Introduction to Java

Lecture 1

Java Programming (4343203)
Diploma in ICT - Semester IV
Gujarat Technological University

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Learning Objectives & Success Metrics

🎯 Core Learning Outcomes

By the end of this lecture, you will master:

📚 Analyze Java's evolution from 1991 to 2024
🔍 Evaluate Java's 13 key features with real examples
🌐 Categorize Java applications across 7 major domains
💼 Justify Java's dominance in enterprise development
🚀 Plan your personal Java learning roadmap
🧠 Synthesize how Java solves modern programming challenges

📊 Knowledge Assessment

Self-Check Questions:

Why did Java succeed where others failed?
How does WORA principle work technically?
Which Java features matter most for enterprise?
What career paths does Java enable?

Practical Skills:

Explain Java to a non-programmer
Choose appropriate Java applications
Identify Java-powered systems around you

🎯 Success Goal: Think like a Java architect!

Ready to master Java fundamentals? ☕✨

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History of Java

Timeline

1991 - Project Green started at Sun Microsystems
1995 - Java 1.0 released publicly
1996 - Java 1.1 with improved performance
1998 - Java 2 (J2SE 1.2) with Swing
2004 - Java 5 with generics and annotations
2006 - Java becomes open source
2009 - Oracle acquires Sun Microsystems
2014 - Java 8 with Lambda expressions
2017 - Java 9 with modules
Present - Java 21 LTS (Latest)

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Key People

James Gosling - Father of Java
Mike Sheridan - Co-creator
Patrick Naughton - Team member

Original Goals

Platform Independence
Network-oriented
Secure
Simple
Object-oriented

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Why was Java Created?

🎯 Original Purpose

• Interactive television
• Consumer electronics
• Set-top boxes
• Embedded systems

🌐 Web Revolution

• Internet boom (1990s)
• Platform independence needed
• Secure web applications
• Applets for browsers

"Write Once, Run Anywhere" (WORA)

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Java's Revolutionary Features - Deep Dive

🎯 Simplicity & Power

Simple Architecture:

No pointers (eliminates crashes)
Automatic memory management
Rich standard library
Consistent syntax rules

Real Impact:

40% faster development vs C++
60% fewer bugs in production
Easier team collaboration

🔒 Enterprise Security

Multi-Layer Security:

Bytecode verification
Runtime security manager
Cryptographic APIs
Secure class loading

Why Banks Choose Java:

Zero buffer overflow attacks
Controlled resource access
Audit trail capabilities

⚡ Performance Excellence

Smart Optimization:

JIT compiler learns patterns
Hotspot detection
Adaptive optimization
Parallel garbage collection

Benchmark Results:

95% of C++ performance
Scales to millions of users
Sub-millisecond response times

🌟 The WORA Revolution

Write Once
HelloWorld.java

✅

Compile Once
HelloWorld.class

⚙️

Run Anywhere
Windows, Linux, macOS

🌍

Save Millions
Development Cost

💰

🚀 Pro Insight: Java's features aren't just technical advantages—they're business solutions that have saved the industry billions in development costs!