Timer TimerTask Java Introduction The classes, Timer and TimerTask from java.util package, introduced with JDK 1.3, are used with threads to animate the images at regular intervals of time. If the stipulated (delay) period of time is over, the Timer object can generate events. Simply by handling the event, the programmer can execute some user-defined …
Command-line Arguments Summary: In this Command-line Arguments, you will understand how to pass data to a running Java program through command prompt. command-line : The line where we give the command is known as command-line. It is an imaginary line and nothing but the command prompt. It is another style of giving values to the …
Note: Palindrome Example is available in second page. 1. Deleting the Characters To delete characters from StringBuffer, two methods exist – deleteCharAt() and delete(). Supported methods from String class StringBuffer deleteCharAt(int pos): Delete the character in the StringBuffer at the specified index number, pos. StringBuffer delete(int start, int end): Deletes all the characters in the …
To Java String find matching, we use three methods – overloaded indexOf() and lastIndexOf() and charAt(). Index numbers are given by the JVM implicitly to the characters in the string; the first character is given 0, the second one as 1 and so on. These index numbers are helpful in programming in searching operations. Following …
Java String Find matching characters indexOf(), lastIndexOf() Read More »
Here, we do some miscellaneous operations on strings like converting a string from lowercase to uppercase or vice versa, removing unwanted prefix and suffix whitespaces and replacing a few characters with replace() String. Supported methods from String class. String toLowerCase(): Returns a new string containing all lowercase characters. All the uppercase characters are converted into …
toUpperCase(), toLowerCase() and replace() String Read More »
Generally, the life cycle gives the same meaning for Servlets, Applets and Threads. Different states, a thread (or applet/servlet) comes under from its object creation to object removal (garbage collection) is known as life cycle of thread (or applet/servlet). There are four main states in the Thread Life cycle. Born state Runnable state Blocked state …
Types of Inheritance There exists basically three types of inheritance. Multilevel inheritance Multiple inheritance Hierarchical inheritance 1. In single inheritance, one class extends one class only. In multilevel inheritance, the ladder of single inheritance increases. 2. In multiple inheritance, one class directly extends more than one class. 3. In hierarchical inheritance one class is extended …
Subclass can make use of super class methods straight away by virtue of inheritnace. If the subclass does not satisfy about the functionality (output) of the super class method, the subclass can rewrite with its own functionality with the same method name. This concept is known as "method overriding", supported by OOP languages like C++/Java. …
this Keyword Java "this" keyword refers an object, to say, the current object. Observe the following program and pay attention to this.salary. public class Officer3 { int salary; public void display(int salary) { this.salary = salary; } public static void main(String args[]) { Officer3 o1 = new Officer3(); o1.display(5000); System.out.println(o1.salary); // 5000 } } In …
Composition has-a Relationship One of the goals of OOP languages is reusability. Java gives good importance for reusability. A method in Java can be called in two ways. With the objects of the same class (through composition) With the objects of other classes (through inheritance) Here we discuss the composition. class Bird { public void …
1st page given Applet Life Cycle, 2nd page given Applet API support methods and 3rd page given Applet Example. Various states, an applet, undergoes between its object creation and object removal (when the job is over) is known as Applet Life Cycle. Each state is represented by a method. There exists 5 states represented by …
Introduction Java is an object-oriented language and can view everything as an object. A simple file can be treated as an object (with java.io.File), an address of a system can be seen as an object (with java.util.URL), an image can be treated as an object (with java.awt.Image) and a simple data type can be converted …
An example on StringBuffer methods length() and capacity() is given in Simple terms for a Beginner. Finding length() and capacity() In Java coding, the programmer should be aware of not only methods of a class but also constructors. Constructors give the properties for an object at the time of creation itself. In the following program, …
Using Variables from Methods Summary : In this Java tutorial Using Variables from Methods , you understand how to call instance and local variables from methods. Observe keenly the difference of using variables from methods. An object is required to call instance variables but not local. You know, C/C++ global variables in Java are called …
Java Methods Method Overloading Using Methods The procedures and functions are known as methods in Java. The methods scope is for the whole class. Now here, you can make a small difference. A function in C-lang can be called without object but a method is to be called with an object. The first line of …
Java Local Instance Variables Summary: Explained in Java syntax in a simple way of using "Java Local Instance Variables" for a beginner. Variables – Properties A program stores values in variables. As the name indicates, a variable value can be varied by the programmer at any time. An object uses variables to set its properties. …
Java Example Compilation Execution Summary: By the end of this tutorial, you will understand how a "Java Example Compilation Execution" is done. What is a class in Java? Two concepts existed in the minds of Java designers from the day one of development – to make the language simple and easy to practice and platform-independent. …
OOPS concepts Tutorial Summary: By the end of this tutorial "OOPS concepts Tutorial", you will understand the meaning of OOPS concepts. Three basic concepts of OOPS Abstraction Encapsulation Polymorphism 1. Abstraction Abstraction means using the equipment (or code) without knowing the details of working. For example, you are using your mobile phone without knowing how …
Even though Java is projected as the most demanded language of the times, but has its own disadvantages. Of course, they are very minor in nature and need not be considered as drawbacks compared to the advantages it brings forward. Following is the list of Java Drawbacks a) Slow performance: The first and foremost drawback …
Java is born with some unique and interesting features that made it most powerful and demanded language of the times. Following are the Java Features Buzz Words a) Platform-Independent "Java compiled file known as .class file can be executed on any OS without bothering on which platform (OS) the source code was compiled". That is, …