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Java String formatting FAQ: How can I format Java output? You can format Java string output with the String.format method, which works like a “Java sprintf” method. Here are some examples: // output a string log.debug( String.format('The rename status is (%d)', RENAMESUCCEEDED) ); // format some text and assign it to a string String status = String.format('The rename status is (%d)', RENAMESUCCEEDED); // how to format a string with multiple variables log.debug( String.format('%s is%d years old, er, young', 'Al', 45) ); For more information on those examples, see the sections below. A Java String format example Here’s a quick example of how to use the format method to format a string before I pass it to a Log4J log.debug method: log.debug( String.format('The rename status is (%d)', RENAMESUCCEEDED) ); If you’re familiar with the sprintf function from other languages like C, Perl, or Ruby, this syntax will look familiar. But, if you’re not familiar with this syntax, what happens in the line of code above is that the%d in my Java String is replaced by the value of the variable RENAMESUCCEEDED, which in this case happens to be a constant in my class.
Feb 07, 2007 And I don't think you would be able to look at a JTextArea and tell whether it was empty or whether it contained a single new-line character. Using the conditional operator you can rewrite the above example in a single line like this: max = (a > b)? A: b; (a > b)? A: b; is an expression which returns one of two values, a or b.
The%d symbol is a placeholder that indicates that a decimal value (something like an int or long in Java) should be printed in place of this symbol. The value of that decimal comes from the variable that follows my string, in this case the RENAMESUCCEEDED variable.