不兼容的类型:java.lang.String无法转换为String [英] incompatible types: java.lang.String cannot be converted to String
问题描述
因此,基本上我正在学习一些Java(基本ATM),但遇到了一些错误,但是很快就解决了。因此,我遇到了一个我从未听说过的新怪异错误,我进行了研究,但没有找到可以帮助我的答案。
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.
我删除了旧项目并得到了旧项目新项目中的错误
I removed the old project and get the old errors on new projects
这是我的代码:
import javax.swing.*;
public class Hej {
public static void main (String[] arg) {
JOptionPane.showMessageDialog(null, "Hej!");
}
}
这是我删除的文件上的错误大约一个月前:
And this is my error on the file that I removed about a month ago:
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
推荐答案
这是由于在与尝试访问<$的类相同的程序包中创建一个名为 String
的类引起的c $ c> java.lang.String 如Steffan和Stultuske的评论所指出。
This is caused by creating a class called String
in the same package as the class trying to access java.lang.String
as pointed out in the comments by Steffan and Stultuske.
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