Java Questions

Marker Interface A Marker Interface is an interface in Java that contains no methods or fields. It acts as a “tag” or “marker” to convey metadata to the JVM or compiler, enabling certain functionalities or behaviors in classes that implement these interfaces. An Interface that does not have any declaration inside but still enforces a […]

Program Description Write a java program to calculate the mean and standard deviation of the given population of numbers. IPO Chart Input We will take input from the user for the population of numbers. Process  mean = (x1 + x2 +… xn)/n sd = sqrt( ((x1- mean)^2 + (x2- mean)^2 +…+ (xn- mean)^2 )/n) Output […]

How to debug a Java program using Eclipse IDE? We can use the graphic debugger of the Eclipse IDE to debug the Java program. Let us see how to debug a program. Set a Breakpoint A breakpoint suspends program execution for you to examine the value of variables of the Java program under Debug. In […]

What is Java Reflection? Java Reflection is a powerful feature in the Java programming language that allows a program to inspect and manipulate the runtime behavior of classes, methods, fields, and constructors — even if they are private. Java Reflection is a mechanism for manipulating classes, interfaces, and objects at the runtime of the Java […]

Overview In this post, we will answer the question of How to convert String to Integer in Java. We can use Integer.valueOf() or the Integer.parseInt() methods to convert the string to integer. Both the methods may throw java.lang.NumberFormatException exception. We can add the conversion in the try-catch block to handle the exception. Integer.valueOf() We can use […]

Overview Let’s learn about a Java Class to answer the question. Java Class A Java class is a blueprint or prototype that defines the variables and the methods that are common to all objects of a certain kind. Java class template [access level] class (Name of the class) { Class definition: members and methods … […]