Java printf 语句给出错误

Question

我在一项家庭作业中使用 Eclipse，但我真的很挣扎。目标是编写一个工资单程序，让用户输入他们的姓名、工作时间、工资率、联邦和州预扣税，然后输出计算出的预扣金额以及净工资信息。

我使用了我熟悉的 println 语句来显示输出，但老师希望我们使用 System.out.printf 函数，但我根本无法让它工作。如果我使用 println 语句，所有值都会被填充，但由于某种原因，我无法让 printf 执行相同的操作。我缺少什么？如果我使用 printf 函数，它会给我错误

"Exception in thread "main" java.lang.Error: Unresolved compilation problem: 
    The method printf(Locale, String, Object[]) in the type PrintStream is not applicable for the arguments (String, String, String)
at Payrolls.main(Payrolls.java:31)"

这是我的代码:

import java.util.Scanner;

public class Payrolls
{
   public static void main(String []args)
   {


   Scanner input = new Scanner(System.in);

   System.out.print("Enter employee first name: ");
   String employeeFirst = input.nextLine();

   System.out.print("Enter employee last name: ");
   String employeeLast = input.nextLine();

   System.out.print("Enter number of hours worked this week: ");
   int hoursWorked = input.nextInt();

   System.out.print("Enter hourly pay rate of the employee: ");
   double payRate = input.nextDouble();

   System.out.print("Enter federal tax withholding rate: ");
   double fedTax = input.nextDouble();

   System.out.print("Enter state tax withholding rate: ");
   double stateTax = input.nextDouble();

   System.out.println(" ");
   System.out.println(" ");
   //System.out.printf("%-20s %s\n", employeeFirst, employeeLast);
   System.out.println("Name: " + employeeFirst +" " +employeeLast);

   System.out.println("Hours Worked:" + hoursWorked);

   System.out.println("Pay Rate:" + payRate);



   double grossPay;
   grossPay = payRate * hoursWorked;

   System.out.println("Gross Pay:" + grossPay);

   double deductions;
   deductions = grossPay * fedTax;

   System.out.println("\tDeductions:");
   System.out.println("\t\tFederal Witholding %: $" +  deductions);

   double statTax;
   statTax = grossPay * stateTax;

   System.out.println("\t\tState Witholding %: $" +  statTax);

   double totalDeduction;
   totalDeduction = deductions + statTax;

   System.out.println("\t\tTotal Deduction: $" + totalDeduction);


   double netPay;
   netPay = grossPay - totalDeduction;

   System.out.println("Net Pay:" + netPay);
   }
}

Answer 1

• Printf 方法可从 java 版本 1.5 开始使用。确保您的jdk版本大于或等于1.5。
• 您的错误告诉您 printf 方法的第一个参数必须是 Locale 类型，请参阅示例 here