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Are System.out.printf and System.out.format totally the same or perhaps they differ in somehow?
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The key difference between them is that printf() prints the formatted String into console much like System. out. println() but the format() method returns a formatted string, which you can store or use the way you want.
System.out.printf("The String object %s is at hash code %h%n", s, s); String class format( ) method: You can build a formatted String and assign it to a variable using the static format method in the String class. The use of a format string and argument list is identical to its use in the printf method.
System. out. format("The value of " + "the float variable is " + "%f, while the value of the " + "integer variable is %d, " + "and the string is %s", floatVar, intVar, stringVar); The first parameter, format , is a format string specifying how the objects in the second parameter, args , are to be formatted.
Using printf() , String. format() or Formatter is essentially the same thing. The only thing that differs is the return type - printf() prints to the standard output stream (typically your console) and String.
System.out is a PrintStream, and quoting the javadoc for PrintStream.printf
An invocation of this method of the form
out.printf(l, format, args)behaves in exactly the same way as the invocationout.format(l, format, args)
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The actual implementation of both printf overloaded forms
public PrintStream printf(Locale l, String format, Object ... args) { return format(l, format, args); } and
public PrintStream printf(String format, Object ... args) { return format(format, args); } uses the format method's overloaded forms
public PrintStream format(Locale l, String format, Object ... args) and
public PrintStream format(String format, Object ... args) respectively.
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