[ad_1] try this, String s = “25999993654”; System.out.println(Character.getNumericValue(s.charAt(0)) + Character.getNumericValue(s.charAt(1))); 1 [ad_2] solved Can I product of charAt in Java? [duplicate]
[ad_1] You want to use a data structure to store a sequence of objects. For example, an array could do this: Fruit banana[] = new Fruit[10]; for (int i = 0; i < 10; i++){ banana[i] = new Fruit(); } This creates 10 objects of type Fruit in the banana array, I can access them … Read more
[ad_1] As noted: You are not using threads, so this it not about threads. You don’t “close” threads. Threads are not closable. You do need to close input/output streams … and you are not doing that in all of places you need to in your program. But the modern way to close a stream doesn’t … Read more
[ad_1] The exception originates from my_data.get(position) in your onProgressChanged() listener. This listener is called asynchronously, when progress changes, but it refers to the original position provided, when you perform the onBindViewHolder(). So when at time X you do the onBindViewHolder(), position with value 2 is valid (if there are at least 3 entries in the … Read more
[ad_1] You shouldn’t pass a newFeedReader() to setCellRenderer(); A ListCellRenderer is an object used to paint cells, not to be used as a database kind of object. What you’re going to want to do is, Get all of the statuses at the beginning Pass them as an array to a JList Then create a custom … Read more
[ad_1] public class Test { public static void main(String[] args) { String input = “eye-of-tiger”; String modified = dashToUpperCase(input); System.out.println(modified); } private static String dashToUpperCase(String input) { StringBuilder result = new StringBuilder(); boolean toUpper = false; for (int i = 0; i < input.length(); i++) { char c = input.charAt(i); if (c == ‘-‘) { … Read more
[ad_1] It seems “org/apache/commons/logging/LogFactory” is missed. Have you imported the library? 5 [ad_2] solved java.lang.ClassNotFoundException: org.apache.commons.logging.LogFactory [duplicate]
[ad_1] Your HashMap is hm. Put the values of hm in another HashMap hm2 in which the values of hm are the keys of hm2, and the values of hm2 can be anything (e.g. the object Boolean.TRUE). Then loop through that second HashMap hm2 and print out its keys. Instead of HashMap you can also … Read more
[ad_1] Singleton pattern gives you the control over the number of instances of the singleton class that can be instantiated. It is used numerous use cases. The classic Java singleton looks just as you mentioned with a very important detail – the non public constructor. The fact that the constructor is not public (either protected … Read more
[ad_1] askQuestion(0, null, 0, 0, null, 0); All the parms to the static method askQuestion are null/zero, including “operators”. There’s no way for “operators” to NOT be null when you get to that squirrely assignment to “operatorText”. 10 [ad_2] solved How to fix NullPointerException in Java?
[ad_1] I’m guessing you are talking about this tutorial to configure the sending of mails through Compute Engine (which explains why it works well on your VM instance). That tutorial is for Compute Engine, in the case of App Engine Standard applications, you have the option of using Mail API, however, since Google is no … Read more
[ad_1] So, the first thing you want to decide is which technology you want to choose. If you want to use Java I would recommend building a rest service with spring. Takes about 5 minutes with those two guides: Rest Web Service: https://spring.io/guides/gs/rest-service/ Rest Client: https://spring.io/guides/gs/consuming-rest/ IDE: Springt Tool Suite Just follow the instruction! Your … Read more
[ad_1] Adding my comment as a possible answer, since it might point to the problem. getSQLs() is going through each entry in the jar file, but only returns the result of the last entry. Perhaps the last entry doesn’t contain any sql files? 0 [ad_2] solved static method returns empty hashmap
[ad_1] new Squares22(); This is not the constructor defined by the class, and you’re not using your variables… new Squares22(x,y,length); May be better… 1 [ad_2] solved Big Java Help? Squares and Rectangles [closed]
[ad_1] Use the nio package instead : import java.nio.file.Files; import java.nio.file.Path; import java.nio.file.Paths; Path p = Paths.get(“/tmp/.minecraft”); if(!Files.exists(p)){ Files.createFile(p); } if(Files.exists(p)){ Files.delete(p); } 10 [ad_2] solved Java: Delete a file starting with “.” [duplicate]