Java can finally join strings

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Using Java 8 you can do this in a very clean way: String. StringJoiner takes a delimiter as a constructor argument and appends it automatically. I have an ArrayList that I want to output completely as a String.

There is also a join method is added into String class to convert an array of String or a list of String joined by a delimiter of your choice. I know it's already been mentioned, but you can actually just take this code and it works immediately, without needing Spring for it. Apache is a little better in that they try to estimate the size of the buffer based on the size of the first element, but because it operates on plain Objects, it doesn't risk paying twice to.

Java String concatenation: How to combine (merge) two Strings

Java examples to join string array to produce single String. This code can be used to convert array to string in Java. Join String Array — Java 8 String. Join multiple string arguments This method takes all strings in var-args format and all strings are passed as argument in the method. The return string is received by appending all strings delimited by argument separator. String join CharSequence delimiter, CharSequence. Java 8 StringJoiner for formatted output Using StringJoiner class, we can produce formatted output of joined string. This is specially useful while using lambda collectors. StringJoiner CharSequence delimiter StringJoiner CharSequence delimiter, CharSequence prefix, CharSequence suffix 2. StringJoiner Example Run the example with similar input as above example to join multiple strings. String list of string with Collectors. Join String Array using StringUtils. First we are joining string array with empty string. In second example, we are joining array with comma.

Thus we print the list without trailing or in this case leading separators. There is also a join method is added into String class to convert an array of String or a list of String joined by a delimiter of your choice. Edit: As pointed out in the comments, the above compiler optimization is indeed creating a new instance of StringBuilder on each iteration. However, this method gets the same job done using a single precisely sized array, and doesn't even pay for if checks within the for loop as apache's does. Some programmer might confuse between StringJoiner and StringBuilder or StringBuffer, but there is a big difference between them. A simple method for joining a collection of strings was not included. All of these other answers include runtime overhead.