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. An infinite loop is an instruction sequence in Java that loops endlessly when a functional exit isn’t met. This type of loop can be the result of a programming error or may also be a deliberate action based on the application behavior. An infinite loop will terminate automatically once the application exits.

Since generics type information gets erased at compile time by Type Erasure, the array store check would have been passed where it should have failed. Method overriding, also known as run time polymorphism is one where the child class contains the same method as the parent class. For instance, we have a method named ‘gfg()’ in the parent class. Thus when gfg() is called in the subclass, the method within the class id executed. Here, gfg() within the class overridden the method outside.

Explain static block

Statement executeQuery(String query) is used to execute Select queries and returns the ResultSet. ResultSet returned is never null even if there are no records matching the query. Statement execute(String query) is used to execute any SQL query and it returns TRUE if the result is an ResultSet such as running Select queries. The output is FALSE when there is no ResultSet object such as running Insert or Update queries.

When an error occurs it is caught at Runtime of the program. Yes in Java we can overload the main method to call the main method with the help of its predefined calling method. Aggregation is a term related to the relationship between two classes best described as a “has-a” relationship. It is a unidirectional association means it is a one-way relationship. Both abstract and non-abstract methods may be found in an abstract class. Both int array[] and int[] array are used to declare an array of integers in java.

Why are generics used in Java Programming?

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 from one client might affect the rest. It enhances security, caching, synchronization, and performance of the application. It is a program that helps in converting the Java bytecode into instructions that are sent directly to the processor. By default, the JIT compiler is enabled in Java and is activated whenever a Java method is invoked.

If you create a similar method in a child class with the same return type and method arguments, it will hide the super class method; this is known as method hiding. Similarly, you cannot override a private method in a subclass because it is not accessible from that. The main function is called by the JVM even before the objects are created, thus even if the code correctly compiles, there will still be an error at runtime. On Heap memory, garbage collection is employed to release the memory used by objects with no references. Every object created in the Heap space has access to the entire application and may be referred to from anywhere. Java’s main() function is static by default, allowing the compiler to call it either before or after creating a class object.

Problem-Solving Skills

In case you try to create a new string object, JVM first checks for the presence of the object in the pool. If available, the same object reference is shared with the variable, else a new object is created. If a subclass provides a specific implementation of a method that is already provided by its parent class, it is known as Method Overriding. It is used for runtime polymorphism and to implement the interface methods. The methods or variables defined as static are shared among all the objects of the class. The static variables are stored in the class area, and we do not need to create the object to access such variables.

• Java 8 is a programming language release that brought significant improvements and new features to the Java platform.
• Since the technical interview is essential in the entire hiring process, we prepared a few Java developer interview questions.
• An ability to recreate an object entirely similar to an existing object is known as Object Cloning in Java.
• Once the method has been compiled, the JVM summons the compiled code of that method directly rather than interpreting it.
• The super keyword in Java is a reference variable that is used to refer to the immediate parent class object.

Binding is a process of unifying the method call with the method’s code segment. Late binding happens when the method’s code segment is unknown until it is called java 7 certifications during the runtime. No, Java does not support the Overloading of a static method. The process would throw an error reading “static method cannot be referenced.”

System.out.println() in Java outputs the argument that was supplied to it. On the monitor, the println() method displays the findings. An Exception handling in Java is considered an unexpected event that can disrupt the program’s normal flow. These events can be fixed through the process of Exception Handling.