Inserting a Java string in another string without concatenation? [duplicate]

Answer 1

   String test = String.format("test goes here %s more text", "Testing");

is the closest thing that you could write in Java

Answer 2

A more elegant way might be:

 String value = "Testing"; 
 String template = "text goes here %s more text";
 String result = String.format(template, value);

Or alternatively using MessageFormat:

 String template = "text goes here {0} more text";
 String result = MessageFormat.format(template, value);

---

Note, if you're doing this for logging, then you can avoid the cost of performing this when the log line would be below the threshold. For example with SLFJ:

The following two lines will yield the exact same output. However, the second form will outperform the first form by a factor of at least 30, in case of a disabled logging statement.

logger.debug("The new entry is "+entry+".");
logger.debug("The new entry is {}.", entry);

Answer 3

Why do you think string concatenation isn't elegant?

If all you are doing is simple concatenation, I'd argue that code readability is more important and I'd leave it like you have it. It's more readable than using a StringBuilder.

Performance won't be the problem that most people think it is.

Read this from CodingHorror

Answer 4

Rythm a java template engine now released with an new feature called String interpolation mode which allows you do something like:

String result = Rythm.render("Hello @who!", "world");

The above case shows you can pass argument to template by position. Rythm also allows you to pass arguments by name:

Map<String, Object> args = new HashMap<String, Object>();
args.put("title", "Mr.");
args.put("name", "John");
String result = Rythm.render("Hello @title @name", args);

Links:

• Check the full featured demonstration
• read a brief introduction to Rythm
• download the latest package or
• fork it