checker/tests/formatter/FormatMethodAndFormat.java

import org.checkerframework.checker.formatter.qual.ConversionCategory;
import org.checkerframework.checker.formatter.qual.Format;
import org.checkerframework.checker.formatter.qual.FormatMethod;

public class FormatMethodAndFormat {

  // This method contains both @FormatMethod and @Format.  Both constrain the arguments.
  @FormatMethod
  void log(@Format(ConversionCategory.INT) String format, Object... args) {
    System.out.printf(format, args);
  }

  void client() {
    // Without the @Format annotation (with just the @FormatMethod anno), this would be legal.
    // :: error: (argument)
    log("%s %s", "hello", "goodbye");
  }
}