无法导入 java.util.Scanner
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/35909160/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
Can't import java.util.Scanner
提问by Anonymous
I have been trying to create program that lets a user input a number of eggs to buy and calculates the price. I have tried using the scanner method to input the integer, but I can't seem to import the scanner method.
我一直在尝试创建程序，让用户输入要购买的鸡蛋数量并计算价格。我曾尝试使用scanner方法输入整数，但我似乎无法导入scanner方法。
Here's what I have:
这是我所拥有的：
package eggsorder;
import java.util.Scanner;
import java.io.IOException;
public class EggsOrder {
static final double EGGS_DOZEN = 7.25;
static final double EGGS_SINGLE = 0.75;
static final int DOZEN_NUMBER = 12;
public static void main(String[] args) throws IOException {
System.out.println("Enter number of eggs for purchase: ");
Scanner enter = new Scanner(System.in);
int eggs = enter.nextInt();
System.out.println("You ordered " + eggs + "eggs.");
System.out.println("That is " + (eggs / DOZEN_NUMBER) + " dozen eggs at 7.25 per dozen and " + (eggs % DOZEN_NUMBER) + " additional eggs at 0.75 each");
System.out.println("Which is a total price of " + (((eggs % DOZEN_NUMBER) * EGGS_SINGLE) + ((eggs / DOZEN_NUMBER) * EGGS_DOZEN)));
This is the error I get after running:
这是我运行后得到的错误：
java.lang.ExceptionInInitializerError
Caused by: java.lang.RuntimeException: Uncompilable source code - cannot find symbol
symbol: class Scanner
location: class java.util
at eggsorder.EggsOrder.<clinit>(EggsOrder.java:7)
The code works without the scanner method, but it needs to use it.
该代码无需扫描仪方法即可工作，但需要使用它。
I have tried using java.util and various other variations but to no avail.
我曾尝试使用 java.util 和其他各种变体，但无济于事。
Also, I am using the latest version of NetBeans and java
另外，我使用的是最新版本的 NetBeans 和 java
采纳答案by Vikrant Kashyap
I guess you are using an IDE (like Netbeans or eclipse) which allows you to run the codeeven if certain classesare not compilable. During the application's runtime, if you access this classit would lead to this exception.
我猜您正在使用 IDE（如 Netbeans 或 eclipse），它允许您运行code即使某些classes不是compilable. 在应用程序的运行时，如果您访问class它会导致此异常。
Solution :- Simply Clean Your Project and Build and Run Then Again.
解决方案：- 只需清理您的项目并构建并再次运行。
回答by Gopal00005
Make sure you have configured PATH, CLASSPATH and JAVA_HOME variable in system Environment variable.
1) It might refers older version of java then 1.5
or
2) May be not added PATH,CLASSPATH, JAVA_HOME variable there.
确保您已经在系统环境变量中配置了 PATH、CLASSPATH 和 JAVA_HOME 变量。
1) 它可能是指旧版本的 java 然后是 1.5
或
2) 可能没有在那里添加 PATH,CLASSPATH, JAVA_HOME 变量。
BTW Your code is works fine in my Eclipse.
顺便说一句，您的代码在我的 Eclipse 中运行良好。
回答by Rudolf
Try unchecking the "Compile on save" setting in Build -> Compiling.
尝试取消选中 Build -> Compiling 中的“Compile on save”设置。
回答by NullOverFlow
you can try this
你可以试试这个
java.util.Scanner enter = new java.util.Scanner(System.in);
i tested your code and it seems to import correctly on my end. Maybe something is wrong with your IDE try resetting it
我测试了你的代码，它似乎在我端正确导入。也许您的 IDE 有问题尝试重置它
