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MessageFormat mf = new MessageFormat("数字{0}");
System.out.println(mf.format(new Object[] { 12345 }));
// 输出结果为:数字12,345
private StringBuffer subformat(Object[] arguments, StringBuffer result,
FieldPosition fp, List characterIterators) {
// note: this implementation assumes a fast substring & index.
// if this is not true, would be better to append chars one by one.
int lastOffset = 0;
int last = result.length();
for (int i = 0; i <= maxOffset; ++i) {
result.append(pattern.substring(lastOffset, offsets[i]));
lastOffset = offsets[i];
int argumentNumber = argumentNumbers[i];
if (arguments == null || argumentNumber >= arguments.length) {
result.append("{" + argumentNumber + "}");
continue;
}
// int argRecursion = ((recursionProtection >> (argumentNumber*2)) & 0x3);
if (false) { // if (argRecursion == 3){
// prevent loop!!!
result.append('\uFFFD');
} else {
Object obj = arguments[argumentNumber];
String arg = null;
Format subFormatter = null;
if (obj == null) {
arg = "null";
} else if (formats[i] != null) {
subFormatter = formats[i];
if (subFormatter instanceof ChoiceFormat) {
arg = formats[i].format(obj);
if (arg.indexOf('{') >= 0) {
subFormatter = new MessageFormat(arg, locale);
obj = arguments;
arg = null;
}
}
} else if (obj instanceof Number) {
// format number if can
subFormatter = NumberFormat.getInstance(locale);
} else if (obj instanceof Date) {
// format a Date if can
subFormatter = DateFormat.getDateTimeInstance(
DateFormat.SHORT, DateFormat.SHORT, locale);//fix
} else if (obj instanceof String) {
arg = (String) obj;
} else {
arg = obj.toString();
if (arg == null) arg = "null";
}
// At this point we are in two states, either subFormatter
// is non-null indicating we should format obj using it,
// or arg is non-null and we should use it as the value.
if (characterIterators != null) {
// If characterIterators is non-null, it indicates we need
// to get the CharacterIterator from the child formatter.
if (last != result.length()) {
characterIterators.add(
createAttributedCharacterIterator(result.substring
(last)));
last = result.length();
}
if (subFormatter != null) {
AttributedCharacterIterator subIterator =
subFormatter.formatToCharacterIterator(obj);
append(result, subIterator);
if (last != result.length()) {
characterIterators.add(
createAttributedCharacterIterator(
subIterator, Field.ARGUMENT,
new Integer(argumentNumber)));
last = result.length();
}
arg = null;
}
if (arg != null && arg.length() > 0) {
result.append(arg);
characterIterators.add(
createAttributedCharacterIterator(
arg, Field.ARGUMENT,
new Integer(argumentNumber)));
last = result.length();
}
}
else {
if (subFormatter != null) {
arg = subFormatter.format(obj);
}
last = result.length();
result.append(arg);
if (i == 0 && fp != null && Field.ARGUMENT.equals(
fp.getFieldAttribute())) {
fp.setBeginIndex(last);
fp.setEndIndex(result.length());
}
last = result.length();
}
}
}
result.append(pattern.substring(lastOffset, pattern.length()));
if (characterIterators != null && last != result.length()) {
characterIterators.add(createAttributedCharacterIterator(
result.substring(last)));
}
return result;
}
NumberFormat nf = NumberFormat.getInstance();
float dblNum = 10f;
nf.setMaximumFractionDigits(2);
MessageFormat mf = new MessageFormat("数字{0,number,#.##}");
System.out.println(mf.format(new Object[] { 12345.222 }));//去掉逗号,保留两位小数