big java solutions

Given A collection of numbers that might contain duplicates, return all possible unique permutations.For example,[1,1,2]The following unique permutations:[ [1,1,2], [1,2,1], [2,1,1]1 Public classSolution {2listNewArraylist();3 PublicListint[] nums) {4listNewArraylist();5 Boolean[] Visit =New Boolean[nums.length];6 Arrays.sort (nums);7 DFS (list,nums,visit);8 returnans;9 }Ten One Public voidDFS (listint[] Nums,Boolean[] visit) { A if(list.size () = =

While loading persisted sessions [java. io. EOFException] Three solutions !, Dowhilenotrs. eof Cause: (1) IOException while loading persisted sessions: java. io. EOFException when loading persistent session error: the object end is abnormal, that is, it has been read to the end of the file, tomcat still tries to read the content. (2) After modifying the jsp fi

Java report tool FineReport Common Errors and solutions (2), javafinereport I hope that you can solve your own problems and solve them. Mark them to benefit yourself. If any problem occurs, first search for the document, and then check whether du Niang is there, and then check whether there is a forum. If an error is reported, the log must be viewed. Below is a simple list of common problems that are ment

1, Java is a cross-platform, there is a problem in Linux, the main one is the file Read permission; The system environment variable setting under two checks can be!.profile correctlyJavaweb_ Deploy the Javaweb project developed on the Windows platform to the Linux platform steps: 1. On the Windows platform, package the project into a. war file by MyEclipse "file", "Export", 2, On the Windows platform, deleting. jar files in the. war file that are dupl

Java Concurrentmodificationexception Exception Analysis and SolutionsHttp://www.2cto.com/kf/201403/286536.htmlJava.util.ConcurrentModificationException Solutionshttp://blog.csdn.net/lipei1220/article/details/9028669Cause: Iterator do traversal, HashMap is modified (Bb.remove (ele), size-1), Iterator (Object ele=it.next ()) will check HashMap size,size change, Throws an error concurrentmodificationexception.// 1 使用Iterator提供的remove方法，用于删除当前元素for (Itera

[0][i] = = 0 Flag = =true){ -Dp[0][i] = 1; +}Else{ -Flag =false; +Dp[0][i] = 0; A } at } - for(inti = 1; I ){ - for(intj = 1; J ){ - if(Obstaclegrid[i][j] = = 0) -DP[I][J] = Dp[i-1][j] + dp[i][j-1]; - Else inDP[I][J] = 0; - } to } + returnDp[m-1][n-1]; - } the}Optimization for one-dimensional array solution:1 Public classSolution {2 Public intUniquepathswithobstacles (int[] obstaclegr

} - return false; - } the}The solution 3:https://leetcode.com/discuss/110659/o-1-time-c-solution-inspired-by-q_rsqrt the O (1) Solution of the Great God.Solution 4:The total number of squares is a series of odd sum, for example:1 = 14 = 1 + 39 = 1 + 3 + 516 = 1 + 3 + 5 + 725 = 1 + 3 + 5 + 7 + 936 = 1 + 3 + 5 + 7 + 9 + 11....1+3+...+ (2n-1) = (2n-1 + 1)N/2 =n1 Public classSolution {2 Public BooleanIsperfectsquare (intnum) {3 inti = 1;4 while(num > 0) {5

Given a matrix of m x n elements (m rows, n columns), return all elements of the Matri X in Spiral Order.For example,Given the following matrix:[[1, 2, 3], [4, 5, 6], [7, 8, 9]]You should return [1,2,3,6,9,8,7,4,5] .Subscribe to see which companies asked this question1 Public classSolution {2 PublicListint[] matrix) {3listNewArraylist();4 if(Matrix = =NULL|| Matrix.length = = 0 | | Matrix[0].length = = 0)returnans;5 intStartX = 0,starty = 0,endx = Matrix[0].length-1,endy =

JS End:window.open ("Demoexcel.jsp?columnname=" +encodeuri (encodeURI (columnName)) + "columnwidth=" +columnwidth+ " resultsettype= "+resultsettype+" columnsum= "+columnsum+" mainheader= "+encodeURI (EncodeURI ( Mainheader) + "subheader=" +encodeuri (encodeURI (subheader)) + "sql=" +sql+ "bw="Java side:String subheader = Urldecoder.decode (Request.getparameter ("Subheader"), "Utf-8");JS Pass value Java back

{PrivateString encoding=NULL; Public voiddestroy () {} Public voidDoFilter (servletrequest req, Servletresponse resp, filterchain chain)throwsIOException, servletexception {httpservletrequest request=(httpservletrequest) req; HttpServletResponse Response=(HttpServletResponse) resp; request.setcharacterencoding (encoding); Chain.dofilter (Request,response); Response.setcontenttype ("Text/html;charset=utf-8"); } //get initialization parameters in the configuration file Pu

.-------------------------------------------------------------------------------------------Question 4: Crawling Web content sometimes contains the crawled Web site's own JS function, video links and other code, which can be displayed on the browser may prompt JS error solution: Filter out all tags such as script, style, link, and all tag events (such as onclick, onmouseover, etc.) -------------------------------------------------------------------------------------------Issue 5: The genera

Dynamic loading of properties files in Java without the need to restart application solutions In a Java project, if you need to use a file of. Properties type to store the media as some configuration information, the. properties file is usually placed in the SRC directory, and most of the code is written like this: Properties prop = new properties ();InputStrea

Troubleshoot the causes and solutions of Java defunct: In many cases, after we start the Java process, if we exit this Java process, we can still see the process in the system process. This situation generally appears in the Unix/linux system, for the win platform appears less. This process is on the UNIX platform an

value is 64M.The ratio of the-xx:survivorratio:eden area to the Survivor area is set to 8, then the ratio of two survivor to one Eden area is 2:8, and a survivor area represents 1/10 of the entire young generation.-xx:+useparallelgc:f younger generations use concurrent collections, while older generations still use serial collections.-XX:+USEPARNEWGC: Set the young on behalf of the parallel collection, JDK5.0 above, the JVM will be set according to the system configuration itself, there is no n

Given a pattern and a string str , find if str follows the same pattern.Here follow means a full match, such that there was a bijection between a letter in and pattern a non-empty word in str .Examples: pattern = "abba" , str = "dog cat cat dog" should return true. pattern = "abba" , str = "dog cat cat fish" should return FALSE. pattern = "aaaa" , str = "dog cat cat dog" should return FALSE. pattern = "abba" , str = "dog dog dog dog" should return FALSE. Notes:Assume co

Given A string s consists of upper/lower-case alphabets and empty space characters ‘ ‘ , return the length of LA St Word in the string.If the last word does not exist, return 0.Note:a word is defined as A character sequence consists for non-space characters only.For example,Given S = "Hello World" ,Return 5 .Subscribe to see which companies asked this question1 Public classSolution {2 Public intLengthoflastword (String s) {3 if(s = =NULL|| S.length () = = 0)return0;4String A =S.tri

Given A linked list, remove the nth node from the end of the list and return its head.For example, n = 2. After removing the second node from the end, the linked list becomes 1->2->3->5.Note:Given n would always be valid.Try to do the in one pass.Subscribe to see which companies asked this question/*** Definition for singly-linked list. * public class ListNode {* int val; * ListNode Next; * ListNode (int X) {val = x;}}*/ Public classSolution { PublicListNode Removenthfromend (ListNode head,i

Find the total area covered by and rectilinear rectangles in a 2D plane.Each rectangle was defined by its bottom left corner and top right corner as shown in the figure.Assume the total area is never beyond the maximum possible value of int.Credits:Special thanks to @mithmatt for adding this problem, creating the above image and all test cases.Subscribe to see which companies asked this question1 Public classSolution {2 Public intComputearea (intAintBintCintDintEintFintGintH) {3 in

Given a binary tree containing digits from only 0-9 , each root-to-leaf path could represent a number.An example is the Root-to-leaf path 1->2->3 which represents the number 123 .Find The total sum of all root-to-leaf numbers.For example, 1 / 2 3The Root-to-leaf path 1->2 represents the number 12 .The Root-to-leaf path 1->3 represents the number 13 .Return the sum = + = 25 .Subscribe to see which companies asked this question1 /**2 * Definition for a binary tree node.3 * public class Tr

Given an array of integers and a integer K, find out whether there is II distinct indices i and J in the array such that nums[i] = Nums[j] and the difference between I and Jare at most K.Subscribe to see which companies asked this question1 Public classSolution {2 Public BooleanContainsnearbyduplicate (int[] Nums,intk) {3 if(nums.length NULL)return false;4HashmapNewHashmap();5 for(inti = 0;i){6 if(Hm.containskey (Nums[i])) {7 intj =Hm.get (Nums[