Another option is to use relative indexing: The format specifier references the same argument as the last format specifier.

For example:

String.format("%s %<s %<s %<s", "hello")

results in hello hello hello hello.

Just as a complement to Keppils answer: When you've started numbering one of your arguments, you have to number them all, or else the result will not be as expected.

String.format("Hello %1$s! What a %2s!", "world", "wonderful");
// "Hello world! What a wonderful world!"

would work. While

String.format("Hello %1$s! What a %s %1$s!", "world", "wonderful");
// "Hello world! What a world world!"

would not work. (But does not throw any errors, so this might go unnoticed.)

You can use the following:

String str = "Entered number = %d and string = %s";

List<Object> args = new ArrayList<Object>();
args.add(1);
args.add("abcd");

System.out.println(String.format(str, args.toArray()));

will give the output:

Entered number = 1 and string = abcd

From JLS 8.4.1 Format parameters:

The last formal parameter in a list is special; 
it may be a variable arity parameter, indicated by an 
elipsis following the type.

If the last formal parameter is a variable arity parameter of type T, 
it is considered to define a formal parameter of type T[]. 
The method is then a variable arity method. Otherwise, it is a fixed arity 
method. Invocations of a variable arity method may contain more actual 
argument expressions than formal parameters. All the actual argument 
expressions that do not correspond to the formal parameters preceding 
the variable arity parameter will be evaluated and the results stored 
into an array that will be passed to the method invocation.

See this question on StackOverflow!

To get formatting on each of them you need to pass them separately to printf rather than combining them into one string with +.

System.out.printf("%-30s %-30s %-30s", divName, heading1, heading2);