object

问题 I have a simple function: function pagination(opt, limit){ console.log(opt); //logs out this-> [Object { limit="2", layout="getConversations"}] if (typeof opt === 'object') { var list = { data: [opt] } list.data['limitstart'] = 24; //undefined console.debug(data); //here it should list three key value pairs including limitstart which just added } } I tried this: list.data.push({ 'limitstart': 24 }); //creates another object. expected output: [Object { limit="2", layout="getConversations",

问题 I have a simple function: function pagination(opt, limit){ console.log(opt); //logs out this-> [Object { limit="2", layout="getConversations"}] if (typeof opt === 'object') { var list = { data: [opt] } list.data['limitstart'] = 24; //undefined console.debug(data); //here it should list three key value pairs including limitstart which just added } } I tried this: list.data.push({ 'limitstart': 24 }); //creates another object. expected output: [Object { limit="2", layout="getConversations",

问题 This question already has answers here : Convert ArrayList<String> to String[] array [duplicate] (6 answers) Convert list to array in Java [duplicate] (11 answers) Closed 7 years ago . List<String> list = getNames();//this returns a list of names(String). String[] names = (String[]) list.toArray(); // throws class cast exception. I don't understand why ? Any solution, explanation is appreciated. 回答1: This is because the parameterless toArray produces an array of Object s. You need to call the

问题 I have the following example code, creating a object collection. How can I remove one of the objects? (e.g. $TestList would look as though the "delete me" item was never there. I've tried .remove, .splice, .delete etc but I'm told it's not a function. Doing typeof($TestList) brings back object, and typeof($TestList[0]) also seems valid. Surely I don't have to recreate the collection without one item? (function($) { jQuery.QuickTest = { $TestList: {}, build: function() { $TestList={};

问题 This question already has answers here : Closed 9 years ago . Possible Duplicate: Why are C# 3.0 object initializer constructor parentheses optional? What is the difference between instatiating an object by using classInstance = new Class() { prop1 = "", prop2 = "" }; and classInstance = new Class { prop1 = "", prop2 = "" }; 回答1: Nothing. The second is just a short-cut for the first. The first allows you to include arguments to a constructor. So, you can't use the short-cut if the class doesn

问题 I try to dive deeper and understand the differences between Public | Private | Protected in a low level perspective, in C++. How are the differences between the three expressed in the memory? 回答1: private , public and protected does not cause members to be stored in specific regions of memory. The access is checked by the compiler. On the very lowest level, there is no difference. However, access specifiers do have an effect on what guarantees you get on the order in which class members are

问题 I try to dive deeper and understand the differences between Public | Private | Protected in a low level perspective, in C++. How are the differences between the three expressed in the memory? 回答1: private , public and protected does not cause members to be stored in specific regions of memory. The access is checked by the compiler. On the very lowest level, there is no difference. However, access specifiers do have an effect on what guarantees you get on the order in which class members are

问题 I have a sample class, say Country : class Country { public String name; public int population; public Flag flag; ... } I have this Flag class defined somewhere else class Flag { String id; int pixel; ... } Now I create a separate comparator DefaultFlagRankingComparator() that can sort Flag by id. How can I sort a list of Country by Flag id, using this DefaultFlagRankingComparator()? 回答1: You can invoke the compare method of the Comparator with the flag field of each country.

问题 I have a sample class, say Country : class Country { public String name; public int population; public Flag flag; ... } I have this Flag class defined somewhere else class Flag { String id; int pixel; ... } Now I create a separate comparator DefaultFlagRankingComparator() that can sort Flag by id. How can I sort a list of Country by Flag id, using this DefaultFlagRankingComparator()? 回答1: You can invoke the compare method of the Comparator with the flag field of each country.

问题 I have a sample class, say Country : class Country { public String name; public int population; public Flag flag; ... } I have this Flag class defined somewhere else class Flag { String id; int pixel; ... } Now I create a separate comparator DefaultFlagRankingComparator() that can sort Flag by id. How can I sort a list of Country by Flag id, using this DefaultFlagRankingComparator()? 回答1: You can invoke the compare method of the Comparator with the flag field of each country.