Java中的 Currency toString() 方法及示例

Java中 Currency 类的toString()方法用于检索该货币的货币代码，实际上是字符串格式的官方 ISO 4217 货币代码

句法：

CURRENCY.toString()

参数：此方法不接受任何参数。

返回值：此方法返回货币的 ISO 4217 货币代码。

异常：如果调用无效代码，该方法将引发运行时错误。

下面的程序说明了 toString() 方法的工作：

方案一：

// Java Code to illustrate toString() method
  
import java.util.*;
  
public class Currency_Demo {
    public static void main(String[] args)
    {
  
        // Creating a currency with the code
        Currency curr_ency
            = Currency.getInstance("INR");
  
        // Getting the currency code
        String currency_code
            = curr_ency.toString();
        System.out.println("Currency Code of India is: "
                           + currency_code);
    }
}

输出：

Currency Code of India is: INR

方案二：

// Java Code to illustrate toString() method
  
import java.util.*;
  
public class Currency_Demo {
    public static void main(String[] args)
    {
  
        // Creating a currency with the code
        Currency curr_ency
            = Currency.getInstance("USD");
  
        // Getting the currency code
        String currency_code
            = curr_ency.toString();
        System.out.println("Currency Code of USA is: "
                           + currency_code);
    }
}

输出：

Currency Code of USA is: USD

程序 3：对于无效的货币代码。

// Java Code to illustrate toString() method
import java.util.*;
  
public class Currency_Demo {
    public static void main(String[] args)
    {
        try {
  
            // Creating a currency with the code
            Currency curr_ency = Currency.getInstance("USDA");
  
            // Getting the currency code
            String currency_code = curr_ency.toString();
  
            System.out.println("Invalid Currency Code: "
                               + currency_code);
        }
        catch (Exception e) {
            System.out.println(e);
        }
    }
}

输出：

java.lang.IllegalArgumentException