java – 创建Util类

发布时间：2020-12-15 02:30:24 所属栏目：Java 来源：网络整理

导读：我创建了一个货币fomatter类.我希望它是一个util类,可以被其他应用程序使用. 现在我只是取一个字符串,而不是我希望它由导入我的currencyUtil.jar的应用程序设置 public class CurrencyUtil{ public BigDecimal currencyUtil(RenderRequest renderRequest,Ren

我创建了一个货币fomatter类.我希望它是一个util类,可以被其他应用程序使用.
现在我只是取一个字符串,而不是我希望它由导入我的currencyUtil.jar的应用程序设置

public class CurrencyUtil{
  public BigDecimal currencyUtil(RenderRequest renderRequest,RenderResponse renderResponse)
        throws IOException,PortletException {
        BigDecimal amount = new BigDecimal("123456789.99");  //Instead I want the amount to be set by the application.      
        ThemeDisplay themeDisplay = 
             (ThemeDisplay)renderRequest.getAttribute(WebKeys.THEME_DISPLAY);
        Locale locale = themeDisplay.getLocale();

        NumberFormat canadaFrench = NumberFormat.getCurrencyInstance(Locale.CANADA_FRENCH);
        NumberFormat canadaEnglish = NumberFormat.getCurrencyInstance(Locale.CANADA);
        BigDecimal amount = new BigDecimal("123456789.99");
        DecimalFormatSymbols symbols = ((DecimalFormat) canadaFrench).getDecimalFormatSymbols();
        symbols.setGroupingSeparator('.');
        ((DecimalFormat) canadaFrench).setDecimalFormatSymbols(symbols);

    System.out.println(canadaFrench.format(amount));
        System.out.println(canadaEnglish.format(amount));     
    //Need to have a return type which would return the formats
     return amount;
    }
}

让其他应用程序调用这个util类

import com.mypackage.CurrencyUtil;
 ...
 public int handleCurrency(RenderRequest request,RenderResponse response) {
String billAmount = "123456.99";
    CurrencyUtil CU = new currencyUtil();
//Need to call that util class and set this billAmount to BigDecimal amount in util class.
//Then it should return both the formats or the format I call in the application.
   System.out.println(canadaEnglish.format(billAmount);  //something like this
}

我做了什么改变？

解决方法

您需要创建CurrencyUtil类的对象.

CurrencyUtil CU = new CurrencyUtil();
//To call a method,BigDecimal value=CU.currencyUtil(request,response);

我建议currenyUtil方法应该是静态的,它需要三个参数.

public class CurrencyUtil
 {
  public static BigDecimal currencyUtil(
                RenderRequest renderRequest,RenderResponse renderResponse,String amountStr) throws IOException,PortletException 
    {
       BigDecimal amount = new BigDecimal(amountStr); 
       ...
    }
 }

你可以打电话给,

BigDecimal value=CurrencyUtil.currencyUtil(request,response,billAmount);

（编辑：李大同）

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