Java NumberFormat setCurrency()用法及代碼示例

setCurrency()方法是java.text.NumberFormat的內置方法，用於設置格式化貨幣值時此數字格式使用的貨幣。這不會更新數字格式使用的最小或最大小數位數。它會覆蓋最初的貨幣。

用法:

public void setCurrency(Currency currency)

參數：該函數接受強製性參數Currency，該參數指定要設置的貨幣。

返回值：該函數不返回任何內容，因此返回類型為void。

錯誤和異常：該函數引發兩種類型的異常，如下所述：

UnsupportedOperationException：如果數字格式類未實現貨幣格式設置，則會拋出該錯誤
NullPointerException 如果currency為null則拋出

下麵是上述函數的實現：

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()); 
    } 
}

輸出：

Initially Currency: USD
Currency set as: CAD

示例2:

// 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); 
        } 
    } 
}

輸出：

Initially Currency: USD
Exception is: java.lang.NullPointerException

參考： https://docs.oracle.com/javase/10/docs/api/java/text/NumberFormat.html#setCurrency(java.util.Currency)

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