runnable

问题 My question is related to this question, which already has an answer: yes, there is a happens-before relationship imposed between actions of the thread calling invokeLater / invokeAndWait and actions on the EDT of the runnable thereby submitted. My question is a bit more general: Is it even possible to implement a method, such as invokeAndWait , such that it works properly , but not imposing a happens-before relationship? By the method working properly I mean the following: The submitted

问题 My question is related to this question, which already has an answer: yes, there is a happens-before relationship imposed between actions of the thread calling invokeLater / invokeAndWait and actions on the EDT of the runnable thereby submitted. My question is a bit more general: Is it even possible to implement a method, such as invokeAndWait , such that it works properly , but not imposing a happens-before relationship? By the method working properly I mean the following: The submitted

问题 My question is related to this question, which already has an answer: yes, there is a happens-before relationship imposed between actions of the thread calling invokeLater / invokeAndWait and actions on the EDT of the runnable thereby submitted. My question is a bit more general: Is it even possible to implement a method, such as invokeAndWait , such that it works properly , but not imposing a happens-before relationship? By the method working properly I mean the following: The submitted

问题 I'm looking to get a result from a method which can take a while to complete and doesn't actually return the object, so I'd like to deal with it as effectively as possible. Here's an example of what I'm trying to achieve: public static void main (String[] args) { Object obj = someMethod(); System.out.println("The object is" + obj + ", wooh!"); } public void callObject() { // Sends request for the object } public void receiveObject(Object object) { // Received the object } public Object

问题 I've gone through stackoverflow and all the similar answers - but have found them not of use. Can anyone please point out why this is not working? It should be simple: update the image every 6 seconds (will be every 3 mins but for testing I've put it as 6 seconds). What the code does is - goes through each of the 4 images step by step but does not change the image. HOWEVER when it gets to the last image - it does change it(??). Questions: What's wrong with this? Why would it only update the

问题 I have a runnable inside a fragment. The runnable is meant to update the textviews as well as receive input using buttons. But the program does not enter even once inside the runnable. Please help. What am I doing wrong. Thanks. The code is as follows. I have buttons and textviews inside the runnable. public class TodayFragment extends Fragment { //initialisations @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { //UI initialisations

问题 Till now I manage to find all answers I need but this one confusing me. Let's say we have example code: public class Animal { private String species; private boolean canHop; private boolean canSwim; public Animal(String speciesName, boolean hopper, boolean swimmer) { species = speciesName; canHop = hopper; canSwim = swimmer; } public boolean canHop() { return canHop; } public boolean canSwim() { return canSwim; } public String toString() { return species; } } public interface CheckAnimal {

问题 Till now I manage to find all answers I need but this one confusing me. Let's say we have example code: public class Animal { private String species; private boolean canHop; private boolean canSwim; public Animal(String speciesName, boolean hopper, boolean swimmer) { species = speciesName; canHop = hopper; canSwim = swimmer; } public boolean canHop() { return canHop; } public boolean canSwim() { return canSwim; } public String toString() { return species; } } public interface CheckAnimal {

问题 After learning java on my own, i began a project for getting data from a website through api calls for a game called torn. There were a few little details i fixed thanks to some help, but the main issue i had is still not solved. after a day and a half of running, the program just freezes. i couldn't find anything about it so far. I took heap dumps for a while and i noticed some things. hope someone can help. During the first day or so, all is well (screenshot of heap dump after 3 hours and

问题 I hava a problem about Java 8 Runnable . public static void main(String[] args) { Runnable r1 = Test::t1; Runnable r2 = Test::t2; Runnable r3 = Test::t3; } public static void t1() { } public static String t2() { return "abc"; } public static String t3(String t) { return t; } As the code show, I understand r1 is right and r3 is wrong, but I don't understand why r2 is also right. Can anybody help me understand it? 回答1: r2 is fine due to section 15.13.2 of the JLS, which includes: A method