Java服務端限制下載速度

標籤:java   限速   儲存   沒有資源取之不盡用之不竭。伺服器頻寬有限,能限制一點算一點。最近在使用雲端儲存openstack swift做檔案儲存體下載。如題先上限速code:private Long writeResponse(HttpServletResponse response,InputStream stream, Long speed, Long startTime,

Java學習篇之---Collection介面

標籤:javaCollection介面Collection是最基本的集合介面,一個Collection代表一組Object,即Collection的元素(Elements)。一些Collection允許相同的元素而另一些不行。一些能排序而另一些不行。JavaSDK不提供直接繼承自Collection的類,Java

Java's Volatile Keyword

標籤:轉自http://tutorials.jenkov.com/java-concurrency/volatile.htmlThe Java volatile keyword is used to mark a Java variable as "being stored in main memory". More precisely that means, that every read of a volatile variable will be read from

Java for LeetCode 172 Factorial Trailing Zeroes

標籤:Given an integer n, return the number of trailing zeroes in n!.Note: Your solution should be in logarithmic time complexity.解題思路:計算n能達到的5的最大次冪,算出在這種情況下能提供的5的個數,然後減去之後遞迴即可,JAVA實現如下:static public int trailingZeroes(int n) {if(n<25)return

JAVA的三大特徵 封裝繼承多態- 簡單總結

標籤:簡單總結一下封裝-即從很多類的抽取相同的代碼 寫在一個類裡。好處是 代碼的重用,安全。繼承-減少代碼的書寫。其好處也是 代碼的重用。多態- 把不同的子類對象都當作父類來看,可以屏蔽不同子類對象之間的差異,寫出通用的代碼,做出通用的編程,以適應需求的不斷變化。總的來說還是介面的重用。 那麼總結一下,JAVA的三大特徵 其好處

Java中的中間緩衝變數機制

標籤:上代碼:public static void main(String[] args) {int j = 0;for (int i = 0; i < 100; i++) {j = j++;System.out.println(j);}System.out.println(j);}如果按照Cpp的理解,這個結果應該就是100。不過java,是0。是因為java中有關自增自減操作執行的,java會通過分配臨時變數來執行的。如:j = j++, 是這麼執行的:int temp = j ;j

Java for LeetCode 169 Majority Element

標籤:Given an array of size n, find the majority element. The majority element is the element that appears more than ⌊ n/2 ⌋ times.You may assume that the array is non-empty and the majority element always exist in the array.解題思路:編程之美P130

Java記憶體模型與線程

標籤:   工作記憶體與主記憶體   Java記憶體模型(jmm)的出現是為了各種作業系統和硬體的記憶體訪問的差異。 Java記憶體模型規定了變數(不含局部變數,因為局部變數線程私人,不存在共用問題)都得存放在主記憶體中,而每個線程對這些變數的操作都必須是從主記憶體中取出來並在工作記憶體中完成(如讀取、寫入的操作),不同線程之間不能訪問對方的工作記憶體。如,展現了線程、主記憶體、工作記憶體之間的互動關係:

java程式員應該熟練掌握的技術

標籤:1. JSON資料的讀寫,以及字串,JAVA對象互轉常用的JSON庫,:gson, json,利用JSON構造,樹結構等等,應用2. xml, properties 配置的讀寫解析,properties檔案的解析,可以使用 java.util.Properties 來讀寫xml檔案的解析,DOM,SAX,方式解析,常用的庫 dom4j, jdomapache digester: 這個庫可以將 xml 檔案 轉換成

Java for LeetCode 166 Fraction to Recurring Decimal

標籤:Given two integers representing the numerator and denominator of a fraction, return the fraction in string format.If the fractional part is repeating, enclose the repeating part in parentheses.For example,    Given numerator = 1,

Java for LeetCode 165 Compare Version Numbers

標籤:Compare two version numbers version1 and version2.If version1 > version2 return 1, if version1 < version2 return -1, otherwise return 0.You may assume that the version strings are non-empty and contain only digits and the . character.The .

[LeetCode-JAVA] Substring with Concatenation of All Words

標籤:題目:You are given a string, s, and a list of words, words, that are all of the same length. Find all starting indices of substring(s) in s that is a concatenation of each word in wordsexactly once and without any

Java之俄羅斯方塊(屌爆了版)

標籤:java   swing   俄羅斯方塊   算是終極版俄羅斯方塊吧,方塊顏色,聲音、幻影、消行動畫、方塊生長、方塊下移加、積分、下個方塊,都有。代碼不多,為了方便直接copy能運行,所以全部放在一個類檔案裡了,所有程式碼封裝括大量注釋(我喜歡寫注釋,不寫注釋我自己也會忘了那是個啥)和空格(我喜歡敲空格,代碼太密了不好看)也就2000行左右,代碼編寫得相當優美漂亮,結構清晰

Java for LeetCode 163 Maximum Gap

標籤:Given an unsorted array, find the maximum difference between the successive elements in its sorted form.Try to solve it in linear time/space.Return 0 if the array contains less than 2 elements.You may assume all elements in the array are

java基礎(十)--- 異常

標籤:異常分類圖解:Throwable|--Error嚴重問題,我們不處理。|--Exception  |--RuntimeException運行期異常,我們需要修正代碼  |--非RuntimeException

Java自注三進入

標籤:      由於近期學的內容實際操作比較多,所以新的筆記就用代碼為主體吧!      本回主要內容是輸入,Java中主要用Scanner類和BufferedReader。整體來說不難,但有些細節能夠總結,看代碼:import java.io.*;import java.util.Scanner;public class ioTest{public static void

JAVA學習JSTL與EL

標籤:一、基礎1、EL(Expression Language):為了使jsp寫起來更加簡單,提供了在Jsp中簡化運算式的方法2、JSTL:(JSP Standard Tag

Java for LeetCode 155 Min Stack

標籤:Design a stack that supports push, pop, top, and retrieving the minimum element in constant time.    push(x) -- Push element x onto stack.    pop() -- Removes the element on top of the stack.    top() -

Java for LeetCode 160 Intersection of Two Linked Lists

標籤:Write a program to find the node at which the intersection of two singly linked lists begins. For example, the following two linked lists: A: a1 → a2 c1 → c2 → c3

Java for LeetCode 162 Find Peak Element

標籤:A peak element is an element that is greater than its neighbors.Given an input array where num[i] ≠ num[i+1], find a peak element and return its index.The array may contain multiple peaks, in that case return the index to any one of the peaks

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