Java: String to integer array

Question

I have a string, which is a list of coordinates, as follows:

st = "((1,2),(2,3),(3,4),(4,5),(2,3))"

I want this to be converted to an array of coordinates,

a[0] = 1,2
a[1] = 2,3
a[2] = 3,4
....

and so on.

I can do it in Python, but I want to do it in Java. So how can I split the string into array in java??

'split("),(")' may work, but the first and last element have extra parenthesis with them. — Moid
– Moid, Commented Mar 14, 2017 at 13:07
@MoidShaikh Than replace the first and last paranthesis if it´s not needed here — SomeJavaGuy
– SomeJavaGuy, Commented Mar 14, 2017 at 13:08
How to split a string in Java this is different. In my string, there is extra parenthesis. It's a list of coordinates. — Moid
– Moid, Commented Mar 14, 2017 at 13:09

Adam · Accepted Answer · 2017-03-14 13:08:52Z

6

It can be done fairly easily with regex, capturing (\d+,\d+) and the looping over the matches

String st = "((1,2),(2,3),(3,4),(4,5),(2,3))";

Pattern p = Pattern.compile("\\((\\d+),(\\d+)\\)");
Matcher m = p.matcher(st);
List<String> matches = new ArrayList<>();
while (m.find()) {
    matches.add(m.group(1) + "," + m.group(2));
}
System.out.println(matches);

If you genuinely need an array, this can be converted

String [] array = matches.toArray(new String[matches.size()]);

answered Mar 14, 2017 at 13:08

Adam

36.9k9 gold badges104 silver badges145 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

drink-a-Beer · Accepted Answer · 2017-03-14 16:40:58Z

0

Alternative solution:

    String str="((1,2),(2,3),(3,4),(4,5),(2,3))";
    ArrayList<String> arry=new ArrayList<String>();
    for (int x=0; x<=str.length()-1;x++)
    {
        if (str.charAt(x)!='(' && str.charAt(x)!=')' && str.charAt(x)!=',')
        {
            arry.add(str.substring(x, x+3));
            x=x+2;
        }
    }

    for (String valInArry: arry)
    {
        System.out.println(valInArry);
    }

If you don't want to use Pattern-Matcher;

answered Mar 14, 2017 at 16:40

drink-a-Beer

3971 gold badge5 silver badges14 bronze badges

Comments

Sean Patrick Floyd · Accepted Answer · 2017-03-14 16:48:15Z

0

This should be it:

String st = "((1,2),(2,3),(3,4),(4,5),(2,3))";
String[] array = st.substring(2, st.length() - 2).split("\\),\\(");

answered Mar 14, 2017 at 16:48

Sean Patrick Floyd

301k72 gold badges481 silver badges598 bronze badges

Collectives™ on Stack Overflow

Java: String to integer array

3 Answers 3

Comments

Comments

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

Comments

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related