double-brace-initialize

Regex match double curly braces nested

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问题 would regex matches while/loop double curly braces contains double curly braces? <?php $str = '<html lang="{{var doc-lang}}"> <head> <title>{{var doc-title}}</div> </head> <body> <div class="container"> <div class="row" {{while products}}> {{var name}} {{var sku}} {{var barcode}} </div {{while end}}> </div> </body> </html>'; Can we get <div class class="row"', [products], {{var name}}, {{ var sku}} and {{var barcode}} from $str ? I only can think of this Reg \<((.*)\{\{while\s+(.*)\}\}(.*)\{\

Alternative to double brace initialization

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问题 I have a nested collection in the form: HashMap<String, HashMap<String, List<String>>> errorList; Now I initialize it inline using double braces like this errorList.put(tempName, new HashMap<String, List<String>>() {{ put("upl", new ArrayList<String>() {{ add("Y"); add("Upload Success"); }}); }}); This lies in a foreach loop with the value of tempName changing in every iteration. I did this because i couldn't use instances of List<String> or HashMap<String,List<String>> because every time i

Double brace initialization with nested collections

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问题 I know I can declare and initialize a List using double braces: // (1) List<Object> myList = new ArrayList<object>(){{ add("Object1"); add("Object2"); }}; But I want a List of <Map<Object,Object>> : // (2) List<Map<Object,Object>> myList = new ArrayList<Map<Object,Object>>(); How can I use double brace initialization (see (1)) with nested collections? My goal is to declare and initialize the data structure in a single line. Also I would like to know if there are certain drawbacks when using

Meaning of new Class(…){{…}} initialization idiom [duplicate]

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This question already has an answer here: What is Double Brace initialization in Java? 12 answers What does {{ ... }} block mean in the following code? class X { private Y var1; private X() { Z context = new Z(new SystemThreadPool()) {{ var1 = new Y(); }}; } } cletus It's called double curly brace initialization . (EDIT: Link removed, archived here ) It means you're creating an anonymous subclass and the code within the double braces is basically a constructor. It's often used to add contents to collections because Java's syntax for creating what are essentially collection constants is

Meaning of new Class(…){{…}} initialization idiom [duplicate]

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问题 This question already has an answer here: What is Double Brace initialization in Java? 13 answers What does {{ ... }} block mean in the following code? class X { private Y var1; private X() { Z context = new Z(new SystemThreadPool()) {{ var1 = new Y(); }}; } } 回答1: It's called double curly brace initialization. (EDIT: Link removed, archived here) It means you're creating an anonymous subclass and the code within the double braces is basically a constructor. It's often used to add contents to

What is Double Brace initialization in Java?

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问题 What is Double Brace initialization syntax ( {{ ... }} ) in Java? 回答1: Double brace initialisation creates an anonymous class derived from the specified class (the outer braces), and provides an initialiser block within that class (the inner braces). e.g. new ArrayList<Integer>() {{ add(1); add(2); }}; Note that an effect of using this double brace initialisation is that you're creating anonymous inner classes. The created class has an implicit this pointer to the surrounding outer class.