Java动态函数创建
问题描述：
因此，我试图找出是否存在某种方法可以动态地将方法创建/分配给Java中的类.如果是C，我将使用指针按照以下步骤进行操作:
So I'm trying to figure out if there is some method to dynamically create/assign a method to a class in Java. If it were C, I would just do it as follows using pointers:
public class Foo {
void bar(void *ptr) {....}
};
int main() {
Foo f = new Foo();
f.bar({"my function" ...})
}
但是，Java当然没有指针，所以有什么办法可以从Java应用程序中获得类似的功能?
However, Java of course has no pointers, so is there any way to get a similar functionality out of a Java application?
答
在Java中，通常会声明一个带有要调用的方法的接口.例如，如果您的函数只想执行一些代码，则可以声明一个Runnable并实现其run方法.
In Java, you would normally declare an interface with a method to be called. For example, if your function simply wants to execute some code, you would declare a Runnable and implement its run method.
public class Foo {
void bar(Runnable function) {
for(int i = 0; i < 5; i++) {
function.run();
}
}
static void myFunction() {
System.out.println("my Function!");
}
public static void main(String[] ignored) {
Foo f = new Foo();
f.bar( new Runnable() { public void run() {
myFunction();
}});
}
}