在这个例子中 - http://jscience.org/api/javax/measure/package-summary.html,当我尝试在clojure中运行时,我收到错误。
(import 'javax.measure.unit.SI)
(import 'javax.measure.Measure)
(Measure/valueOf 2 SI/KILOGRAM)
;; => More than one matching method found: valueOf
[Thrown class java.lang.IllegalArgumentException]
到底有没有?
实际的java代码是这样的:
public static <Q extends Quantity> Measure<java.lang.Integer, Q> valueOf(
int intValue, Unit<Q> unit) {
return new Integer<Q>(intValue, unit);
}
public static <Q extends Quantity> Measure<java.lang.Float, Q> valueOf(
float floatValue, Unit<Q> unit) {
return new Float<Q>(floatValue, unit);
}
我得到的错误是:
More than one matching method found: valueOf [Thrown class java.lang.IllegalArgumentException] Restarts: 0: [QUIT] Quit to the SLIME top level Backtrace: 0: Compiler.java:2360 clojure.lang.Compiler.getMatchingParams 1: Compiler.java:1555 clojure.lang.Compiler$StaticMethodExpr. 2: Compiler.java:938 clojure.lang.Compiler$HostExpr$Parser.parse 3: Compiler.java:6455 clojure.lang.Compiler.analyzeSeq 4: Compiler.java:6262 clojure.lang.Compiler.analyze 5: Compiler.java:6223 clojure.lang.Compiler.analyze 6: Compiler.java:5618 clojure.lang.Compiler$BodyExpr$Parser.parse 7: Compiler.java:5054 clojure.lang.Compiler$FnMethod.parse 8: Compiler.java:3674 clojure.lang.Compiler$FnExpr.parse 9: Compiler.java:6453 clojure.lang.Compiler.analyzeSeq
答案 0 :(得分:2)
很可能您正在调用静态重载方法(即Measure.valueOf(double, Unit)
vs Measure.valueOf(float, Unit)
)。尝试将您的值转换为所需类型(假设您要调用Measure/valueOf(float, Unit)
:
(Measure/valueOf (float 2) SI/KILOGRAM)
答案 1 :(得分:2)
刚试了一下就可以了:
(Measure/valueOf (Integer. 2) SI/KILOGRAM)
就像这样:
(Measure/valueOf (cast Long 2) SI/KILOGRAM)
答案 2 :(得分:1)
以下是几个基本的演员示例:
(import 'javax.measure.unit.SI)
(import 'javax.measure.Measure)
; Integer Value
; will call:
; public static <Q extends Quantity> Measure<java.lang.Integer, Q> valueOf
(Measure/valueOf (Integer. 2) SI/KILOGRAM)
; Long value
; will call:
; public static <Q extends Quantity> Measure<java.lang.Long, Q> valueOf
(Measure/valueOf (cast Long 2) SI/KILOGRAM)
; Float value
; will call:
; public static <Q extends Quantity> Measure<java.lang.Float, Q> valueOf
(Measure/valueOf (Float. 2.0) SI/KILOGRAM)