CODEWITHSUNDEEP
java
rtg27
rtg27

Reputation: 13

Splitting a string at a comma in java

I have a string with an unknown length that looks like this

a ,b, c: integer; d,e :real;

How could I split this at the commas without getting the words and characters that follow the last commas of the variables? Or is there a way to split the variables at the commas after it is in an array from splitting at the colon? The closest I have come is with this method

// the variablesArray would contain a ,b,  c in the first index
// and d,e in the second index.
public static String[] variables(String[]variablesArray) { 
    String variables[] = new String[variablesArray.length];

    for(int i = 0; i < variablesArray.length; i++){
        String temporary = variablesArray[i];
        String arr[] = temporary.split(",");
    }
    return variables;
}

When I run this it only returns the first character in the array index

//prints [a d]

Upvotes: 1

Views: 124

Answers (5)

gkrls
gkrls

Reputation: 2664

is this what you want? 

String[] result = s.replaceAll("\\w{2,}", "").replaceAll("[:;,]"," ").replaceAll("\\u0020+"," ").split(" ");

Array result now holds only the single chars. Testing with:

for(String c: array)
        System.out.println(c);

will output:

a
b
c
d
e

Upvotes: 0

SaltyHat
SaltyHat

Reputation: 17

I think you have a problem. temporary.split(","); is an array then you have appened it to be as a part of another array. Thats troublesome .... I mean: 

Array
     0 => Array
               0 => a  
               1 => b

So you should use:

String arr = temporary.split(",");

Upvotes: 0

westonkd
westonkd

Reputation: 96

if myString is equal to "a ,b, c: integer; d,e :real;" the following with output a b c d e

for (String type : myString.split(";")) {
  String sub = type.substring(0, type.indexOf(":"));
  for (String name : sub.split(",")) {
    System.out.println(name);
  }
}

Upvotes: 1

5gon12eder
5gon12eder

Reputation: 25409

You'll need to break the problem up:

  • Split the string at ;.
  • For each of the words you got:
    • Split the string at :
    • Insert the first part (list of variable names) into your array.
    • Throw away the second part (type information).

Note that this will give you the array {"a ,b, c", "d,e"} as I understand from your question that you want it. If you want to split that further, you'll need to split each of these strings again, this time at ,. Note that you'll need to change the type of your array from String[] to String[][] in this case. You'll get {{"a", "b", "c"}, {"d", "e"}}.

If you also want to strip whitespace during the process of splitting, add \s* before and after the split character. For example: "a, b,c , d".split("\\s*,\\s*") returns {"a", "b", "c", "d"}.

Upvotes: 1

dev2d
dev2d

Reputation: 4262

how about following?

public static void main(String[] args) {
    List<String> list = new ArrayList<String>();
    String str = "a ,b,c: integer;d,e :real;";
    String[] stra = str.split(";");
    for(String st: stra){
        //System.out.println(st);
        String[] stra2 = st.split(",");
        for(String s: stra2){
            System.out.println(s);
            list.add(String.valueOf(s.charAt(0)));
        }
    }
    System.out.println(list);
}

OP

a 
b
c: integer
d
e :real
[a, b, c, d, e]

Upvotes: 0

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