Is abstraction possible without inheritance? This is my code Please note above, how i: did not extend the class “what” from abstract class “whatever” and yet the code runs perfectly with no errors Did not declare class “what” as abstract (since it’s not declaring the …
Could not exec java with Spring+Maven exit code 1
I am new to Spring/Maven, and am following this tutorial: Serving Web Content with Spring MVC. Everytime I run mvn spring-boot:run, I get this error: Failed to execute goal org.springframework.boot:spring-boot-maven-plugin:1.5.2.RELEASE:run (default-cli) on project gs-serving-web-content: Could not exec java:…
How to check if a string is ‘float’ or ‘int’
I have a string, and I know that it only contains a number. How can I check if this number is int or float? Answer There are many ways to solve your problem. For example, you can use try{}catch(){}: Solution 1 Solution 2 Or you can use regex [-+]?[0-9]*.?[0-9]+: For more details, take a look at Matching Float…
Android DatePicker dialog, date should come from tomorrow
by Using this code, in dialog date is pointed to tomorrow but user can also select todays date.I want user can select date from tomorrow not today. public class CustomDatePickerDialog extends DatePickerDialog { Answer Use instead of
Hiding ‘Bottom Navigation Bar’ whilst keyboard is present – Android
I have a small demo chat UI application. This application has a bottom navigation bar. I need the bottom navigation bar to hide when the keyboard appears. Here is an example of the chat UI As you can see when you click in the EditText element, the keyboard appears but the bottom navigation bar stays visible. …
How to implement video with connectionservice
I want to implement a videochat using the system app via connectionservice. https://developer.android.com/reference/android/telecom/ConnectionService.html. Unfortunately i can not find any example or tutorial how to do it. Here is what i have done: Registering the service: Placing the call: My ConnectionServi…
Java JNA – Base Address Finding
I am currently attempting to read/write to memory through the use of JNA for Java. For the past week I have tried a multitude of solutions, mostly from [similar projects][1] I have found online, but nothing has resolved my problem. I know I am receiving the correct process ID of the program, then I create a P…
Spring Boot application in eclipse, the Tomcat connector configured to listen on port XXXX failed to start
I’m developing a REST API using Spring Framework. First I wasn’t able to run my application because of the same problem. The port 8080 on my computer is busy. Then I found out that one alternative to solve this problem is creating an application.properties file under src/main/resources folder. Tha…
Checking if a double is a power 2
I’m not sure how to check if a double is a power of 2. This is my code so far: double x = Double.longBitsToDouble( Double.doubleToRawLongBits(n) & Double.doubleToRawLongBits(n – 1) ); I used …
java polymorphism aliasing issue
If there’s 3 classes. A, B and C. class B extends A and class C extends B. class A has equals method: class B has equals method: and class C has euals method: And the main has these code lines: I can’t understand why the equals method of class A is being executed. I know that overloaded methods ar…