GetFormatSpecifier.java

/*
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
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 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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/*
 * @test
 * @bug     5063455
 * @summary Unit test for MissingFormatArgumentException.getFormatSpecifier
 * @author  Brandon Passanisi
 */
import java.util.MissingFormatArgumentException;

public class GetFormatSpecifier {

    static void fail(String s) {
        throw new RuntimeException(s);
    }

    public static void main(String[] args) {

        // Use the format specifier below, which should throw a
        // MissingFormatArgumentException. Then, use getFormatSpecifier()
        // to make sure the returned value equals the original format string.
        final String formatSpecifier = "%1$5.3s";
        try {
            String formatResult = String.format(formatSpecifier);
            fail("MissingFormatArgumentException not thrown.");
        } catch (MissingFormatArgumentException ex) {
            final String returnedFormatSpecifier = ex.getFormatSpecifier();
            if (!returnedFormatSpecifier.equals(formatSpecifier)) {
                fail("The specified format specifier: " + formatSpecifier
                        + " does not match the value from getFormatSpecifier(): "
                        + returnedFormatSpecifier);
            }
        }
    }
}