CODEWITHSUNDEEP
javaarrays
Nithyn. K
Nithyn. K

Reputation: 111

Convert a List of Strings into a single String using ArrayUtils in java

I have below code

List<String> test = new ArrayList<String>();
test.add("one");
test.add("two");
test.add("three");

Need output as "one,two,three" in a single string using Array Utils. Need a single line solution.

Upvotes: 6

Views: 27695

Answers (4)

Algorithmatic
Algorithmatic

Reputation: 1892

You can't do this with ArrayUtils. You can use Apache's StringUtils join function to get the result you want.

// result is "one,two,three"
StringUtils.join(test, ',');

If you don't want to use a library, you can create this function:

public static String joiner(List<String> list, String separator){
    StringBuilder result = new StringBuilder();
    for(String term : list) result.append(term + separator);
    return result.deleteCharAt(result.length()-separator.length()).toString();
}

Upvotes: 3

vishnu pp
vishnu pp

Reputation: 1

       List<String> test = new ArrayList<String>();
        test.add("one");
        test.add("two");
        test.add("three");
       Iterator it = test.iterator();

       while(it.hasNext()){

      String s=it.next();
      StringBuilder sb = new StringBuilder();

     sb.append(s);
}

Upvotes: -1

Elliott Frisch
Elliott Frisch

Reputation: 201409

If you must use ArrayUtils then you could use List.toArray(T[]) (because ArrayUtils is for arrays) and a regular expression to remove { and } on one line like

List<String> test = new ArrayList<>(Arrays.asList("one", "two", "three"));
System.out.println(ArrayUtils.toString(test.toArray(new String[0]))
        .replaceAll("[{|}]", ""));

Output is (as requested)

one,two,three

The String.join(CharSequence, Iterable<? extends CharSequence>) suggested by @Vishnu's answer offers a solution that eschews ArrayUtils (but is arguable better, assuming you can use it) with

String joined2 = String.join(",", test);
System.out.println(joined2);

which outputs the same.

Upvotes: 0

Vishnu
Vishnu

Reputation: 12283

Use join

String joined2 = String.join(",", test );

Upvotes: 22

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