Java is a widely used programming language that enables developers to create software applications. In this article, we will be looking at some common coding questions in Java and how to answer them. So if you’re looking to improve your coding skills, be sure to read on!
What is an enum?
An enum is a data structure that stores a collection of named values. Enums can be used to represent different types of data, such as colors, strings, or numbers. You create an enum by creating a class that extends the java.lang.Enum class. You then define the fields in the class and give them unique names. In addition, you define a public constructor that takes an integer value as its only parameter. The enum’s values are stored in the fields in the class. To use the enum, you simply call one of the defined methods on the class.
How would you create a switch statement in Java?
A switch statement is a code block that allows you to choose one of several code blocks based on a certain condition. To create a switch statement in Java, you would first need to create an instance of the Switch class. Next, you would need to create an instance of the Case class, and then you would use the Switch instance to create an array of Case instances. Within each Case instance, you would need to create two code blocks: one for the case when the condition is true, and one for the case when the condition is false. Finally, you would use the Switch instance to bind these two code blocks together into a single block.
How would you write a for loop in Java?
In Java, a for loop is used to repeat a set of statements a fixed number of times. The syntax for a for loop is as follows:
for(initialization; condition; increment) { // statements }
The initialization section sets up the loop and determines how many times it will run. The condition section checks to see if the conditions have been met and, if so, executes the statements in the loop. The increment section is used to increase or decrease the number of times the loop runs.
What is the difference between a public and private field in Java?
A public field is accessible by any code that refers to the field, while a private field is accessible only by the class in which it is defined.
What would be the consequences of overriding a getter or setter method in Java?
The consequences of overriding a getter or setter method in Java depend on the type of the object being overridden. If the object is a primitive type, then the method will simply not be called. If the object is an instance of a class, then overriding the getter or setter will change the behaviour of that method relative to other instances of that class. For example, if one instance of a class overrides a getter to return a different value than another instance, then both instances of the class will return the new value. Overriding a setter will have no such affect – setting a value in an overridden setter will just override the default value for that field in all other instances of that class.