Following table gives all the list of Java Marker interfaces. Maker interface name Functionality 1. java.io.Serializable the object is serialized 2. java.lang.Cloneable the object is cloned 3. javax.servlet.SingleThreadModel only one object of the servlet for one request is created 4. javax.ejb.EnterpriseBean the object can participate in transactions 5. java.util.RandomAccess the elements of the data structure …
JVM stands for Java Virtual Machine. As the name indicates, it is not a real machine; it is virtual or abstract which does not have a physical appearance. Like a physical machine converts one form into another, JVM also converts bytecode into binary code. Let us go further ih JVM Java Virtual Machine. We know …
2 tier vs 3 tier: Note: Before knowing the differences, it is advised to go through Introduction to 2-tier and 3-tier Architecture. Table on 2 tier vs 3 tier Feature 2-Tier 3-Tier Administration Complex as business logic and database exist on one system Simple as layers are separated Security Less secured as client can talk …
Tutorial 2 tier 3 tier: Regarding, 2-tier and 3-tier, many Web sites explain but looks me difficult to a very fresher to understand. Here, I give my own style of explanation. If you would like to change the content or style (way2java aim is to simplify the complexity) for better explanation., please pass your comments …
1. What is marker interface? By usage, a marker interface does not contain any methods or variables. It is completely empty interface and for this reason also known as empty interface. See these two marker interface definitions in Java API. java.lang.Cloneable and java.io.Serializable are two marker interfaces often used. See the output screen. No methods …
Does Call by reference Java supports? This is a very basic question asked in every interview and should known to each programmer also. Everyone says "no" as Java does not support pointers. No one actually see the address of the object in Java. No one can dream of call by reference without pointers with their …
Call by value and Call by reference Java Tutorial Read More »
Every language comes with data type casting and in Java, also exist object casting. For a novice, it is very confusing. Let us discuss different variations of Object Casting Problems. Before going though this, if you are not aware, it is advised to read Object Casting. Java supports object casting but with some restrictions. Case …
Java does not support Multiple Inheritance: Java designer, Mr.James Gosling, committed to keep Java very simple to practice even for novices; infact, it is one of goals and features of Java language. Towards this goal, he avoided multiple inheritance, operator overloading, pointers and prototype declaration etc. which adds unnecessary problems in coding like making the …
Java does not support operator overloading: Java is relatively a very simple language to use compared C/C++ with the non-support of complex and confusing features like pointers, multiple inheritance and operator overloading. These features are rarely used in practice and at the same time poorly understood by the language beginners. Every operator has a good …
Java designers keep only two things in their mind while language is being developed – a) to make programming simple to practice and 2) to increase performance. Towards this goal only Java does not support Pointers. Reasons for Java does not support Pointers: 1. The first and very important reason is the security. The concept …
Breaking the data into independent pieces is known as tokenization. For example, breaking a sentence into different words is known as tokenization. To do the job, Java comes with two tokenizers – StringTokenizer to tokenize a string and StreamTokenizer to tokenize a stream of data coming from I/O stream classes. Both are for very different …
Differences between StreamTokenizer and StringTokenizer in Java Read More »
Any C++ programmer would say, an instance of a class is known as object, when asked what an object is. It is a very confusing statement for a novice. I explain in my own way. Now imagine there is trunk of wood. The wood as it is waste until and unless converted into articles like …
In Java, object creation is known as instantiation because an instance of a class is object. Let us explain more through Instantiate Java. public class Demo { public static void main(String args[]) { Demo d1 = new Demo(); } } In the above code, d1 is known as object of Demo class. Other way, we …
Java coding is simple to practice. First reason, I give is Java does not support pointers. Due to many predefined methods available, with less code and in less time, you can do your task. For this reason, Java is known as "Production Language" . I give simple Java coding example printing "Employee Salary" for a …
In Java, just if you are given an object, you can tell the class name for which the object belongs; and also, its super classes etc. To get class name, the class you use is class Class. Do not confuse. There is a class called Class in Java like there exists Double class for data …
With Java newInstacnce() of class Class, we can create an object as you will do with new keyword. Example on Java newInstance public class Student { int marks; public void display() { System.out.println(“Hello 1”); } public static void main(String args[]) throws InstantiationException, IllegalAccessException, ClassNotFoundException { Student std1 = new Student(); std1.marks = 50; Class cls1 …
There exists a class by name Class in Java, like you know, Double class and double. The object of class Class contain runtime representation of a class. Java getClass () method is used to know a class’s super classes and interfaces, its name etc. Following code explains. Following is the class signature of class Class. …
Classes Objects Java tutorial explains creation of objects, writing classes, methods, variables etc. for a Beginner Java Classes To write the code in Java, a class is required. It is the basic construct for a Java program. Following denotes class by name Demo. public class Demo { // some code } The name of the …
Following topics give the conversions between different concepts of Java like, date to string, array to string, string to arraylist, numbers to words etc. Arrays 1. Byte Array to Char Array – Char Array to Byte Array 2. String to a) char array and b) byte Array 3. Char array & Byte array to String …
Sometimes, it is also needed to convert String to Date; we have seen earlier how to convert Date to String. Now Parse String to Date is done. Following code gets you the conversion of string to date. We use SimpleDateFormat class method parse(). Example on Parse String to Date import java.util.Date; import java.text.SimpleDateFormat; import java.text.ParseException; …
