使用Number格式的Currency实例进行语法分析时,为什么以下生成解析异常.

float f1 = 123.45678f;

Locale locFR = new Locale("fr");

NumberFormat[] nfa = new NumberFormat[4];

nfa[0] = NumberFormat.getInstance(); //default

nfa[1] = NumberFormat.getInstance(locFR); //FranceLocale

nfa[2] = NumberFormat.getCurrencyInstance(); //Default Currency

nfa[3] = NumberFormat.getCurrencyInstance(locFR); //French Currency

for (NumberFormat nf : nfa){

System.out.println("----------- " + nf.getClass().getName() + "-----------------------");

System.out.println("Default maximum fraction digits : " + nf.getMaximumFractionDigits());

System.out.println(nf.format(f1));

nf.setMaximumFractionDigits(5);

System.out.println("Maximum fraction digits updated to : " + nf.getMaximumFractionDigits());

System.out.println(nf.format(f1));

try{

nf.setMaximumFractionDigits(5);

System.out.println("parsed string: " + nf.parse("1234.56732"));

nf.setParseIntegerOnly(true);

System.out.println("after setParseIntegerOnly" + nf.parse("1234.567"));

}catch (Exception e){e.printStackTrace();};

以上的输出是

----------- java.text.DecimalFormat-----------------------

Default maximum fraction digits : 3

123.457

Maximum fraction digits updated to : 5

123.45678

parsed string: 1234.56732

after setParseIntegerOnly1234

----------- java.text.DecimalFormat-----------------------

Default maximum fraction digits : 3

123,457

Maximum fraction digits updated to : 5

123,45678

parsed string: 1234

after setParseIntegerOnly1234

----------- java.text.DecimalFormat-----------------------

Default maximum fraction digits : 2

ú123.46

Maximum fraction digits updated to : 5

ú123.45678

java.text.ParseException: Unparseable number: "1234.56732"

at java.text.NumberFormat.parse(Unknown Source)

at TwoMinuteDrillTests.doExamples(TwoMinuteDrillTests.java:859)

at TwoMinuteDrillTests.main(TwoMinuteDrillTests.java:871)

----------- java.text.DecimalFormat-----------------------

Default maximum fraction digits : 2

123,46 ñ

Maximum fraction digits updated to : 5

123,45678 ñ

java.text.ParseException: Unparseable number: "1234.56732"

at java.text.NumberFormat.parse(Unknown Source)

at TwoMinuteDrillTests.doExamples(TwoMinuteDrillTests.java:859)

at TwoMinuteDrillTests.main(TwoMinuteDrillTests.java:871)

看起来解析数字很好但是在使用两个货币实例时它很窒息：

nfa[2] = NumberFormat.getCurrencyInstance(); //Default Currency

nfa[3] = NumberFormat.getCurrencyInstance(locFR); //French Currency

还有一种方法可以找出for循环中正在处理的对象的类型是什么？我在上面的例子中使用了nf.getClass().getName(),但它总是返回泛型类型DecimalFormat.我希望能够知道它是在处理货币实例还是数字实例.

提前致谢.