A comparison of the Arrays.asList() and List.toArray() methods

Arrays and collections are containers for storing objects, the former being simple in nature and easy to use; the latter being safe in type, powerful in function, and necessarily related to each other. But if you don't pay attention to details, they are easy to tread. Array to Set Note whether views are used to directly return data from a ...

Posted by cosmo7 on Sat, 25 Sep 2021 09:39:31 -0700

ArrayMap and SparseArray -- better Map under Android

Comparison of three containers projectArrayMapSparseArrayHashMapconceptMemory optimized HashMapPerformance optimized ArrayMap with key intAccess O(1) Map with a large amount of memorydata structureTwo arrays: A Hash with Key Another Key and Value are storedTwo arrays: A stored Key Another save ValueArray + linked list / red black treeApplicati ...

Posted by afrim12 on Fri, 17 Sep 2021 22:14:18 -0700

Li kou-5+CCF two questions

Topic 1 thinking Interval DP To play DP, first determine why it is DP, then the old four. First find several States, assign initial values, find transfers, and finally find the answer. Determination algorithm If abba is a palindrome string, bb must be a palindrome string. Therefore, abstract whether abba is a palindrome string and wh ...

Posted by a6000000 on Mon, 13 Sep 2021 12:32:59 -0700

Rust: array, dynamic array, string -- thoroughly combing concepts and methods

Arrays and strings are essentially the same. They all correspond to a continuous piece of memory. In C language, a string is an unsigned char ending in a number zero   Array, that is, Rust's u8 array. C language array is a pointer. As for the size of the array, it is up to the programmer to manage it. The advantage of this is that the gra ...

Posted by storyteller on Thu, 09 Sep 2021 21:25:38 -0700

java base-array (review)

Java Array 1. Definition of arrays An array is an ordered collection of data of the same type Arrays describe several data of the same type, grouped in a sequence Where each data is called an array element, and each array element can be accessed through a subscript 1.1, Array declaration creation Array variables must be declared before ...

Posted by mikerh9 on Sat, 04 Sep 2021 23:38:01 -0700