不兼容的类型：java.lang.String 不能转换为 String
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incompatible types: java.lang.String cannot be converted to String
提问by Droxx
So basically I'm learning some java (The basics ATM) and I had a few errors but solved them pretty fast. So I got this new weird error that I've never heard about and I researched and found no answers that could help me.
所以基本上我正在学习一些Java（ATM基础知识），我有一些错误，但很快就解决了。所以我遇到了这个我从未听说过的新的奇怪错误，我进行了研究，但没有找到可以帮助我的答案。
I removed the old project and get the old errors on new projects
我删除了旧项目并在新项目中遇到了旧错误
So this is my code:
所以这是我的代码：
import javax.swing.*;
public class Hej {
public static void main (String[] arg) {
JOptionPane.showMessageDialog(null, "Hej!");
}
}
And this is my error on the file that I removed about a month ago:
这是我大约一个月前删除的文件中的错误：
C:\Users\Droxx\Documents\javamapp>javac Hej.java
.\String.java:10: error: incompatible types: java.lang.String cannot be converte
d to String
r = "Silver ";
^
.\String.java:11: error: incompatible types: java.lang.String cannot be converte
d to String
l = "2";
^
.\String.java:13: error: cannot find symbol
i = r.substring(0,1);
^
symbol: method substring(int,int)
location: variable r of type String
.\String.java:17: error: cannot find symbol
JOptionPane.showMessageDialog(null, "Level:" + a);
^
symbol: variable a
location: class String
4 errors
回答by Tim B
This is caused by creating a class called Stringin the same package as the class trying to access java.lang.Stringas pointed out in the comments by Steffan and Stultuske.
这是由于创建了一个String在与尝试访问的类相同的包中调用的类，java.lang.String如 Steffan 和 Stultuske 的评论中指出的那样。
