In a first file I declared the Matrix class with corresponding generic variable and with a constructor defined as follows: And in a second test file class with main program I declare the matrix of generic variables with String elements. Nevertheless I don´t quite understand why I get the error: If I´m using a 2d-dimensional array what´s wrong with the
Tag: class
In Intellij, when I create new package and after right click new -> java class doesn’t show
In new Interface package when I right-click in new java class option nit shown Answer interface is not a valid package name, because it is a Java keyword. A keyword can not be used as an identifier, for example as a package name, variable name or class name. If you choose a different name for your package, the option to
How to use java stream to convert a List of some class to a list/set of any one property of class?
I have a class I have a list of class student say, List<Student> students whose size is 100. I want to stream id of all the students and save it in a set Set<int>id, one easy way to do it is using a for loop, can someone please tell how the same can be implemented using java stream API. Answer
Java OOP; creating array of objects
I’d like to create an array of objects where 3 objects are from one class, and a 4th is from second class. In the first class I did the following: in the second class I did the following: In the main class, I created several pupil objects and one tutor object, like this: Using objects for printing in main works
Is it possible to have values for class object in java, if yes how can we acquire it?
Let’s say, I am initializing a class obj as follows: Is it possible to initialize as such I mean we initialize String and primitive values like that, But I mean for any class. And how can we get them so they can be used in some method of the same class? Answer Yes if it is for built in types
How to use a HashMap returned from a method
Here I have a program which creates a HashMap within a method This program doesn’t work due to the fact that in the main method “abilities” cannot be found. How can I make it so I can use my HashMap in the main function. Answer Try it out
How to create objects for parameterized constructors in Java, when we have two classes with the same attributes?
I have class Student, that has first name, last name and age, and a method to print the name and the age of the student. And I have a second class Professor, that has first name, last name, and university. And I have a method to print the info about the professor. And in the main class I create two
Swapping elements in an array Java
I am working on a classes challenge in school. We have to great a Boat class and Harbor class. I have gotten every test to work except the final test of where boats are parked in the Harbor. The Harbor constructor contains an array for the Harbor. The test we have to run is below and the code I have
Accessible and Modifiable data?
what is the difference between accessible and modifiable data in the variable grade in terms of accessibility from outside the class? This is my code where i’m calling grade method from outside the class: Answer accessible data means you can only access .we can you only view or access the data it can not be modified or changed whereas modifiable
what is “def” in Java class
Currently, I am using RestAssured for API automation in my project. As we know, it is a Java Project. When I look at the code of class named “TestSpecificationImpl” in Rest-Assured API. I can see that, it is using methods like: I heard about the concept of local variable type inference in java. But it is a concept of Java