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NumberFormat numberFormat = new DecimalFormat("####,###");
System.out.println(numberFormat.format(Integer.parseInt("1234564589")));
需要注意int类型的长度
float f = 12345678.9f;
String str = String.format("%.2f", f).replaceAll("(?=(\\d{3})+\\.)", ",");
String formatFloat(float num) {
StringBuffer buf = new StringBuffer(Float.toString(num));
buf = buf.reverse();
int dotPos = buf.indexOf(".");
final int start = dotPos == -1 ? 0 : dotPos;
StringBuffer sb = new StringBuffer();
for (int i = 0; i < buf.length(); ++i) {
if ((i - start) % 3 == 0 && (i - start) != 0) {
sb.append(',');
}
sb.append(buf.charAt(i));
}
return sb.reverse().toString();
}
String.format("%1$,.2f", 12345678.9)