Java

Question

最近在项目中升级了eclipse和java版本，出现了一些错误。我尝试重现并发现以下设置导致使用 Java 1.8 在 Eclipse Oxigen.3a (4.7.3a) 中出现错误，而同样适用于 eclipse 3.7.2 和 Java 1.7

TestSomeObject.java:

package a;
public class TestSomeObject
{
}

TestGeneric.java:

package a;
public class TestGeneric<T>
{
  T element;

  protected class InnerGeneric
  {
     T innerElement;

     public InnerGeneric() { }
  }
}

TestA.java:

package a;

public class TestA extends TestGeneric<TestSomeObject>
{
  public TestA(String a, String b) {}

  public InnerA someMethod(String some, InnerGeneric inner)
  {
     return new InnerA(some, inner);
  }

  protected class InnerA
  {
     public InnerA(String a, InnerGeneric b) {  }
  }
}

TestB.java

package a;
import a.TestA;

public class TestB extends TestA
{
  public TestB(String a, String b){
     super(a,b);
  }

  public InnerA someMethod(String some, InnerGeneric inner)
  {
     return new InnerB(some, inner);
  }

  protected class InnerB extends InnerA
  {
     public InnerB(String a, InnerGeneric b)
     {
        super(a, b);
     }
  }
}

在class测试B中，我得到以下编译错误：

一些方法：Description Resource Path Location Type Name clash: The method someMethod(String, TestGeneric<TestSomeObject>.InnerGeneric) of type TestB has the same erasure as someMethod(String, TestGeneric<TestSomeObject>.InnerGeneric) of type TestA but does not override it TestB.java line 13 Java Problem
调用 super(a,b) 时：Description Resource Path Location Type The constructor TestA.InnerA(String, TestGeneric<TestSomeObject>.InnerGeneric) is undefined TestB.java line 22在此处输入代码Java Problem

在 eclipse 版本：3.7.2 和 Java1.7 中，这有效。

这是为什么？我该怎么做才能清除错误？

Answer 1

答案是，更精确地定义方法签名中的 InnerGeneric class：

TestB.java:

package a;

public class TestB extends TestA
{
  public TestB(String a, String b){
     super(a,b);
  }

  public InnerA someMethod(String some, TestGeneric<TestSomeObject>.InnerGeneric inner)
  {
     return new InnerB(some, inner);
  }

  protected class InnerB extends InnerA
  {
     public InnerB(String a, TestGeneric<TestSomeObject>.InnerGeneric b)
     {
        super(a, b);
     }
  }
}

Java - 'Name clash' 和 'constructor undefined' 覆盖从外部 class 继承泛型的内部 class 时出错

Java - 'Name clash' and 'constructor undefined' error when overriding inner class that inherits a generic from the outer class

eclipse

name-clash