Question

你在这里看到的是我的两个应用程序之一，一个用于创建类和变量，第二个用于获取信息并显示它。

package ch7;


import java.util.Calendar;

public class Dealership {

// public static final class variables

public static final int YEAR_STARTED = 1995;
public static final String COMPANY_NAME = "The Rusty Lemon";
public static final String COMPANY_URL = "www.TheRustyLemon.com";
public static final String COMPANY_ADDRESS = 
            "123 Rustbelt Road, Somewhere, SomeState, 12345";
public static final String COMPANY_SLOGAN = 
                    "Many parts of our cars run great!";
public static final double STANDARD_MARKUP = 0.50;
    public static final String COMPANY_EMAIL = "contact@therustylemon.com";


// public static methods
    public static int getYearsInBusiness () {
        int yearsOperating = 0;
        int currentYear = Calendar.getInstance().get(Calendar.YEAR); 
        yearsOperating = currentYear - YEAR_STARTED;
        return yearsOperating;
    }

public static String getCompanyBanner () {
    return COMPANY_NAME + "\n(Selling rusty lemons since " + 
        YEAR_STARTED + ")\n" + COMPANY_ADDRESS + "\n" +
        COMPANY_URL + "\n" + COMPANY_SLOGAN + "\n";
}

public static double getRetailPrice (double dealerCost, 
                        double cleaningCost) {
    double markup = dealerCost * STANDARD_MARKUP;
    return dealerCost + cleaningCost + markup;
}

static String COMPANY_EMAIL() {
    throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
}
}

这是第二位代码。现在，当我运行它时，它将成功构建并运行但我在输出方面没有得到任何东西，即使我做了一些简单的事情

System.out.println("hi");

没什么，老实说，我无法弄清楚为什么在天堂会发生这种情况。

public class Rusty1
{
public static void main(String[] args) 
{
    String message1 = Dealership.getCompanyBanner();
    int message2 = Dealership.getYearsInBusiness();
    String message3 = Dealership.COMPANY_EMAIL();
    System.out.print(message1);
    System.out.print("We've been operating now for " + message2 + " years! To talk to one of our sales people, send an email to" + message3);
}

}

Answer 1

在主方法中调用Dealership.COMPANY_EMAIL()时会出现异常。

static String COMPANY_EMAIL() {
throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
}

netbeans中的异常跟踪：

运行：线程＆＃34; main＆＃34;中的例外情况java.lang.UnsupportedOperationException：尚不支持。在javaapplication1.Dealership.COMPANY_EMAIL（经销商.java：46）在javaapplication1.Rusty1.main（Rusty1.java:18） Java结果：1 建立成功（总时间：3秒）

Answer 2

我编辑了你的方法：

static String COMPANY_EMAIL() {

 if(COMPANY_EMAIL==null)
     throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
else
    return COMPANY_EMAIL;

}

因此，如果电子邮件不存在或不受支持，则抛出异常。

此异常也会给您的程序带来问题，我建议您使用这样的方法：

static String COMPANY_EMAIL() {

  if(COMPANY_EMAIL==null || COMPANY_EMAIL.equals(""))
      return ("Email Function Not supported yet."); //return not supported
 else
     return COMPANY_EMAIL;    //return original email

}

Java应用程序运行但没有别的

2 个答案: