JDeferred是一个Java的Deferred/Promise库，类似jQuery的Deffered对象。
示例代码：
Deferreddeferred=ewDeferredObject();Promisepromise=deferred.promise();promise.doe(ewDoeCallback(){publicvoidoDoe(Objectresult){...}}).fail(ewFailCallback(){publicvoidoFail(Objectrejectio){...}}).progress(ewProgressCallback(){publicvoidoProgress(Objectprogress){...}}).always(ewAlwaysCallback(){publicvoidoAlways(Statestate,Objectresult,Objectrejectio){...}});
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