java - Java 8 中的 IncompatibleClassChangeError(Lambda 表达式)

Question

我正在尝试学习 lambda 表达式，所以关注 http://www.oracle.com/technetwork/articles/java/lambda-1984522.html .按照IDE和JDK下载

JDK 8 Eclipse IDE with JDK 8 support

但是当编译下面的代码后，我有一个异常

Exception in thread "main" java.lang.IncompatibleClassChangeError
    at java.lang.invoke.MethodHandleNatives.linkMethodHandleConstant(MethodHandleNatives.java:444)
    at com.ahmetk.java8.Hello.main(Hello.java:10)
Caused by: java.lang.NoSuchMethodException: no such method: java.lang.invoke.LambdaMetafactory.metaFactory(Lookup,String,MethodType,MethodHandle,MethodHandle,MethodType)CallSite/invokeStatic
    at java.lang.invoke.MemberName.makeAccessException(MemberName.java:800)
    at java.lang.invoke.MemberName$Factory.resolveOrFail(MemberName.java:917)
    at java.lang.invoke.MethodHandles$Lookup.resolveOrFail(MethodHandles.java:1101)
    at java.lang.invoke.MethodHandles$Lookup.linkMethodHandleConstant(MethodHandles.java:1363)
    at java.lang.invoke.MethodHandleNatives.linkMethodHandleConstant(MethodHandleNatives.java:442)
    ... 1 more
Caused by: java.lang.NoSuchMethodError: java.lang.invoke.LambdaMetafactory.metaFactory(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite;
    at java.lang.invoke.MethodHandleNatives.resolve(Native Method)
    at java.lang.invoke.MemberName$Factory.resolve(MemberName.java:889)
    at java.lang.invoke.MemberName$Factory.resolveOrFail(MemberName.java:914)

我尝试执行的简单代码。

public class Hello {
    interface HelloService {
        String hello(String firstname, String lastname);
    }

    public static void main(String[] args) {

        HelloService helloService = (String firstname, String lastname) -> {
            String hello = "Hello " + firstname + " " + lastname;
            return hello;
        };
        System.out.println(helloService.hello(args[0], args[1]));

    }
}

Answer 1

eclipse 在支持 java8 方面有问题。我已成功编译并在命令提示符下运行

D:\tools\java\jdk1.8.0_32Bit\bin\javac com/ahmetk/java8/Hello.java

D:\tools\java\jdk1.8.0_32Bit\bin\java -cp . com.ahmetk.java8.Hello 12 12Hello 12 12