JDK Proxy demo

问题：

解决：

完整代码： https://gitee.com/giant35/proxy1

App.java

package demo;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Proxy;  

public class App {
    public static void main(String[] args) {
        final InvocationHandler h = new TestInvocationHandler();
        C c = (C) Proxy.newProxyInstance(App.class.getClassLoader(), new Class[]{C.class}, h);
        var r = c.plus(1, 2);
        System.out.println("r:" + r);
    }
}

package demo;

import java.lang.reflect.InvocationHandler;

import java.lang.reflect.Proxy;

public class App {

public static void main(String[] args) {

final InvocationHandler h = new TestInvocationHandler();

C c = (C) Proxy.newProxyInstance(App.class.getClassLoader(), new Class[]{C.class}, h);

var r = c.plus(1, 2);

System.out.println("r:" + r);

}

C.java

package demo;

public interface C {
    int plus(int a, int b);
}

package demo;

public interface C {

int plus(int a, int b);

}

TestInvocationHandler.java

package demo;

import org.apache.commons.lang3.StringUtils;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;

public class TestInvocationHandler implements InvocationHandler {
    @Override
    public Object invoke(final Object proxy, final Method method, final Object[] args) throws Throwable {
        System.out.println("proxy.class:" + proxy.getClass() + " method: " + method + " args:" + StringUtils.join(args, ","));
        return (int) args[0] + (int) args[1];
    }
}

package demo;

import org.apache.commons.lang3.StringUtils;

import java.lang.reflect.InvocationHandler;

import java.lang.reflect.Method;

public class TestInvocationHandler implements InvocationHandler {

@Override

public Object invoke(final Object proxy, final Method method, final Object[] args) throws Throwable {

System.out.println("proxy.class:" + proxy.getClass() + " method: " + method + " args:" + StringUtils.join(args, ","));

return (int) args[0] + (int) args[1];

}

参考：

IT问题

程序员的疑难杂症录

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