检索方法或构造函数的调用者实例(不是类)
是否可以检索方法/构造函数的调用者实例?
这个问题已经发布,但每次答案都在谈论调用者类(使用堆栈跟踪)而不是调用者实例。 如果存在解决方案,那么构建对象图(具有公共超类型)并使用默认构造函数处理父子导航会非常方便。
public class TestCallStack {
public static class BaseClass {
BaseClass owner;
// //ok, this is the correct way to do it
// public BaseClass(BaseClass owner) {
// this.owner = owner;
// }
public BaseClass() {
//this.owner = ???????;
}
}
public static class Parent extends BaseClass {
Child child = new Child();
}
public static class Child extends BaseClass {
}
public static void main(String[] args) {
Parent parent = new Parent();
System.out.println(parent.child.owner==parent); // must be true
}
}
Is it possible to retrieve the caller instance of a method/constructor?
This question has already been posted, but each time the answers are talking about caller Class (using stacktrace) and not caller instance.
If a solution exists, it can be really convenient to build object graph (with a common super type) and handle parent child navigation with default constructor.
public class TestCallStack {
public static class BaseClass {
BaseClass owner;
// //ok, this is the correct way to do it
// public BaseClass(BaseClass owner) {
// this.owner = owner;
// }
public BaseClass() {
//this.owner = ???????;
}
}
public static class Parent extends BaseClass {
Child child = new Child();
}
public static class Child extends BaseClass {
}
public static void main(String[] args) {
Parent parent = new Parent();
System.out.println(parent.child.owner==parent); // must be true
}
}
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你的直觉是对的——这是不可能的。我个人认为这是一件好事,因为它会使代码在重构方面变得非常脆弱(想象一下将一些代码拉出到静态方法中 - 突然根本没有调用者对象)。
如果您想表达某种所有者关系,则应明确提供该所有者。
Your gut feeling is right - it's not possible. Personally I think that's a good thing, as it would make code pretty fragile with respect to refactoring (imagine pulling some code out into a static method - suddenly there's no caller object at all).
If you want to express some sort of owner relationship, you should provide that owner explicitly.