NumberFormat class

getCurrencyInstanceはlocaleにより表示内容が違う
getInstance,getIntegerInstanceはlocaleに影響を受けない

public class Outer {
    public static void main(String args[]) {        
        Locale.setDefault(Locale.JAPAN);
        method();
        Locale.setDefault(Locale.US);
        method();
    }
    static void method() {
        System.out.println("-------------------");
        double num = 10000.99;
        NumberFormat nf1 = NumberFormat.getInstance();
        NumberFormat nf2 = NumberFormat.getIntegerInstance();
        NumberFormat nf3 = NumberFormat.getPercentInstance();
        NumberFormat nf4 = NumberFormat.getCurrencyInstance(Locale.US);
        NumberFormat nf5 = NumberFormat.getCurrencyInstance(Locale.JAPAN);
        NumberFormat nf6 = NumberFormat.getCurrencyInstance();
        System.out.println(nf1.format(num));
        System.out.println(nf2.format(num));
        System.out.println(nf3.format(num));
        System.out.println(nf4.format(num));
        System.out.println(nf5.format(num));        
        System.out.println(nf6.format(num));        
    }
}

-------------------
10,000.99
10,001
1,000,099%
$10,000.99
￥10,001
￥10,001
-------------------
10,000.99
10,001
1,000,099%
$10,000.99
￥10,001
$10,000.99