Java中的 NumberFormat setCurrency() 方法及示例
setCurrency()方法是Java.text.NumberFormat 的内置方法,它在格式化货币值时设置此数字格式使用的货币。这不会更新数字格式使用的最小或最大小数位数。它会覆盖最初的货币。
句法:
public void setCurrency(Currency currency)
参数:该函数接受一个强制参数currency ,它指定要设置的货币。
返回值:该函数不返回任何内容,因此返回类型为 void。
错误和异常:该函数抛出两种类型的异常,可描述如下:
- UnsupportedOperationException : 如果数字格式类没有实现货币格式,则抛出它
- NullPointerException如果货币为空则抛出
下面是上述函数的实现:
程序 1 :
// Java program to implement
// the above function
import java.text.NumberFormat;
import java.util.Locale;
import java.util.Currency;
public class Main {
public static void main(String[] args)
throws Exception
{
NumberFormat nF
= NumberFormat.getNumberInstance();
// Initially currency
System.out.println("Initially Currency: "
+ nF.getCurrency());
// Currency set to US
nF.setCurrency(Currency
.getInstance(Locale.CANADA));
// Print the currency
System.out.println("Currency set as: "
+ nF.getCurrency());
}
}
输出:
Initially Currency: USD
Currency set as: CAD
方案二:
// Java program to implement
// the above function
import java.text.NumberFormat;
import java.util.Locale;
import java.util.Currency;
public class Main {
public static void main(String[] args)
throws Exception
{
try {
NumberFormat nF
= NumberFormat.getNumberInstance();
// Initially currency
System.out.println("Initially Currency: "
+ nF.getCurrency());
// Currency set to US
nF.setCurrency(null);
// Print the currency
System.out.println("Currency set as: "
+ nF.getCurrency());
}
catch (Exception e) {
System.out.println("Exception is: " + e);
}
}
}
输出:
Initially Currency: USD
Exception is: java.lang.NullPointerException
参考:https: Java Java.util.Currency)