I would like to know why my unmarshalling process cause some troubles:   I save my java object in a xml file. I load my java object from the xml file   Once that's done, strange behaviour occurs in the method of my java object (ClassMain.java).  Indeed the method isLogin() returns false just before it returns true (ClassMain.java. Any ideas?  MainClass  public static void main(String[] args) {     Player p1 = new Player();     p1.setLogin("p1");     p1.setMdp("mdp1");           try {          //Test : verify that player's login is 'p1' (return true)         System.out.println(p1.isLogin("p1"));          marshaling(p1);          Player pfinal =unMarshaling();          //Test : verify that player's login is 'p1' (return False ?why?)         System.out.println(pfinal.isLogin("p1"));      } catch (JAXBException e) {         e.printStackTrace();     } } private static Player unMarshaling() throws JAXBException {     JAXBContext jaxbContext = JAXBContext.newInstance(Player.class);     Unmarshaller jaxbUnmarshaller = jaxbContext.createUnmarshaller();     Player player = (Player) jaxbUnmarshaller.unmarshal( new File("C:/Users/Public/player.xml") );     return player; }    private static void marshaling(Object o) throws JAXBException {     JAXBContext jaxbContext = JAXBContext.newInstance(Player.class);     Marshaller jaxbMarshaller = jaxbContext.createMarshaller();     jaxbMarshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);     jaxbMarshaller.marshal(o, new File("C:/Users/Public/player.xml")); }}   Player Class  @XmlRootElement(name = "joueur") @XmlAccessorType (XmlAccessType.FIELD) public class Player{  @XmlAttribute private String login;  public Player() { } public String getLogin() {     return this.login; } public void setLogin(String login) {     this.login = login; }  public boolean isLogin(String n){     if(this.login == n)         return true;     else          return false; } }
I've been using the == operator in my program to compare all my strings so far. However, I ran into a bug, changed one of them into .equals() instead, and it fixed the bug.  Is == bad? When should it and should it not be used? What's the difference?
How much did the Trade Federation know about their 'lord' at time of blockade? Reclassifying only part of raster keeping rest unchanged? I'm trying to reclassify only a certain part of a raster...not the entire raster.  Here's the problem.  I have a LULC raster of the entire US.  There are some issues with the raster that I want to fix, namely some cells that should be water are classified as wetlands.  These are mainly off the coast, not inland.  However, some cells that are classified as wetlands should really be wetlands (mainly inland) and I don't want these to change.  I plan on using a ZIP Code boundary file to determine which cells are considered "off the coast" and which ones are not.  I have access to ArcGIS 10.1 and R with the appropriate raster packages I need so a solution in either software would be fine.  Can anyone help me figure this out? I am generating a fairly large index of .txt, .tex, and .pdf files. This process has worked for a long time, and the size of the index is not the issue. I have added logic to insert additional links in the index and now am running into:  TeX capacity exceeded, sorry [save size=80000]  Questions:  What are the typical causes of this kind of problem, and any suggestions on how to determine the cause of this. Can the save size be increased?  Of course any solution that just allows me to increase the save size would be preferable if it works, the first question is only important if the size can't be increased or I run into this problem again. Notes:  Generating smaller indices seems to work just fine, only when I attempt to generate the entire index do I run into problems, so coming up with a MWE will be difficult. How do I remove 'Places' entries from the Nautilus sidebar? Is there a number whose absolute value is negative? Which word to use when we ask for help?  Some conditions:     We know that the person asked is able to do it. We don't know if the person asked is able to do it. Tricks for getting lots of arrows? Any tips or tricks for getting arrows (besides cheating)? Or tricks for finding a skeleton spawn?  I've tried farming chickens and gravel for feathers and flint, but it takes a ridiculously long time. How do people get enough arrows to make using a bow actually feasible? How to mitigate the Spectre and Meltdown vulnerabilities on Linux systems? How to tell Max CP? List or IList Why are the shebang parts of the following elementary scripts not working:  $ cat hello.sh #! /bin/sh echo Hello $ ./hello.sh bash: ./hello.sh: /bin/sh^M: bad interpreter: No such file or directory  $ cat hello.py #! /usr/bin/env python3 print("Hello") $ ./hello.py : No such file or directory   whereas calling the interpreter manually is working:  $ sh hello.sh Hello $ python3 hello.py Hello It is will known that increasing cooling of a metal casting will lead to finer micro-structure which mean higher mechanical properties. If I have 2 molds one is thick copper die ,&amp; second is just thin-walled copper cup or mold cooled by water. which one of them excepted to cool the molten metal i.e. aluminium faster ?   by calculation it seems that copper die have higher cooling power as it has higher thermal diffusivity , but in real life it seems water have more cooling power. I am so confused. I am making an Android game that is only in portrait screen orientation.  It works great when I run it on my phone, but when I run it on a tablet, even though the screen size is bigger, all of the bitmaps are the same size. Is there any way to make the bitmaps stay the same proportion even on different size screens? Cleaning Contaminated Disc Rotors I've had an eternal struggle with my current bike over brake contamination. The levers and calipers are shimano ultegra r8000, so the latest and (almost) greatest.  I first noticed it when I took it to a repair shop (i no longer use) for a bleed, it came back and the front brake would squeal like crazy and at low speeds had little to no braking force. You can stop from speed but then struggle to come to a halt without using your foot.  At around 2000 miles I tried to replace the brake pads, when I took them out they were black with grime on both sets (front &amp; back), not to mention worn down to the metal. I replaced them with the L04C sintered pads, gave the callipers a good cleaning with a towel (no chemicals) and fitted the new set.  Annoyingly all of my braking issues are back, now I probably should have cleaned the rotors, I simply used some muc off disc brake cleaner on them. I would like to know the best way to clean the rotors, I've inspected the pads and they are looking fairly black now, with plenty of tread left. I'm going to abandon these pads and fit a new set. For the rotors I plan to completely remove them from the wheels (they are center lock fitted) and try and treat them off the bike, what is the best way to fully clean them? They have plenty of wear left in them but you can see these black grooves in them, and plenty of muck on the back that I struggle to get off.  Below are images of the rotors after soaking them in disc brake cleaners, waiting and then wiping them down with a clean, microfiber towel.   Front Wheel Outside Rotor   Front Wheel Inside Rotor - note the increased dirt on this side  Looking at ways people clean their disc rotors, I've seen plenty of suggestions that I would need to burn the contaminants off the discs. Would the best approach be to remove them and use a blowtorch, should I soak them in some nasty chemicals overnight before I try to heat them? Do I try baking them in the oven?  And finally, what is the best way to prevent the brakes from becoming contaminated in the future? it's really off putting when they squeal and don't perform how I'd expect because it means I'm more reserved whilst out riding on the bike, leading to reduced time riding around outside. I commute on this bike (50 miles a week) and then ride about 50 on the weekends also, so it see's it's fair share of road use. I tend to wash it once after my big ride on saturdays and will rinse it off if it's been raining, any day that occurs (since I live in north east england, the acid rain..). I've owned disc brake bikes before and never had half the issues I've had with this, I had a cheap trek with tektro brakes and the brakes were sharper and never had any issues with contamination whatsoever (i did around 500 miles on that bike before a motorist happened).  Thanks for any and all advice :) Can FFMPEG extract images from a video with timestamps? Based on , I figured that there might be multiple questions for distinct locales. Why do the most common transactions to or from bank accounts in the US require waiting one or more days before they are completed? In the information age, it seems like we should be able to transfer money instantly (or nearly so). Examples of a non-commutative division ring No Indian (and Bengali) keyboard layout in Ubuntu 17.04? I've upgraded from Ubuntu 16.10 to 17.04 today. I'm from Bangladesh, and Bengali is my native language. There was an option to set keyboard layout to Bengali in all previous Ubuntu versions I've used. But there's no such option in 17.04, strangely. I can use Bengali by installing the package ibus-m17n,  so I thought maybe there was some problem during my upgrade. But then I checked my friend's PC which runs ubuntu 16.10 and found that ibus-m17n was not installed in 16.10 but there's option for Bengali keyboard layout. So is Bengali keyboard support really removed from 17.04, or was there a problem during my upgrade? Learning ArcPy? Where can I start to learn ArcPy? Layout selector missing