Senior Java Developer Interview Questions With Example Answers

Checked exception is checked by the compiler at compile time. It’s mandatory for a method to either handle the checked exception or declare them in their throws clause. These are the ones which are a sub class of Exception but doesn’t descend from RuntimeException. The unchecked exception is the descendant of RuntimeException and not checked by the compiler at compile time. This question is now becoming less popular and you would only find this with interviews with small companies, both investment banks and startups are moved on from this question. Public static final variables are also known as a compile time constant, the public is optional there.

If the main () method is permitted to be non-static, the JVM must instantiate its class when calling the function. The final keyword defines the entity which can be assigned only once and can’t be modified in the future. Once it’s been set, it can’t change its value anymore, for instance in the functions. The entity defined by the final keyword can be a variable, a class, a method, etc. Method overriding in Java stands for a feature that allows a subclass or child class to complete a specific implementation of a method that has been done by one of its superclasses or parent classes. 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. Static methods cannot be overridden because they are not dispatched on the object instance at runtime.

In Java, static as well as private method overriding is possible. Comment on the statement.

A class requesting its dependencies through its function Object() is the most typical instance of dependency injection. Since the client cannot be constructed without the required dependencies, this guarantees that it is always in a correct state. Since this char [] array is used by the Java String class internally, the length variable cannot be made public. Sub-packages won’t be imported when a package is imported.

Servlets destroy methods can be easily overridden to perform cleanup, like when closing a database connection. Hibernate supports JPA annotations, so the code is independent of the implementation and easily replaceable with other ORM tools. JDBC code is very tightly coupled with the application. Hibernate supports lazy initialization using proxy objects and perform actual database queries only when it’s required. Hibernate framework provides support for XML as well as JPA annotations, that makes our code implementation independent. Classes and better to use DAO pattern with dependency injection for the integration.

Define a Java Class.

Whenever you try to update the value of that object instead of updating the values of that particular object, Java creates a new string object. Java String objects are immutable as String objects are generally cached in the String pool. Since String literals are usually shared between multiple clients, action how to become a java developer from one client might affect the rest. It enhances security, caching, synchronization, and performance of the application. In Java, Strings are immutable and are stored in the String pool. What this means is that, once a String is created, it stays in the pool in memory until being garbage collected.

senior java developer interview questions

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