Topic1 - Intro to Java

8/3/2019 Topic1 - Intro to Java

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Topic 1

Introduction to Java

Syaifulnizam Abd ManafM. IT (Computer Science), UKM

B. Eng Computer Engineering, UTM

Email: [email protected]


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Learning Outcomes When you have completed this topic you

will be able to:

Describe the Java environment

Describe the strength of Java

Explain the types of Java program

Compile and execute a Java program


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Oscar Nierstrasz 1.3

History


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Introduction

Starting from a failed project, Java has emerged as apopular programming language within a short period oftime.

JavaSoft Sun MicroSystems had successfully signed up 38licenses in only one year after the Java technology wasannounced.

Besides, it also successfully attracted 6000 programmers toattend the first seminar - JavaOne Developer

ConferenceTM in 1996. What is so special in Java that computer industries andbusinesses can accept it within a very short period of timecompared to other new technologies in the computerhistory?


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Traditional Environment vs

Java Environment


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Advantages of Using Bytecodes

Using bytecode as an intermediate and not allowing eachperson compile it into the machine language of whatevercomputer they want to run give us advantages.

A compiler has to understand Java in order to compile it. Compiler, on the other hand, is a complex program.

A Java bytecode interpreter, on the other hand, is a simpleprogram.

This makes it easy to write a bytecode interpreter for a new

type of computer; once that is done, that computer can runany compiled Java program.

It would be much difficult to write a Java compiler for thesame computer.


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Characteristics of Java Simple

Object Oriented

Platform Independent

Safe

H

igh Performance Multi-threaded


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Tool to Develop Java Programs When Java was introduced in 1995, JDK was the only development tool available.

Although what is provided in JDK is sufficient to develop any Java program, thefacilities provided for the programmer are outdated compared to the latestintegrated development environment for languages such as Visual Basic and C++.

Integrated Development Environment (IDE) refers to the software package thatcombines various development tools.

This includes program editor, compiler, debugger and other utilities.

Most IDE has features such as windows, drag-anddrop, and other graphicelements.

The aim is to make the software development process fast, efficient, and easy todebug.

Part of IDE uses the Rapid Applicatio

nDevelopme

nt (R

AD) approach. RAD accelerates the software development process by using tools such as the

interface designer.

Many of the Java IDE available in the market uses the graphical interface tosupport RAD.


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Some JavaIDE Software

The following are some Java IDE software with theirURLs:

WinEdit (http://www.winedit.com/)

Jcreator (http://www.jcreator.com)

Java Web IDE (http://www.chami.com/webide)

Symantec Caf/Visual Caf (http://www.symantec.com/)

Forte for Java (http://www.sun.com/forte/ffj/)

Microsoft Visual J++ (http://www.microsoft.com/java/sdk)

Visual Age (http://www-4.ibm.com/software/ad/vajava/)


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Writing Java Programs


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Java applications

stand-alone programs that run on you own

computer

can read and write data on your disk disk

applets

executed from within a browser window (e.g.

Netscape or Internet Explorer) can be loaded from the World Wide Web and

executed on another computer

cannot read or write data on your hard disk


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Structured Approach vs Object

Oriented Approach


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Writing and RunningApplets


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Java Application and Applet

Summary

Topic1 - Intro to Java

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