字符串变量可能尚未初始化 [英] String Variable might not have been initialized

问题描述

这是我的代码:

import java.util.Scanner;

public class empMod

{
public static void main(String[] args)
    {
    int choice;

    Scanner input = new Scanner(System.in);

    do
        {
        choice = -1;
        System.out.println("Employee Data:");
        System.out.println("1. - Employee Name:");
        System.out.println("2. - Employee Hire Date:");
        System.out.println("3. - Employee Address:");
        System.out.println("4. - Employee Number:");
        System.out.println("5. - Exit");

        choice = input.nextInt();
        input.nextLine();

        switch (choice)
            {
            case 1:

            String empName = new String ();
            System.out.println("Enter the name of the employee:");
            String name = input.nextLine();
            break;

            case 2:

            String empDate = new String ();
            System.out.println("Enter the hire date of the employee:");
            String date = input.nextLine();
            break;

            case 3:

            String empAddress = new String ();
            System.out.println("Enter the address of the employee:");
            String address = input.nextLine();
            break;

            case 4:

            String empNumb = new String ();
            System.out.println("Enter the Employee number:");
            int number = input.nextInt();
            break;

            case 5:

            System.out.print("\n");
            System.out.println("The name of the employee is: " + empName); // <-- This is the line where the error occurs.
            break;

            default:
            continue;
            }

        }
    while (choice != 6);
    } 
}

该程序的目的是让用户输入有关员工的信息，然后根据要求显示信息.当我去编译程序时，出现以下错误:

The intent of the program is to have the user input information about the employee, and then at request, have the information displayed. When I go to compile the program, I get the following error:

empMod.java:57: error: variable empName might not have been initialized
                                System.out.println("The name of the employee is:
 " + empName);

     ^

虽然在另一种情况下会初始化字符串变量，所以我不确定这个问题.

The string variable is initialized in another case though, so I am not sure of the problem.

推荐答案

empName变量仅在 case 1 部分中初始化.那么，如果从未执行此代码块，而 case 5 部分是怎么办?由于变量从未初始化为任何内容，因此会显示什么内容?

The empName variable is only initialized in the case 1 section. So what would happen if this block was never executed, and the case 5 section was? What would be printed, since the variable has never been initialized to anything?

添加

String empName = "";

在循环之前.

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