Way to format strings with "?" parameters to full string in java?

java string logging parameters format-string
qwazer picture qwazer · Sep 2, 2011 · Viewed 27.8k times · Source

For example I want to implement class with method

public class Logger {

    public void info(String message, String[] params) {
    }
}

If input is 

new Logger().info("Info: param1 is ? , param2 is ?", new  String[] {"a", "b"});

Output must be 

Info: param1 is a , param2 is b

What is the easiest way to implement it?

Answer

Buhake Sindi picture Buhake Sindi · Sep 2, 2011

You can use the String.format(String format, Object ... args) method for this. Instead of using a ?, you can do C style %x format, where x can be d (for int), s (for string), etc.

Example.

Also, you can view the Formatter.format class method. It shows you all formatting flags acceptale for formatting (String.format() method uses Formatter to do the formatting).

Related questions

Built-in string formatting vs string concatenation as logging parameter

I'm using SonarLint that shows me an issue in the following line. LOGGER.debug("Comparing objects: " + object1 + " and " + object2); Side-note: The method that contains this line might get called quite often. The description for this issue is "Preconditions" and logging …

Read More
How do I convert a String to an int in Java?

How can I convert a String to an int in Java? My String contains only numbers, and I want to return the number it represents. For example, given the string "1234" the result should be the number 1234.

Read More
How to split a string in Java

I have a string, "004-034556", that I want to split into two strings: string1="004"; string2="034556"; That means the first string will contain the characters before '-', and the second string will contain the characters after '-'. I also want to …

Read More