Can I escape braces in a java MessageFormat?

Question

I want to output some braces in a java MessageFormat. For example I know the following does not work:

MessageFormat.format("  public {0} get{1}() {return {2};}\n\n", type, upperCamel, lowerCamel);

Is there a way of escaping the braces surrounding "return {2}"?

Solution 1

You can put them inside single quotes e.g.

'{'return {2};'}'

See here for more details.

Solution 2

Wow. Surprise! The documentation for MessageFormat knows the answer:

Within a String, "''" represents a single quote. A QuotedString can contain arbitrary characters except single quotes; the surrounding single quotes are removed. An UnquotedString can contain arbitrary characters except single quotes and left curly brackets. Thus, a string that should result in the formatted message "'{0}'" can be written as "'''{'0}''" or "'''{0}'''".

Solution 3

Use single quotes:

MessageFormat.format("  public {0} get{1}() '{'return {2};'}'\n\n",
                     type, upperCamel, lowerCamel);

If you want to actually use a single quote, just double it. The JavaDoc for MessageFormat gives this somewhat complicated example:

Thus, a string that should result in the formatted message "'{0}'" can be written as "'''{'0}''" or "'''{0}'''".

This is '' for a single quote, then '{' for an escaped brace, then 0, '}' for the closing brace and '' for the closing quote.

Solution 4

System.out.println(MessageFormat.format("I want to see ticks and curly braces around '''{'{0}'}'''", "this"));

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Comments

[Steve Bosman]

I don't see how this is relevant to a Java question

[rjmunro]

It would be helpful to see what exactly the result of this would be.