney"
" how's going"

You'll want to remove trailing and or leading space characters, but that will give you the values you want, and you can then concatenate them and add them to the existing array:

friends[5] = new Friend(values[0], values[1], values[2], values[3]);

edited Aug 28, 2013 at 6:42

Eric Leschinski

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answered Aug 25, 2013 at 1:07

leigero

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Comments

Brandon Minnick · Accepted Answer · 2018-04-25 19:34:40Z

0

If you want to print Arraylist in string by scanner

Scanner scan=new Scanner(System.in);
ArrayList<String> list=new Arraylist<String>();
list.add(Scan.nextline);
System.out.println(list);

edited Apr 25, 2018 at 19:34

Brandon Minnick

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answered Apr 25, 2018 at 19:17

ravi singh

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