test/jdk/java/util/Scanner/spi/UseLocaleWithProvider.java

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/*
 * @test
 * @bug 8190278 8174269
 * @summary checks the Scanner.useLocale() with java.locale.providers=SPI,
 *          CLDR. It should not throw ClassCastException if any SPI is
 *          used and NumberFormat.getInstance() does not return a
 *          DecimalFormat object. Also, to test the behaviour of Scanner
 *          while scanning numbers in the format of Scanner's locale.
 * @modules jdk.localedata
 * @library provider
 * @build provider/module-info provider/test.NumberFormatProviderImpl
 *        provider/test.NumberFormatImpl
 * @run main/othervm -Djava.locale.providers=SPI,CLDR UseLocaleWithProvider
 */

import java.util.Locale;
import java.util.Scanner;

public class UseLocaleWithProvider {

    public static void main(String[] args) {

        try {
            testScannerUseLocale("-123.4", Locale.US, -123.4);
            testScannerUseLocale("-123,45", Locale.of("fi", "FI"), -123.45);
            testScannerUseLocale("334,65", Locale.FRENCH, 334.65);
            testScannerUseLocale("4.334,65", Locale.GERMAN, 4334.65);
        } catch (ClassCastException ex) {
            throw new RuntimeException("[FAILED: With" +
                    " java.locale.providers=SPI,CLDR, Scanner.useLocale()" +
                    " shouldn't throw ClassCastException]");
        }
    }

    private static void testScannerUseLocale(String number, Locale locale,
                                             Number actual) {
        Scanner sc = new Scanner(number).useLocale(locale);
        if (!sc.hasNextFloat() || sc.nextFloat() != actual.floatValue()) {
            throw new RuntimeException("[FAILED: With" +
                    " java.locale.providers=SPI,CLDR, Scanner" +
                    ".hasNextFloat() or Scanner.nextFloat() is unable to" +
                    " scan the given number: " + number + ", in the given" +
                    " locale:" + locale + "]");
        }
    }
}