例如,给定一个Java类:
public class Foo {
public String bar(String x) {
return "string " + x;
}
public String bar(Integer x) {
return "integer " + x;
}
}
如何在Clojure中继承Foo并仅覆盖bar(String)方法,但重用原始Foo类中的bar(Integer)。像这样的东西(但这不起作用):
(let [myFoo (proxy [Foo] []
(bar [^String x] (str "my " x)))]
(println "with string: " (.bar myFoo "abc"))
(println "with integer: " (.bar myFoo 10)))
此示例将打印:
with string: my abc
with integer: my 10
但我希望得到以下效果:
with string: my abc
with integer: integer 10
答案 0 :(得分:3)
我猜这不是你的意思,但在此期间,你可以明确检查参数的类型,并使用proxy-super
在Foo
上调用原始方法。
(let [myFoo (proxy [Foo] []
(bar [x]
(if (instance? String x)
(str "my " x)
(proxy-super bar x))))]
(println "with string: " (.bar myFoo "abc"))
(println "with integer: " (.bar myFoo 10)))