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how can i extract all the elements in a string [] or arraylist and combine all the words with proper formating(with a single space) between them and store in a array..

String[] a = {"Java", "is", "cool"};

Output: Java is cool.

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2 Answers

up vote 1 down vote accepted

Use a StringBuilder.

String[] strings = {"Java", "is", "cool"};
StringBuilder builder = new StringBuilder();

for (String string : strings) {
    if (builder.length() > 0) {
        builder.append(" ");
    }
    builder.append(string);
}

String string = builder.toString();
System.out.println(string); // Java is cool

Or use Apache Commons Lang StringUtils#join().

String[] strings = {"Java", "is", "cool"};
String string = StringUtils.join(strings, ' ');
System.out.println(string); // Java is cool
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is there a easy way out because i m not that advance in java.. – user647207 May 8 '11 at 3:35
If there was an easy API-provided way, I'd have answered it. If you need to do it repeatedly, just hide it away in an utility method or just drop commons-lang.jar in classpath. – BalusC May 8 '11 at 3:36
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up vote 1 down vote

My recommendation would be to use org.apache.commons.lang.StringUtils:

org.apache.commons.lang.StringUtils.join(a, " ");
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