java

[Solved] Java Creating Objects at Runtime in a For Loop

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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 by … Read more

[Solved] How to close threads in Java? [closed]

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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 involve … Read more

[Solved] I need a way around to tackle the following IndexOutOfBoundsException [closed]

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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 list). … Read more

[Solved] Replace “-” with capital Letters [closed]

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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 == ‘-‘) { toUpper … Read more

[Solved] How to fix NullPointerException in Java?

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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 solved How to fix NullPointerException in Java?

[Solved] Java Google App Engine won’t send email via Mailgun SMTP

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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 longer … Read more

[Solved] Java translator [closed]

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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 task … Read more

[Solved] static method returns empty hashmap

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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 solved static method returns empty hashmap

[Solved] Java: Delete a file starting with “.” [duplicate]

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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 solved Java: Delete a file starting with “.” [duplicate]