不在其位，不谋其政

package test;

import java.io.Serializable;
import java.util.function.Consumer;
/**

• @author gaopei 17-9-22
  /
  public class Test
  {

  public @interface Test1 {

   Class<ClassCastException> excpected();

  }

  public void LambdaTestSuccess()
  {

   Consumer<String> consumer = (Consumer<String> & Serializable) System.out::println;
   Serializable serializable = (Serializable)consumer;

  }
  @Test1(excpected = ClassCastException.class)
  public void testThrowException()
  {

   Consumer<String> consumer  = System.out::println;
   Serializable serializable = (Serializable)consumer;

  }

  public static void main(String[] args) {
  }
  }

在jdk源码中有很多的&操作符。其实这是向上类型转换。测试如上。可以编译通过。