Question

所以这是我的作业，对我而言，它似乎是一个可变范围的问题。我已经尝试定义一个全局，但也许我做错了，因为这似乎也不满足我的编译器。我目前正在使用SublimeText2进行代码编写，但似乎没什么帮助。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default个语句都没有匹配，则需要case个案例。

Answer 2

扩展路易斯的回答：改变

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

要

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

我在那里保持乘法以保持计算相同，所以如果“没有奖金”的概念变成“没有个人奖励，但给予每个没有奖励的所有人0.5％”{{1} }可以设置为0.5％，它会工作。不太可能，但这只是为什么它是这样的一个例子。否则，只需将NO_BONUS设置为0或employeeBonus即可。由你决定。

Answer 3

问题是您的第54行System.out.println("Employee Bonus $" + employeeBonus);正在提供编译时错误 本地变量employeeBonus可能尚未初始化

这可以通过在＃18行初始化employeeBonus变量来解决：double employeeBonus = 0;或者

在您的switch语句中添加default个案例，如下所示：

default:
    employeeBonus = 0;

Answer 4

在方法（局部变量）中声明变量时，必须在使用变量之前初始化局部变量。在您的情况下，为employeeBonus提供默认值。

使用switch语句后变量不可用？

4 个答案: