As with try-as-expression, there are many other language features we can simulate with Lambdas.<\/p>\n
Another example is removing the cast commonly needed with instanceof. Kotlin has a nice feature called smart casts<\/a>, which allows you to do<\/p>\n Where x is “casted” to Duck within the block.<\/p>\n I previously blogged<\/a> how to simulate this in older Java using dynamic proxies.<\/p>\n Now in Java 8 you can do it in a slightly less terrible way, and also make it an expression at the same time.<\/p>\n More examples<\/a> and implementation<\/a> on github.<\/p>\n","protected":false},"excerpt":{"rendered":" As with try-as-expression, there are many other language features we can simulate with Lambdas. Another example is removing the cast commonly needed with instanceof. Kotlin has a nice feature called smart casts, which allows you to do if (x instanceof Duck) { x.quack(); } Where x is “casted” to Duck within the block. I previously… Read more »<\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[8],"tags":[23],"yoast_head":"\n\n\n\n\n\n\n\n\n\n\n\n\r\n if (x instanceof Duck) {\r\n x.quack();\r\n }\r\n<\/pre>\n\r\n @Test\r\n public void should_return_value_when_input_object_is_instance() {\r\n Object foo = \"ffoo\";\r\n\r\n String result = when(foo).instanceOf(String.class)\r\n .then(s -> s.substring(1))\r\n .otherwise(\"incorrect\");\r\n\r\n assertEquals(\"foo\", result);\r\n }\r\n<\/pre>\n