making comparator java

Objects exist in an array or set, and data in the set needs to be sorted frequently. in Java, the collections and arrays classes encapsulate the sort method to sort an array or set. Based on the preceding conditions, you can configure the comparator method to sort object information according to the conditions you need. The nine basic types of comparator based on

{9 return-1;Ten } One Else if(P1.getprice () >P2.getprice ()) A { - return1; - } the Else - //If the price is the same, sort by ID - { - if(P1.getpid () p2.getpid ()) + { - return-1; + } A Else if(P1.getpid () >p2.getpid ()) at { - return1; - } - Else - { - return0;

,intAgeintgender, String address) { - Super(); $ This. Name =name; $ This. Age =Age ; - This. Gender =gender; - This. Address =address; the } - Wuyi } the - ------------------------------1 ImportJava.util.Comparator;2 3 Public classComparatorimplImplementsComparator{4 5 @Override6 Public intCompare (user O1, user O2) {7 8 if(NULL!=o1 NULL!=O2) {9 if(O1.getage () >O2.getage ()) {Ten return1; On

First, comparator interface inheritance Public classComparatortest {/** * @paramargs*/ Public Static voidMain (string[] args) {//----Write a programListNewArraylist(); for(inti = 10; I ) {List.add (NewStep (i)); } for(inti = 5; I ) {List.add (NewStep (i)); } comparators com=Newcomparators (); Collections.sort (list,com); SYSTEM.OUT.PRINTLN (list); }}classstep{intDatatime; Step (inti) {Datatime=i; } Public intGetdatatime

Java record-61-ComparatorPublic interface Comparator public class TreeSetTest { public static void main(String[] args){ TreeSet tree = new TreeSet(new MyComparator()); tree.add(new Person(24)); tree.add(new Person(33)); tree.add(new Person(21)); tree.add(new Person(20)); System.out.println(tree); //[20, 21, 24, 33] }}class Person{ int age; Stri

)};9Arrays.sort (Dogs,Newdogcomparator ());Ten for(Dog dog:dogs) { One System.out.println (dog); A } - } - the}1 Public classDog {2 PrivateString name;3 Private intAge ;4 PublicDog () {5 Super();6 //TODO auto-generated Constructor stub7 }8 PublicDog (String name,intAge ) {9 Super();Ten This. Name =name; One This. Age =Age ; A } - PublicString GetName () { - returnname; the } - Public

1. Sorting by comparablePackage Comparable;import Java.util.arrays;public class Comparableuser implements comparable2. Sorting by implementing comparatorPackage Comparable;import Java.util.arrays;import java.util.comparator;class User {private String ID; private int age; Public User (String ID, int age) {this.id = ID; This.age = age; } public int Getage () {return age; public void Setage (int.) {this.age = age; } public String GetId () {return id; } publi

(floatYingyu) { This. Yingyu =Yingyu; } PublicStudent (String name,floatYuwen,floatShuxue,floatYingyu) { Super(); This. Name =name; This. Yuwen =Yuwen; This. Shuxue =Shuxue; This. Yingyu =Yingyu; } PublicStudent () {Super(); } @Override PublicString toString () {return"Student [name=" + name + ", yuwen=" + Yuwen + ", shuxue=" + Shuxue + ", yingyu=" + Yingyu + "]"; }}The method of sorting the list collection in Java the use

sorting function has already been implemented in Java APIs. We do not haveWe need to repeat the wheel. The arrays class has a static method sort. With this method, we can import the array we want to sort into the sorting. Because we pass in an array reference, the sorting is complete.The result also uses this reference to change the array. for sorting integers and strings, JDK provides the default implementation. If you want to sort an array of objec

TreeSet guarantees no duplicate data, also guarantees long (n) Time complexity for Add (), remove (), contains ().ImportJava.util.Comparator;ImportJava.util.TreeSet; Public classMYSETWITHCOMPR { Public Static voidMain (String b[]) {TreeSetNewTreesetNewMYCOMPC ()); Ts.add (NewMyComp ("RED", 1)); System.out.println ("Added"); Ts.add (NewMyComp ("ORANGE", 1)); System.out.println ("Added"); Ts.add (NewMyComp ("BLUE", 1)); System.out.println ("Added"); Ts.add (NewMyComp ("GREEN", 1)); System.out.prin

Business requirements:Descending by number of participants, then by rank and ascendingNumber of people: pertotal, ranking of the sum: ranktotalFull code:@Overridepublic jsonobject gettopunitofgameranking (listkey part code (in the same number of cases, compare the sum of the rankings):listExamples of comparator in Java

PackageCom.swift;Importjava.util.ArrayList;Importjava.util.Collections;ImportJava.util.Comparator;Importjava.util.List; Public classMax_substring_test { Public Static voidMain (string[] args) {/** Maximum common substring of several strings*/String str1= "Eriousdfndnfdlk"; String str2= "Dkgfdkgkdjgdjgjksjgksgjsdkjsdierioe"; String STR3= "Ldskfjdskierundsnfjerioejrejrheruer3j43j4hj3"; String Sub; ListNewArraylist(); for(inti = 0; I ) {Sub= str1.substring (0, i); if(Str2.indexof (s

Complete process parsing for JSP + Servlet making Java Web login function, servletjava 0. Create a web ProjectFirst, create a java web project named login in MyEclipse. In this case, the project contains a src folder and a WebRoot folder, a jre library folder and a J2EE library folder that comes with Java Web. Where, u

difference being how to load its configuration.When using an XML file to declare beans, an appropriate application context selection might be classpathxmlapplicationcontext. This spring context implementation loads the spring context from one or more XML files in the application's classpath. Here's a concrete example. public class Knightmain { public static void main (string[] args) throws Exception {Classpathxmlapplicationcontext context = new Classpathxmlapplicationcontext (" meta-

BufferedImage GetImage () {BufferedImage image = CreateImage ();//Create Picture buffergraphics2d g2 = (graphics2d) image.getgraphics ();//Get Drawing environmentStringBuilder sb = new StringBuilder ();//used to load generated captcha textDraw 4 characters into a picturefor (int i = 0; i String s = Randomchar () + "";//random generation of one letterSb.append (s); Add the letters to SBfloat x = i * 1.0F * W/4; Sets the x-axis coordinates of the current characterG2.setfont (Randomfont ()); Set R

merge them together　 Public classBraveknightImplementsKnight {PrivateQuest Quest; PrivateMinstrel Minstrel; Publicbraveknight (Quest Quest, Minstrel Minstrel) { This. Quest =Quest; This. Minstrel =Minstrel; } Public voidEmbarkonquest ()throwsquestexception {minstrel.singbeforequest (); Quest.embark (); Minstrel.singafterquest (); }} It should be able to run, all you have to do is go back to your config file and then declare a minstrel bean and inject it into the Braveknight c

);System.out.println ();PrintWriter Out=null;String msg= "Incorrect input!";try {Resp.setcontenttype ("Text/html;charset=utf-8");Out=resp.getwriter ();if (code2.equals (code)) {msg= "input correct!";}Out.print (msg+ "\tcode=" +code+ "\tcode2=" +code2);} catch (Exception e) {E.printstacktrace ();}finally{if (null!=out) out.close ();}Super.doget (req, resp);}@Overrideprotected void DoPost (HttpServletRequest req, HttpServletResponse resp)Throws Servletexception, IOException {Doget (req, resp);}}(C

(). Getannotation (Table.Class); sql+=Tab.name () +"Set";Get Table name StringWH ="";Record Field name String k=""; Boolean bl=false;Record whether the primary key is emptyfor (FieldFl:fiels) {Cyclic assemblyFl.setaccessible (TRUE);Turn on access to a private variable Object tobj=Fl.Get (obj);if (tobj!=null) {IfFl.isannotationpresent (Key.Class)) {Determine if there is a primary key bl=true; k=Fl.getname () +"= '" +tobj.ToString () +"' Where";}else{if (!Fl.isannotationpresent (Notrecord.Class))

Java.net.SocketInputStream.read (Socketinputstream.java:171)At Java.net.SocketInputStream.read (Socketinputstream.java:141)At Okio. okio$2.read (okio.java:139) at Okio. asynctimeout$2.read (asynctimeout.java:237)... MoreThe problem is that the API has been processed for a long time, and the Okhttpclient client I created didn't give enough time to take care of it, so I needed to set a longer connection and read time to 50 seconds to pass. The code looks like this:New Okhttpclient (). Newbuilder

public static listDecimalFormat df=new DecimalFormat (". xx"), float sumprop=0;for (int i=0;iNote: The subscript for arguments to SQL is starting from 1, and the Java substring method starts with 0Java: Generates a random probability of 2 decimal digits, making the and 1