src/java.base/share/classes/java/util/FormattableFlags.java

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package java.util;

/**
 * FormattableFlags are passed to the {@link Formattable#formatTo
 * Formattable.formatTo()} method and modify the output format for {@linkplain
 * Formattable Formattables}.  Implementations of {@link Formattable} are
 * responsible for interpreting and validating any flags.
 *
 * @since  1.5
 */
public final class FormattableFlags {

    // Explicit instantiation of this class is prohibited.
    private FormattableFlags() {}

    /**
     * Left-justifies the output.  Spaces (<code>'&#92;u0020'</code>) will be added
     * at the end of the converted value as required to fill the minimum width
     * of the field.  If this flag is not set then the output will be
     * right-justified.
     *
     * <p> This flag corresponds to {@code '-'} (<code>'&#92;u002d'</code>) in
     * the format specifier.
     */
    public static final int LEFT_JUSTIFY = 1<<0; // '-'

    /**
     * Converts the output to upper case according to the rules of the
     * {@linkplain java.util.Locale locale} given during creation of the
     * {@code formatter} argument of the {@link Formattable#formatTo
     * formatTo()} method.  The output should be equivalent the following
     * invocation of {@link String#toUpperCase(java.util.Locale)}
     *
     * <pre>
     *     out.toUpperCase() </pre>
     *
     * <p> This flag corresponds to {@code 'S'} (<code>'&#92;u0053'</code>) in
     * the format specifier.
     */
    public static final int UPPERCASE = 1<<1;    // 'S'

    /**
     * Requires the output to use an alternate form.  The definition of the
     * form is specified by the {@code Formattable}.
     *
     * <p> This flag corresponds to {@code '#'} (<code>'&#92;u0023'</code>) in
     * the format specifier.
     */
    public static final int ALTERNATE = 1<<2;    // '#'
}