Top 50 Java


In case the no value has been assigned to the final variable then using only the class constructor a value can be assigned to it. Object-oriented programming or popularly known as OOPs is a programming model or approach where the programs are organized around objects rather than logic and functions. In other words, OOP mainly focuses on the objects that are required to be manipulated instead of logic. This approach is ideal for the programs large and complex codes and needs to be actively updated or maintained. Synchronization helps to execute threads one after another. It creates two objects and both the objects are ineligible for garbage collection. An empty interface i.e interface without methods and fields is called a marker interface in java.

How should I prepare for a Java interview?

You should prepare for a Java interview by learning both the theory and practicing coding. There are several related questions above.

Thus, this variable can be used only within the scope of a block. The best benefit of having a local variable is that other methods in the class won’t be even aware of that variable. Stack memory only contains local primitive and reference variables to objects in heap space. When we create a string using new(), a new object is created.

What if I write static public void instead of public static void?

The detailed answer to the difference between fail-fast and fail-safe can be found here. The detailed answer to the difference between LinkedList and ArrayList can be found here. The detailed answer to the difference between Array and ArrayList can be found here. Feel free to comment, ask questions if you have any doubt.

The best way to get ready for an interview and to identify a talented developer as an employer is to understand what the role and main functions will be. As remote tech recruiters, we have interviewed Java developers for more than a decade. In this article, you’ll learn the key interview questions to ask an entry-level and/or senior Java developer. Ihor Shcherbinin, our Director of Recruitment put together a list of key questions that will guide you in your interview process, either you are an employer or a job seeker. One of the benefits of this method is that it assists in defining a specific class type behavior so that a subclass can use a parent class method based on its type. The static keyword in java is used for memory management mainly.

Q Can main() method in Java can return any data?

There are two types of platforms, software-based and hardware-based. This code results in an infinite loop if the flag is true and the program exists if the flag is false. A thread is the smallest piece of programmed instructions which can be executed independently how to become a java developer by a scheduler. In Java, all the programs will have at least one thread which is known as the main thread. This main thread is created by the JVM when the program starts its execution. The main thread is used to invoke the main() of the program.

java developer interview questions

When the other thread has finished, the waiting thread again comes into the running state. Within the run() method, you must specify the thread’s code. Unchecked exceptions are not checked at compile-time. While exceptions are conditions that occur because of bad input or human error etc. e.g. FileNotFoundException will be thrown if the specified file does not exist. Or a NullPointerException will take place if you try using a null reference. In most of the cases it is possible to recover from an exception (probably by giving the user feedback for entering proper values etc.