爪哇Lambda至Kotlin

Question

我正在用Kotlin建立我的代码

我在Kotlin中使用Lambda时遇到以下问题：

Java代码：

  ((UndertowEmbeddedServletContainerFactory) container)
        .addBuilderCustomizers(builder ->
        builder.setServerOption(UndertowOptions.ENABLE_HTTP2, true));

使用公共接口实例化

((UndertowEmbeddedServletContainerFactory) container)
            .addBuilderCustomizers(new UndertowBuilderCustomizer() {
                @Override
                public void customize(Builder builder) {
                    builder.setServerOption(UndertowOptions.ENABLE_HTTP2, true);
                }
            });

我在Kotlin的代码

val c: UndertowEmbeddedServletContainerFactory = (container as UndertowEmbeddedServletContainerFactory)
// Calling the Lambda
c.addBuilderCustomizers{ (b: Builder) -> b.setServerOption(UndertowOptions.ENABLE_HTTP2, true) }

这给了我一个语法错误：

Multiple markers at this line - Passing value as a vararg is only allowed inside a parenthesized argument list - Cannot infer a type for this parameter. Please specify it explicitly.

正确的语法可能是什么

Answer 1

您需要稍微帮助Kotlin编译器，并告诉它这个lambda的类型。这段代码应该可以编译并正常工作：

        c.addBuilderCustomizers(UndertowBuilderCustomizer{ it.setServerOption(UndertowOptions.ENABLE_HTTP2, true)})