How to check that the List<Object> exists and contains an object of class whose partnerRole field value is equal to “CREATOR” and companyId field value is equals to “123”? Document class: My method for generating a List of Criteria. But that won’t work because I’m ref…
Tag: java
Change all letters except space from a string using Java
I want to change all letters from a string to “-” char except space using Java. I tried: and They didn’t work. I tried: It worked but i didn’t change Turkish characters I use in that string. Original Code: Answer You can use the \S regex:
Dynamodb get a single item based on sort key only
I am new to dynamodb and I need to process 5M records. Each record has an id and a status. I need to query for each record based on its status, process it, and finally update the status. I am using DynamoDbEnhancedClient but I could not find example on how to query based only on the range and not the
How do I read strings from a file that already contain double quotes?
I have a list of names in a .txt file which are in the format: “Tim”, “Dave”, “Simon” The input will always be single value names in quotes, comma separated and on a single line. I want to read these into String[] names. I have the following code, but the output puts each o…
Doubly Linked List adding null
I’m new to Java. I want to make student information system, but whenever I used the addStudent method, I get a list with null values. This is the student class for getting names telephone numbers and student ID. This is the Node class. Methods can be wrong maybe they are too complicated sorry for that. …
How to split an array of objects in java or Kotlin?
I have already asked one question about this here but, that answers about only strings. I could not edit that as there a couple of answers there already. Now, I get it how to split it with a space as given in that post. But, how can I split it with objects of custom class like this: Now, I want
How to iterate over a Map to obtain a String of repeated Character Keys with Java 8
I have a Map shown below: I need to obtain the output: I can do it in normal process, but I want to do it in Java 8. Can you share some hints how to achieve this? Answer Here’s a couple of ideas on how to approach this problem using Java 8 streams. The overall idea: create a stream of
reduce the internal log level for Log4j2 (with Kafka Appender)
I’m using Log4j2 (v2.17.2) to send information directly to kafka, and am using XML to create the configuration (as many articles mention that XML can handle a lot more configuration options – properties do not). The issue that I have is that my console is filled to the brim with irrelevant INFO lo…
How to solve KeyError: 400 Bad Request
I have a server to which I want to send post requests in the form of json in Java. But after sending, it gives the answer: “KeyError: 400 Bad Request: The browser (or proxy) send a request that this server could not understand.”. No matter how I change the data, it still gives this error, and the …
How to use generics for type safety while using `removeRange` method of ArrayList
Since the method – removeRange(int startIndex, int ) is protected, we need to use it in a class extending ArrayList. Below is my code – Output – Now to use type safety I need to write – MyClass<String> extends ArrayList<String> but doing so gives error in main method of Str…