In this post we’ll talk about one of the programming construct array in Java. Topics covered are how to declare an array, how to create and initialize an array, how to store elements in an array and how to access those elements using array indexes, types of arrays in Java.…
In Java programming language when you create a class it contains variables and methods. In this tutorial we’ll learn about Java methods. In the post Writing First Java Program we have already seen one method; main method which begins the execution of the program. Methods in Java A method is…
Variables are used to store values that are used in your Java program. A Java variable is a name to a memory location that contains the value assigned to that variable. In this post we’ll see how to declare and initialize a variable in Java, types of variables in Java…
A package in Java is used to group a set of related classes and interfaces. In a big Java application containing hundreds or thousands of individual classes, grouping related classes and interfaces into packages helps to keep things organized. Package structure in Java Packages follow the same structure as directories…
In this post we’ll see the differences between shallow copy and deep copy in Java object cloning. To understand the differences it is very important to understand the concept of shallow copy and deep copy while cloning an object so first we’ll try to understand the concept using examples of…
Object cloning in Java is the process of creating a copy of an object. To clone an object in Java clone() method of the Object class is used. clone() method clone() method is defined in the Object class as a protected method. If you are going to write a clone()…
A primitive type is predefined by a programming language and is named by a reserved keyword. The primitive types represent single values not an object and primitive values do not share state with other primitive values. There are eight primitive data types in Java which are as follows- byte short…
Wrapper class in Java is a class whose object wraps a primitive type. When you need an object instead of a primitive type you can use Wrapper class to wrap the primitive type value in an object and use that object. When is Java Wrapper class needed Some of the…
This post shows what does “Cannot make a static reference to the non-static method or a non-static field” error means and how to fix that error. static reference to the non-static method or field In order to understand why this error “Cannot make a static reference to the non-static method…
Static block in Java is used to initialize the static variables (also known as class variables). To initialize instance variables there are constructors, where error handling or other logic can be used. To provide the same capability for class variables, there are static initialization blocks in Java. Syntax of Java…