原因:推断类型不符合上限

ele*_*ect 6 java arrays generics java-8

我试图寻找类似的答案,但我还没有得到/找到解决方案,然后我直接要求暴露我的情况

我有一个静态函数 validate

    private static void validate(AiNode pNode) {
        ...
            for (AiNode child : pNode.mChildren) {
                doValidation(child.mMeshes, child.mMeshes.length, "a", "b");
            }
        }
    }
Run Code Online (Sandbox Code Playgroud)

pNode.mChildren是一个数组AiNode

这是我的 doValidation

private static <T> void doValidation(T[] pArray, int size, String firstName, String secondName) {

        // validate all entries
        if (size > 0) {

            if (pArray == null) {

                throw new Error("aiScene." + firstName + " is NULL (aiScene." + secondName + " is " + size + ")");
            }
            for (int i = 0; i < size; i++) {

                if (pArray[i] != null) {

                    validate(parray[i]);
                }
            }
        }
    }
Run Code Online (Sandbox Code Playgroud)

但我不断收到此错误

method doValidation in class ValidateDataStructure cannot be applied to given types;
  required: T[],int,String,String
  found: int[],int,String,String
  reason: inferred type does not conform to upper bound(s)
    inferred: int
    upper bound(s): Object
  where T is a type-variable:
    T extends Object declared in method <T>doValidation(T[],int,String,String)
----
(Alt-Enter shows hints)
Run Code Online (Sandbox Code Playgroud)

我认为这与java中的原始类型数组扩展了Object []有关,确实如果我切换T[]T它可以工作,但是我不能再循环它了......我不知道如何解决它或哪个解决方案最适合我的情况。

这个想法是validate(T[] array)基于数组T类型有不同的

Tag*_*eev 3

你的数组是int[],不是Integer[]。将其转换为Integer[]使用

for (AiNode child : pNode.mChildren) {
    Integer[] meshes = Arrays.stream(child.mMeshes).boxed().toArray(Integer::new);
    doValidation(meshes, child.mMeshes.length, "a", "b");
}
Run Code Online (Sandbox Code Playgroud)