Java <METHOD_NAME> 的类型有误
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The type of <METHOD_NAME> is erroneous
提问by Oliver Watkins
I am getting a strange compile error in Netbeans.
我在 Netbeans 中遇到一个奇怪的编译错误。
I am creating an Experiment object and calling a run method on it.
我正在创建一个 Experiment 对象并在其上调用一个 run 方法。
Experiment experiment=new Experiment();
Result result = experiment.run(t, steps, trials, breadth, depth, seed, distribution);
The compiler complains that
编译器抱怨说
The type of run(Maplayout, int, int , int, int, long, int) is erroneous.
run(Maplayout, int, int , int, int, long, int) 的类型是错误的。
My method signature looks normal :
我的方法签名看起来很正常：
public Result run(MapLayout t, int steps, int trials,
int breadth, int depth, long seed, int distribution)
I have double checked the paramaters I am passing in and they all seem normal. If I pass in :
我已经仔细检查了我传入的参数，它们看起来都很正常。如果我传入：
experiment.run(null, 1,1,1,1,1l,1);
I get the same compile error on the run method.
我在 run 方法上遇到相同的编译错误。
Am i missing something obvious? Has too much Javascript damaged my brain?
我错过了一些明显的东西吗？太多的 Javascript 是否损坏了我的大脑？
回答by Supuhstar
I have the same problem on NetBeans 8.0. It seems that if you have this structure:
我在 NetBeans 8.0 上遇到了同样的问题。看来，如果你有这个结构：
ClassA:
ClassA：
public interface ClassA {
}
ClassB:
ClassB：
import ClassA;
public class ClassB implements ClassA {
}
ClassC:
ClassC：
import ClassB;
public class ClassC extends ClassB {
}
ClassD:
ClassD：
import ClassC;
import ClassA;
public class ClassD {
public ClassA getClassA() {
return new ClassC(); // error here
}
}
you get this error:
你得到这个错误：
path\to\ClassC.java:7: error: The type of new ClassC() is erroneous
return new ClassC();
^
because ClassCdoes not explicitly implement ClassA, the compiler doesn't know if the type is correct. I fixed it by making ClassCimplement ClassA, even though it already extends ClassB:
因为ClassC没有显式实现ClassA，编译器不知道类型是否正确。我通过制作ClassC工具修复了它ClassA，即使它已经扩展了ClassB：
new ClassC:
新ClassC：
import ClassA;
import ClassB;
public class ClassC extends ClassB implements ClassA {
}
回答by mmavcy
You might need to import Result in the Experiment class.
您可能需要在 Experiment 类中导入 Result。
I just had the same problem and it was because of that.
我只是遇到了同样的问题，正因为如此。
回答by George Siggouroglou
I had the same issue and the solution was very simple in my case.
我遇到了同样的问题，就我而言，解决方案非常简单。
The case:
I copy/paste some classes from another project in a package of the project i am working in.
Some of them had the old package declaration and the compiler didn't complained (for his reasons).
When i used a method with return type one of the 'wrong packaged' classes this error appeared.
(The Type of is erroneous)
案例：
我将另一个项目中的一些类复制/粘贴到我正在工作的项目的一个包中。
其中一些具有旧的包声明并且编译器没有抱怨（出于他的原因）。
当我使用返回类型为“错误打包”类之一的方法时，出现此错误。
（类型错误）
The solution
To solvethe issue, I changed the package declaration to be the correct one!
解决方案
为了解决这个问题，我将包声明更改为正确的！
回答by cslysy
In my case (Netbeans 8.0.2) restart helps
在我的情况下（Netbeans 8.0.2）重启有帮助
回答by Jigar Shah
Just do a clean and build on the project again. Most of the time this is the error specific to Netbeans.
只需清理并再次构建项目即可。大多数情况下，这是 Netbeans 特有的错误。
回答by dellasavia
I faced this issue on Netbeans 7.4. Tried to reopen IDE, clean and rebuild but does not solve. In my case, there was an implementsclause on the erroneuos class. I removed this clause, declare it again and so the error has gone.
我在 Netbeans 7.4 上遇到了这个问题。尝试重新打开IDE，清理并重建但没有解决。在我的例子中，有一个implements关于 erroneuos 类的条款。我删除了这个子句，再次声明它，所以错误消失了。
