LxLxBlog

How to use a common library for multiple Java Web projects

I have four different projects and I am using Weblogic to deploy my project Several libraries (JAR files) are common t……

Java

2020-03-09

Java – stream and parallelstream

I have a test code like this: List<Integer> list = new ArrayList<>(1000000); for(int i=0;i<1000000;i++……

Java

2020-03-09

Why are Java generic type parameters not implemented at run time?

My understanding is that C # and Java differ in some aspects in terms of generics. One of them is that generic type pa……

Java

2020-03-09

How do I get string values from ArrayList and store them in a comma separated single string in Java 8?

I have an ArrayList with some strings I want to store the list of numbers in ArrayList in a single string separated by……

Java

2020-03-09

How to get the logical part of a sentence in Java?

Suppose there is a sentence: On March 1,he was born. Change it to He was born on March 1. Without breaking the meaning……

Java

2020-03-09

Java – how to set a custom object in the JTable line

I should first tell it that this is not about rendering table cells This is the tablemodel I'm building using a 2D arr……

Java

2020-03-09

Convert int to object in Java

I have a problem: I work in an eclipse environment Sometimes the computer does not give the following conversion: int ……

Java

2020-03-09

Java – how does this cause deadlocks?

I was brushing my java and was asked this question in the exercise How can the following cause deadlock? private Objec……

Java

2020-03-09

Java – how to iterate over lists such as list >

I have a method to return list < map < string, Object > > How to iterate like list < map < string, O……

Java

2020-03-09

Java – the target fragment declared by the fragment does not belong to this fragmentmanager

I did an activity a, in which there is a fragment X. through fragment x, edit and click the text item on the event. I ……

Java

2020-03-09

Is there something similar to the spring @ transactional annotation available in Java EE 6?

In my company, I do not encourage the use of spring framework, but promote Java EE 6 But recently I read about the spr……

Java

2020-03-09

Java – why is it faster to iterate buckets in linked HashMap than HashMap?

It's hard for me to understand that Google search, I found and If this is the case, why does the only HashMap have to ……

Java

2020-03-09

Java – why can variables be declared without an initial value?

I'm reading Gilles Dowek's programming principles: He said that it is also possible to declare a variable without givi……

Java

2020-03-09

Java – pass an argument instead of returning it from a function

It is clear from the title which method should we adopt? The intent is to pass some method parameters and get the outp……

Java

2020-03-09

A complete switch of enumeration in Java will result in a “missing return statement” error

Suppose we have a switch statement, which completely covers all possible cases of enumeration parameters, and also car……

Java

2020-03-09

Java – add external in eclipse Jar file

I'm adding a download for a java project There was a problem with the jar file This is really my first time using ecli……

Java

2020-03-09

Java HTTP post request UTF-8

My J2EE application can receive post requests from JSP pages, no problem But if I send a post request using another Ja……

Java

2020-03-09

Java – how to reference / handle “this” before the constructor ends?

I think the specific usage of this problem is as follows, but it is more common I have a custom JFrame class, which ca……

Java

2020-03-09