Java-覆蓋從外部類繼承泛型的內部類時，出現“名稱沖突”和“未定義構造函數”錯誤

Question

我最近在項目中升級了eclipse和java版本，並且發生了一些錯誤。 我嘗試重現，發現以下設置導致使用Java 1.8的Eclipse Oxigen.3a（4.7.3a）中的錯誤，而對Eclipse 3.7.2和Java 1.7相同的工作

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);
     }
  }
}

在測試B類中，出現以下編譯錯誤：

1. someMethod： 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
2. 調用super（a，b）時： Description Resource Path Location Type The constructor TestA.InnerA(String, TestGeneric<TestSomeObject>.InnerGeneric) is undefined TestB.java line 22此處輸入代碼Java Problem

在eclipse版本：3.7.2和Java 1.7中，此方法有效。

這是為什么？ 如何清除錯誤？

Answer 1

答案是，要在方法簽名中更精確地定義InnerGeneric類：

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);
     }
  }
}