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Modern Programming Languages-I
Introduction to Java
Java was developed by a team led by James Gosling at Sun Microsystems. Originally
called Oak, it was designed in 1991 for use in embedded consumer electronic appliances.
In 1995, renamed Java, it was redesigned for developing Internet applications.
Java is a simple, object-oriented, distributed, interpreted, robust, secure, architecture-neutral,
portable, high- performance, multi-threaded, and dynamic language
- Java API
The application program interface (API) contains predefined classes and interfaces for
developing Java programs. The Java language specification is stable, but the API is still
expanding. At the Sun Java website (java.sun.com), you can view and download the
latest version of the Java API.
Java -- Language + Libraries
Java has two parts...
1. The core language -- variables, arrays, objects
The Java Virtual Machine (JVM) runs the core language
The core language is simple enough to run on small devices -- phones, smart cards, PDAs.
2. The libraries
Java includes a large collection of standard library classes to provide "off the shelf" code.
(Useful built-in classes that comes with the language to perform basic tasks)
Example of these classes is String, ArrayList, HashMap, StringTokenizer (to break
string into substrings), Date ...
Java programmers are more productive in part because they have access to a large set of
standard, well documented library classes.
Java Application Types
1. Java Application programming
Java application program is the one which run on your computer under the O.S of your
computer.
2. Java Applet Programming
Java applet is an application designed to be transmitted over the Internet and executed
java compatible web browser.
Week 1
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Modern Programming Languages-I
- Java Program Structure
Questions
1. What are the input and output of a Java compiler?
2. Explain the Java keywords. List some Java keywords you learned ?
3. Is Java case-sensitive? What is the case for Java keywords?
4. What is the Java source filename extension, and what is the Java bytecode
filename extension?
5. What is a comment? What is the syntax for a comment in Java? Is the comment
ignored by the compiler?
6. What is the statement to display a string on the console?
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Modern Programming Languages-I
Identify and fix the errors in the following code:
public class Welcome {
public void Main(String[] args) {
System.out.println('Welcome to Java!);
}
}
7. What is the command to compile a Java program? What is the command to run
a Java application?
Week 1
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