Java equivalents of C# String.Format() and String.Join()

I know this is a bit of a newbie question, but are there equivalents to C#'s string operations in Java?

Specifically, I'm talking about String.Format and String.Join.

The Java String object has a format method (as of 1.5), but no join method.

To get a bunch of useful String utility methods not already included you could use org.apache.commons.lang.StringUtils.

String.format. As for join, you need to write your own:

 static String join(Collection<?> s, String delimiter) {
     StringBuilder builder = new StringBuilder();
     Iterator<?> iter = s.iterator();
     while (iter.hasNext()) {
         builder.append(iter.next());
         if (!iter.hasNext()) {
           break;                  
         }
         builder.append(delimiter);
     }
     return builder.toString();
 }

The above comes from http://snippets.dzone.com/posts/show/91

Guava comes with the Joiner class.

import com.google.common.base.Joiner;

Joiner.on(separator).join(data);

As of Java 8, join() is now available as two class methods on the String class. In both cases the first argument is the delimiter.

You can pass individual CharSequences as additional arguments:

String joined = String.join(", ", "Antimony", "Arsenic", "Aluminum", "Selenium");
// "Antimony, Arsenic, Alumninum, Selenium"

Or you can pass an Iterable<? extends CharSequence>:

List<String> strings = new LinkedList<String>();
strings.add("EX");
strings.add("TER");
strings.add("MIN");
strings.add("ATE");

String joined = String.join("-", strings);
// "EX-TER-MIN-ATE"

Java 8 also adds a new class, StringJoiner, which you can use like this:

StringJoiner joiner = new StringJoiner("&");
joiner.add("x=9");
joiner.add("y=5667.7");
joiner.add("z=-33.0");

String joined = joiner.toString();
// "x=9&y=5667.7&z=-33.0"

TextUtils.join is available on Android