Article Categories
- All Categories
-
Data Structure
-
Networking
-
RDBMS
-
Operating System
-
Java
-
MS Excel
-
iOS
-
HTML
-
CSS
-
Android
-
Python
-
C Programming
-
C++
-
C#
-
MongoDB
-
MySQL
-
Javascript
-
PHP
-
Economics & Finance
Object Oriented Programming Articles
Page 481 of 589
Java Program to reverse a given String with preserving the position of space.
You can reverse the contents of a given String using leaving the spaces using the reverse() method of the StringBuffer class.Examplepublic class Test { public static void main(String args[]) { String str = "hi welcome to Tutorialspoint"; String strArray[] = str.split(" "); StringBuffer sb= new StringBuffer(str); sb.reverse(); for(int i=0 ; i
Read MoreHow to remove the last character from a string in Java?
The StringBuffer class contains a method known as deleteCharAt(). This method deletes the character at a specified index/position. You can use this method to delete/remove a particular character from a string in Java.Examplepublic class Test { public static void main(String args[]){ String str = "hi welcome to Tutorialspoint"; StringBuffer sb= new StringBuffer(str); sb.deleteCharAt(sb.length()-1); System.out.println(sb); } }Outputhi welcome to Tutorialspoint
Read MoreHow multiple inheritance is implemented using interfaces in Java?
Java does not support multiple inheritance. This means that a class cannot extend more than one class. Therefore, following is illegal −Examplepublic class extends Animal, Mammal{}However, a class can implement one or more interfaces, which has helped Java get rid of the impossibility of multiple inheritance.The extends keyword is used once, and the parent interfaces are declared in a comma-separated list.For example, if the Hockey interface extended both Sports and Event, it would be declared as −Examplepublic interface Hockey extends Sports, Event
Read MoreHow to build an ant file for a Java Eclipse project?
Follow the steps given below, to integrate Ant into Eclipse.Make sure that the build.xml is a part of your java project, and does not reside at a location that is external to the project.Enable Ant View by following Window > Show View > Other > Ant > Ant.Open Project Explorer, drag the build.xml into the Ant View.Your Ant view looks similar to –Clicking on the targets, build / clean / usage will run Ant with the target. Clicking "fax" will execute the default target - usage.The Ant Eclipse plugin also comes with a good editor for editing build.xml files. The ...
Read MoreWhat is the base class for errors and exceptions in Java?
All exception classes are subtypes of the java.lang.Exception class. The Exception class is a subclass of the Throwable class. Other than the Exception class there is another subclass called Error which is derived from the Throwable class.
Read MoreHow to declare, create, initialize and access an array in Java?
You can declare an array just like a variable −int myArray[];You can create an array just like an object using the new keyword −myArray = new int[5];You can initialize the array by assigning values to all the elements one by one using the index −myArray [0] = 101; myArray [1] = 102;You can access the array element using the index values −System.out.println("The first element of the array is: " + myArray [0]); System.out.println("The first element of the array is: " + myArray [1]); Alternatively, you can create and initialize an array using the flower braces ({ }): Int [] myArray = {10, 20, 30, 40, 50}
Read MoreWhat is the try block in Java?
A try/catch block is placed around the code that might generate an exception. Code within a try/catch block is referred to as protected code, and the syntax for using try/catch looks like the following –Syntaxtry { // Protected code } catch (ExceptionName e1) { // Catch block }The code which is prone to exceptions is placed in the try block. When an exception raised inside a try block, instead of terminating the program JVM stores the exception details in the exception stack and proceeds to the catch block.
Read MoreWhat is Deserialization in Java?
After a serialized object has been written into a file, it can be read from the file and Deserialized that is, the type information and bytes that represent the object and its data can be used to recreate the object in memory.Exampleimport java.io.*; public class DeserializeDemo { public static void main(String [] args) { Employee e = null; try { FileInputStream fileIn = new FileInputStream("/tmp/employee.ser"); ...
Read MoreWhat is the difference between Serialization and Deserialization in Java?
Serialization Java provides a mechanism, called object serialization where an object can be represented as a sequence of bytes that includes the object's data as well as information about the object's type and the types of data stored in the object.Exampleimport java.io.*; public class SerializeDemo { public static void main(String [] args) { Employee e = new Employee(); e.name = "Reyan Ali"; e.address = "Phokka Kuan, Ambehta Peer"; e.SSN = 11122333; ...
Read MoreWhich method must be implemented by all threads in Java?
While creating a thread class we must override the run() method of the Thread class. This method provides an entry point for the thread and you will put your complete business logic inside this method.Exampleclass ThreadDemo extends Thread { private String threadName; ThreadDemo( String name) { threadName = name; System.out.println("Creating " + threadName ); } public void run() { System.out.println("Running " ...
Read More