java - 从类和接口(interface)重新继承静态字段

Question

interface A {
    public static String name = "A";
}
interface B {
    public static String name = "B";
}
class X implements A { }
class Y extends X implements B { }
public void test_getField() {
    try {
        assertEquals(B.class.getField("name"), Y.class.getField("name"));
    } catch (NoSuchFieldException e) {
        fail("Got exception");
    }
}

为什么 Y.class.getField("name") 返回 B.name 而不是 A.name？Java规范中有没有答案？

Answer 1

将在父类(super class)之前搜索直接超接口(interface)，参见 doc getField 的:

The field to be reflected is determined by the algorithm that follows.Let C be the class represented by this object:

If C declares a public field with the name specified, that is thefield to be reflected.

If no field was found in step 1 above, thisalgorithm is applied recursively to each direct superinterface of C.The direct superinterfaces are searched in the order they weredeclared.

If no field was found in steps 1 and 2 above, and C has asuperclass S, then this algorithm is invoked recursively upon S. If Chas no superclass, then a NoSuchFieldException is thrown.