我正在使用groovy代码来创建地图列表。但是当我试图在列表中添加地图时,它给了我异常
groovy.lang.MissingMethodException: No signature of method: java.util.ArrayList.getAt() is applicable for argument types: (HashMap) values: [[:]]
Possible solutions: getAt(int), getAt(groovy.lang.Range), getAt(groovy.lang.EmptyRange), getAt(int), getAt(java.lang.String), getAt(java.util.Collection)
at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.unwrap(ScriptBytecodeAdapter.java:58)
at org.codehaus.groovy.runtime.callsite.PojoMetaClassSite.call(PojoMetaClassSite.java:49)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:125)
at
at sun.reflect.GeneratedMethodAccessor146.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:93)
at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:325)
at org.codehaus.groovy.runtime.metaclass.ClosureMetaClass.invokeMethod(ClosureMetaClass.java:294)
at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1037)
at groovy.lang.Closure.call(Closure.java:415)
at groovy.lang.Closure.call(Closure.java:431)
at org.codehaus.groovy.runtime.DefaultGroovyMethods.each(DefaultGroovyMethods.java:2187)
at org.codehaus.groovy.runtime.DefaultGroovyMethods.each(DefaultGroovyMethods.java:2172)
at org.codehaus.groovy.runtime.DefaultGroovyMethods.each(DefaultGroovyMethods.java:2213)
at org.codehaus.groovy.runtime.dgm$166.invoke(Unknown Source)
at org.codehaus.groovy.runtime.callsite.PojoMetaMethodSite$PojoMetaMethodSiteNoUnwrapNoCoerce.invoke(PojoMetaMethodSite.java:274)
at org.codehaus.groovy.runtime.callsite.PojoMetaMethodSite.call(PojoMetaMethodSite.java:56)
at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:48)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:113)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:125)
at ]
at Current(Unknown Source)
at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCallCurrent(CallSiteArray.java:52)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callCurrent(AbstractCallSite.java:154)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callCurrent(AbstractCallSite.java:190)
at at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
所以我改变了我的代码java风格,但我得到了同样的异常
以下是我的代码
List<Map<String,String>> data = new ArrayList()
Map<String,String> map = new HashMap()
datas.each{adv ->
if(adv.data.equalsIgnoreCase("myData)){
map.put("id",adv.id)
map.put("url", adv.url)
}
}
data.add(map)//getting exception at this point
答案 0 :(得分:1)
以下代码应该适合您,
List data = []
Map map = [:]
datas.each{adv ->
map = [:] //emptying map
if(adv.data.equalsIgnoreCase("myData)){
map["id"] = adv.id
map["url"] = adv.url
}
data << map // inserting map into list
}
println data.dump() // printing list of maps