java - 使用 switch 语句后变量不可用？

Question

所以这是我的作业，对我来说这似乎是一个可变范围的问题。我尝试定义一个全局变量，但也许我做得不正确，因为这似乎也不能让我的编译器满意。我目前正在使用 SublimeText2 来编写代码，但它似乎没有太大帮助。我应该使用 Eclipse 或 Aptana Studio 等 IDE 吗？

// EmployeeBonus2.java - This program calculates an employee's yearly bonus.

import javax.swing.*;

public class EmployeeBonus2
{
    public class Globals {
    public double employeeBonus;
}
  public static void main(String args[])
  {
    // Declare and initialize variables.
    String employeeName;
    String salaryString;
    double employeeSalary;
    String ratingString;
    int employeeRating;
    double employeeBonus;
    final double BONUS_1 = .15;
    final double BONUS_2 = .10;
    final double BONUS_3 = .06;
    final double NO_BONUS = 0.00;
    final int RATING_1 = 1;
    final int RATING_2 = 2;
    final int RATING_3 = 3;

    // This is the work done in the housekeeping() method
    // Get user input.
    employeeName = JOptionPane.showInputDialog("Enter employee's name: ");
    salaryString = JOptionPane.showInputDialog("Enter employee's yearly salary: ");
    ratingString = JOptionPane.showInputDialog("Enter employee's performance rating: ");

    // Convert Strings to int or double.
    employeeSalary = Double.parseDouble(salaryString);
    employeeRating = Integer.parseInt(ratingString);


        switch(employeeRating)
      {
        case 1: employeeBonus = (employeeSalary * BONUS_1);
        break;
        case 2: employeeBonus = (employeeSalary * BONUS_2);
        break;
        case 3: employeeBonus = (employeeSalary * BONUS_3);
        break;
      };


    // This is the work done in the endOfJob() method
    // Output.
    System.out.println("Employee Name " + employeeName);
    System.out.println("Employee Salary $" + employeeSalary);
    System.out.println("Employee Rating " + employeeRating);
    System.out.println("Employee Bonus $" + employeeBonus);

    System.exit(0);
    }
}

尝试编译时出现此错误。

EmployeeBonus2.java:54: variable employeeBonus might not have been initialized
    System.out.println("Employee Bonus $" + employeeBonus);

Answer 1

如果没有任何 case 语句匹配，您需要一个 default case。