java Java中接口/抽象类的动态实现
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时间：2020-10-30 17:53:01 来源:igfitidea点击:
Dynamic implementation for interface/abstract class in Java
提问by Andrey Agibalov
What's the de-facto solution for building dynamic implementation of interfaces and/or abstract classes? What I basically want is:
构建接口和/或抽象类的动态实现的事实上的解决方案是什么？我基本上想要的是：
interface IMyEntity {
int getValue1();
void setValue1(int x);
}
...
class MyEntityDispatcher implements WhateverDispatcher {
public Object handleCall(String methodName, Object[] args) {
if(methodName.equals("getValue1")) {
return new Integer(123);
} else if(methodName.equals("setValue")) {
...
}
...
}
}
...
IMyEntity entity = Whatever.Implement<IMyEntity>(new MyEntityDispatcher());
entity.getValue1(); // returns 123
回答by Joachim Sauer
It's the Proxyclass.
是Proxy班级。
class MyInvocationHandler implements InvocationHandler {
Object invoke(Object proxy, Method method, Object[] args) {
if(method.getName().equals("getValue1")) {
return new Integer(123);
} else if(method.getName().equals("setValue")) {
...
}
...
}
}
InvocationHandler handler = new MyInvocationHandler();
IMyEntity e = (IMyEntity) Proxy.newProxyInstance(IMyEntity.class.getClassLoader(),
new Class[] { IMyEntity.class },
handler);
