I’m still new to Android Studio, and for practice I want to make a simple To-Do list app. I’m troubles with creating a new TextView and displaying it. I know that I probably need to manually insert the TextView into the layout, but I have no idea how to do that. Here’s my MainActivity code: I am using ConstraintLayout for
Tag: java
Evaluation order of Java operators && vs ||
I have this simple code block When I run this, the console is This result tell me that only a++ == 10 is evaluated. As I read from this https://docs.oracle.com/javase/tutorial/java/nutsandbolts/operators.html, operator && have higher priority than || and should be evaluated first. In this book OCA Java SE 8 Programmer I Certification Guide, at twist 2.4, a similar example give
remove or not return BufferedOutputStream file in java
i would like not to download the BufferedOutputStream when return java method. my code: my problem is when the invoices has Number it generates invoice and download in compressed zip file. but when it has no Number i dont want to download zip. but still zip file downloads but with empty no file in it. if no pdf generated i
How to Convert Point2D.Double’s to use aritmetic operator >
I have this code: What I wanted to do is use the > arithmetic operation in Point2D.Double object. But as the following error says I cannot use arithmetic operators in Point2D.Double elements. How can I modify my code to work with > operator and other aritmetic operators without changing the input elements of the function getMedianX? Answer The error is
The following error java.lang.NullPointerException is displayed after run the project
Problem: My classes are Hooks for setup and test. I try to click on cookie pop-up, using WebdriverWait, but don’t work. I have no idea why. I am a beginner with selenium and automation testing and I am writing a selenium script using java, TestNG, and maven. When I write everything in one class, all works fine, but I want
Fetching to substring before operator from a dynamic string
I have a string like “name = mita and salary> 10000” . Out of which I need to get only name and salary attribute.I am going to have dynamic string on which i need the attribute before operator only. Like here I need to fetch name and salary attribute which r before = and > operator. I can have multiple
How can I open a file in java without its contents been removed?
I want my program to create a file for the user (just for the first time) and write some information to it (it’s not just a line and also can be adjusted anytime later). So I did this: It works but there some problems: When the file gets opened later, as default, the File class removes its contents. When the
Smali – lots of “move-object”
I’m using mt manager to edit Smali in dex. I found that there are many move-object in some classes, most of them are unnecessary. Does it impact performance? Answer Does it impact performance? No. The optimizer should eliminate any unnecessary moves when the smali code1 is compiled to native code. For what it is worth, this is similar to the
What happens at runtime when we have multiple Java threads?
I am trying to understand what happens when you have multiple thread objects and you call start on them. To this end, I have written the following code: So the output I get involves Thread-x, where x is from 0 to 99, but they are in different order than the natural order (i.e. 0,1,2,3,…). I expected this because I read
VSCode Maven “X.java is not on the classpath of project Y”
Currently I have an issue with Maven is Visual Studio Code where it reports errors related to the classpath. The project structure is as following: And the pom.xml of project has: This POM only serves as ‘dummy’ in order to compile each sub project And in the pom.xml of each subproject has the following: When going to any Java source