How to parametrize a string and replace parameters

You can do this with MessageFormat:

String userInput = "Showing {0} to {1} of {2}";
String result = MessageFormat.format(userInput, 1, 12, 30);

You can use String.format()

Here is how to do that

int a = 1;
int b = 12;
int c = 30;
String myFormattedString = String.format("Showing %d to %d of %d", a, b, c); 
// Value of myFormattedString is 'Showing 1 to 12 of 30'