泛型和桥方法。

[url]http://docs.oracle.com/javase/tutorial/java/generics/bridgeMethods.html
[/url]

import java.lang.reflect.Method;
import java.util.Arrays;

public class TestBridgeMethod {
	public static void main(String[] args) {
			
		Class<?> clazz = S.class;
		Method[] methods = clazz.getMethods();
		for(Method method : methods) {
			if (method.isBridge())
			{
				System.out.println(method.getName() + ":" + Arrays.toString(method.getParameterTypes()) );
			}
		}
		
	}
}

class P<T> {
	public T test (T t){
		return t;
	}
}

class S extends P<String> {
	@Override
	public String test(String t) {
		return t;
	}
}

桥方法是 test:[class java.lang.Object]