Which two statements set the default locale used for formatting numbers, currency, and percentages? (Choose two.)

Question

Options

• ALocale.setDefault(Locale.Category.FORMAT, "zh-CN");
• BLocale.setDefault(new Locale.Builder().setLanguage("en").build());
• CLocale.setDefault(new Locale.Builder().setLanguage("en").setRegion("CA").build());
• DLocale.setDefault("en_US");

• A
  12% (3)
• B
  84% (21)
• D
  4% (1)

Explanation

Options B and C are correct because Locale.setDefault() requires a Locale object as its argument, and both use Locale.Builder - the modern, standards-compliant way to construct one - producing valid Locale instances that Java's formatting APIs (numbers, currency, percentages) will use globally.

Why the distractors fail:

• A is wrong on two levels: the two-argument overload Locale.setDefault(Category, Locale) takes a Locale as the second argument, not a String like "zh-CN". Passing a raw string causes a compile error.
• D is wrong for the same core reason: there is no overload of Locale.setDefault() that accepts a String. Java's API requires an actual Locale object, not a locale tag string.

Memory tip: Think of Locale.setDefault() as a typed setter - it only accepts a Locale, never a String. If you see a string passed directly (like "zh-CN" or "en_US"), it's always wrong. The safe builder pattern is new Locale.Builder().setLanguage(...).setRegion(...).build().

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