[英]How can I instantiate a JRuby class that implements a Java interface in Java
[英]How to specify in JRuby that a Ruby class implements several java interfaces
I know the syntax to specify that a Ruby class implements one java interface in JRuby, but I don't know how to specify if we want the class to implement more than one interface.
我嘗試的是:
class MyClass
java_implements 'org.scripthelper.ruby.samples.Script'
java_implements 'org.scripthelper.context.ContextListener'
我也試過:
class MyClass
java_implements 'org.scripthelper.ruby.samples.Script', 'org.scripthelper.context.ContextListener'
但是當我嘗試投射時我有一個例外
Object o1 = object.toJava(Interface1.class);
Object o2 = object.toJava(ContextListener.class);
但奇怪的是,對於第二個界面,我有以下異常:
rg.jruby.exceptions.TypeError: (TypeError) cannot convert instance of class org.jruby.gen.RubyObject1 to interface org.scripthelper.context.ContextListener
(TypeError) cannot convert instance of class org.jruby.gen.RubyObject1 to interface org.scripthelper.context.ContextListener
我的 ContextListener 接口有以下 Java 代碼:
public void init(ScriptContext context);
而我的Ruby class如下:
require 'java'
import 'org.scripthelper.context.ScriptContext'
import 'org.scripthelper.context.ContextListener'
import 'org.scripthelper.context.DefaultScriptContext'
class ScriptClass
java_implements 'org.scripthelper.context.ContextListener', 'org.scripthelper.ruby.samples.Script'
attr_reader :ctx
def init(context)
@ctx = context
end
def execute()
return 10
end
end
只需在您的界面中使用普通的舊包含:
class ScriptClass
include org.scripthelper.context.ContextListener
include org.scripthelper.ruby.samples.Script
attr_reader :ctx
def init(context)
@ctx = context
end
def execute()
return 10
end
end
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