Set Date in a single line
Set Date in a single line
java
java.lang.IllegalThreadStateException
You are storing the thread in a field. If the method is called in two threads, the readThread.start() can be called twice for the same thread. You need to ensure readCommand is not called multiple times and perhaps not start the readThread again if its already running. e.g. you can synchronized the method and check readThread before … Read more
What is an method in Java? Can it be overridden?
Have a look at the Java Virtual Machine Specification, chapter 2.9. It say on the <init> name: At the level of the Java Virtual Machine, every constructor written in the Java programming language (JLS §8.8) appears as an instance initialization method that has the special name <init>. This name is supplied by a compiler. Because … Read more
fixing errors on a program to call methods in java
Try this: (not sure how many changes you have already made) public class Oops3 { public static void printer(double x, double y) { System.out.println(“x = ” + x + ” and y = ” + y); System.out.println(“The value from main is: ” + y);} public static void main(String[] args) { int z = 5; double … Read more
Selenium using Java – The path to the driver executable must be set by the webdriver.gecko.driver system property
The Selenium client bindings will try to locate the geckodriver executable from the system PATH. You will need to add the directory containing the executable to the system path. On Unix systems you can do the following to append it to your system’s search path, if you’re using a bash-compatible shell: export PATH=$PATH:/path/to/geckodriver On Windows … Read more
Using JavaFX in JRE 8, “Access restriction” error
From the Eclipse Point of view the error is totally correct because JavaFX is coming from the extension classpath and is not available on ALL Java8 VMs (e.g. ibm!). As outlined you can suppress those warnings by add access-rules or IMHO the best solution is to install e(fx)clipse which does this automatically for you and … Read more
How do I initialize a byte array in Java?
You can use an utility function to convert from the familiar hexa string to a byte[]. When used to define a final static constant, the performance cost is irrelevant. Since Java 17 There’s now java.util.HexFormat which lets you do byte[] CDRIVES = HexFormat.of().parseHex(“e04fd020ea3a6910a2d808002b30309d”); This utility class lets you specify a format which is handy if you find other formats easier … Read more
How do I replace a character in a string in Java?
I’m trying to replace a character at a specific index in a string. What I’m doing is: String myName = “domanokz”; myName.charAt(4) = ‘x’; This gives an error. Is there any method to do this? Best Answer String are immutable in Java. You can’t change them. You need to create a new string with the … Read more
String is immutable. What exactly is the meaning?
Before proceeding further with the fuss of immutability, let’s just take a look into the String class and its functionality a little before coming to any conclusion. This is how String works: [java]String str = "knowledge";[/java] This, as usual, creates a string containing “knowledge” and assigns it a reference str. Simple enough? Lets perform some more functions: [java] String s = str; // … Read more
How can I design a class named allergy
requirement: design a class named allergy that provides information about the allergy of a patient. e.g. who reported the allergy(patient/doctor/relative), different symptoms of the allergy that are detected, severity, method that returns when was that allergy detected in that patient. I am thinking of something like this: [java]public abstract class Allergy{ private String reporter; private … Read more
