In-line string substitution in Java?

Question

I'm doing some work in Processing, which is basically Java. I normally do only work in Ruby and I've gotten used to a lot of the fairly elegant and beautiful code conventions there.

If I have a string that I'd like to insert other strings into, what's the most beautiful way to do it in Java?

In Ruby, I do something like this generally (where each variable is a string):

p "The #{person_title} took a #{mode_of_transit} to the #{holiday_location} for a nice #{verb} in the #{noun}"

It would appear in Java that I need to manually concatenate them like this:

println("The " + personTitle + " took a " + modeOfTransit + " to the " holidayLocation + for a nice " + verb + " in the " + noun)

This just feels wrong to me. It works, but it just isn't smooth. Is there a way to do this in Java?

Answer 1

最接近的是：

 String s = String.format("The %s took a %s to the %s for a nice %s in the %s", personTitle, modeOfTransit, holidayLocation, verb, noun);

Answer 2

Take a look at the String.format() method for building a formatted string, or PrintStream.format() for formatting and printing directly. ( System.out is a PrintStream .)

Answer 3

You may use System.out.format() method to write formatted string to System.out or format a string using the static method String.format. For more details on formatting read this article.

System.out.format("The %s took a %s to the %s for a nice %s in the %s",
         personTitle, modeOfTransit, holidayLocation, verb, noun);

Answer 4

You can use System.out.printf (same as System.out.format ) and a format string ( "%s" is the format specifier for a string) to both make it look more fluid and also format your output the way you want.

There's also String.format that returns the formatted String , rather than having to print it (like sprintf in C).