Features of java technology
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The document outlines key features of Java technology, including its object-oriented, platform-independent, and secure nature. It describes the setup process for the Java environment on Windows, the basic syntax for Java programs, and guidelines for naming classes and methods. Additionally, it covers identifiers, modifiers, variable types, and the use of comments in Java programming.
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Java Basic Syntax
3. Method Names - All method names should start with a Lower Case letter.
If several words are used to form the name of the method, then each inner
word's first letter should be in Upper Case.
Example: public void myMethodName()
4. Program File Name - Name of the program file should exactly match the class
name.
When saving the file you should save it using the class name (Remember java is
case sensitive) and append '.java' to the end of the name. (if the file name and
the class name do not match your program will not compile).
Example : Assume ‘ MyFirstJavaProgram' is the class name. Then the file should
be saved as 'MyFirstJavaProgram.java'
5. public static void main(String args[]) - java program processing starts from the
main() method which is a mandatory part of every java program..](https://image.slidesharecdn.com/standardfeaturesofjavatechnology-150507060841-lva1-app6891/85/Features-of-java-technology-5-320.jpg)
Features of java technology
- 1. © Prognoz Technologies Pvt. Ltd Features of Java Technology
- 2. © Prognoz Technologies Pvt. Ltd Key Features of Java Technology Sun Microsystems has renamed the new J2 versions as Java SE, Java EE and Java ME respectively. Java is guaranteed to be Write Once, Run Anywhere Java is: 1. Object Oriented 2. Platform independent 3. Simple 4. Secure 5. Architectural- neutral 6. Portable 7. Robust 8. Multi-threaded 9. Interpreted 10.High Performance 11.Distributed 12.Dynamic
- 3. © Prognoz Technologies Pvt. Ltd Java Environment Setup Setting up the path for windows 2000/XP: Assuming you have installed Java in c:Program Filesjava JDK directory: 1. Right-click on 'My Computer' and select 'Properties'. 2. Click on the 'Environment variables' button under the 'Advanced' tab. 3. Now alter the 'Path' variable so that it also contains the path to the Java executable. Example, if the path is currently set to 'C:WINDOWSSYSTEM32', then change your path to read 'C:WINDOWSSYSTEM32;c:Program Filesjava JDKbin'. Popular Java Editors: 1. Notepad 2. Netbeans 3. Eclipse
- 4. © Prognoz Technologies Pvt. Ltd Java Basic Syntax When we consider a Java program it can be defined as a collection of objects that communicate via invoking each others methods. Inside Java Programs we have: 1. Object 2. Class 3. Methods 4. Instance Variables About Java programs, it is very important to keep in mind the following points. 1. Case Sensitivity - Java is case sensitive which means identifier Hello and hello would have different meaning in Java. 2. Class Names - For all class names the first letter should be in Upper Case. If several words are used to form a name of the class each inner words first letter should be in Upper Case. Example class MyFirstJavaClass
- 5. © Prognoz Technologies Pvt. Ltd Java Basic Syntax 3. Method Names - All method names should start with a Lower Case letter. If several words are used to form the name of the method, then each inner word's first letter should be in Upper Case. Example: public void myMethodName() 4. Program File Name - Name of the program file should exactly match the class name. When saving the file you should save it using the class name (Remember java is case sensitive) and append '.java' to the end of the name. (if the file name and the class name do not match your program will not compile). Example : Assume ‘ MyFirstJavaProgram' is the class name. Then the file should be saved as 'MyFirstJavaProgram.java' 5. public static void main(String args[]) - java program processing starts from the main() method which is a mandatory part of every java program..
- 6. © Prognoz Technologies Pvt. Ltd Java Identifiers: In java there are several points to remember about identifiers. They are as follows: 1. All identifiers should begin with a letter (A to Z or a to z ), currency character ($) or an underscore (_). 1. After the first character identifiers can have any combination of characters. 2. A key word cannot be used as an identifier. 3. Most importantly identifiers are case sensitive. 4. Examples of legal identifiers: age, $salary, _value, __1_value 5. Examples of illegal identifiers : 123abc, -salary
- 7. © Prognoz Technologies Pvt. Ltd Java Modifiers: Like other languages it is possible to modify classes, methods etc by using modifiers. There are two categories of modifiers. 1. Access Modifiers : default, public , protected, private 2. Non-access Modifiers : final, abstract, strictfp
- 8. © Prognoz Technologies Pvt. Ltd Java Variables: We would see following type of variables in Java: 1. Local Variables 2. Class Variables (Static Variables) 3. Instance Variables (Non static variables) Comments in Java : /* This is my first java program. * This will print 'Hello World' as the output * This is an example of multi-line comments. */ // This is an example of single line comment /* This is also an example of single line comment. */
- 9. © Prognoz Technologies Pvt. Ltd Java Keywords:
- 10. © Prognoz Technologies Pvt. Ltd Thank you!! 10