difference between System.out.printf and String.format

Question

may i know what is the difference between the two in java? i am reading a book and it can either use both of it to display strings.

Answer 1

String.format returns a new String, while System.out.printf just displays the newly formatted String to System.out, sometimes known as the console.

These two snippets of code are functionally equivalent:

String formattedString = String.format("%d is my favorite number", 42);
System.out.print(formattedString);

and

System.out.printf("%d is my favorite number", 42);