Question

I tried to make manual currency. Here is my code

DecimalFormat df = new DecimalFormat();
DecimalFormatSymbols dfs = new DecimalFormatSymbols();
dfs.setCurrencySymbol("$");
dfs.setGroupingSeparator( . );
dfs.setDecimalSeparator( . );
df.setDecimalFormatSymbols(dfs);
System.out.println(df.format(3333454));

方案产出

3.333.454

我确定的货币编号为何没有出现?

Answer 1

引证:

NumberFormat df = NumberFormat.getCurrencyInstance();
DecimalFormatSymbols dfs = new DecimalFormatSymbols();
dfs.setCurrencySymbol("$");
dfs.setGroupingSeparator( . );
dfs.setMonetaryDecimalSeparator( . );
((DecimalFormat) df).setDecimalFormatSymbols(dfs);
System.out.println(df.format(3333454));

Answer 2

由于您使用DecimalFormat,并采用标准格式。页: 1 货币编号。

或您使用NumberFormat.getCurrencyInstance(。

Answer 3

You ve told the DecimalFormat which currency symbol to use when it must format a currency. But you haven t told it to format a currency. The default pattern used by the no-arg constructor isn t meant to format currencies. Use a dedicated pattern for that.

javadoc告诉你你需要知道的一切。

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