Introduction to Java#
Lecture 1#
Java Programming (4343203)
Diploma in ICT - Semester IV
Gujarat Technological University
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Learning Objectives & Success Metrics#
๐ฏ Core Learning Outcomes#
By the end of this lecture, you will master:
- ๐ Analyze Java’s evolution from 1991 to 2024
- ๐ Evaluate Java’s 13 key features with real examples
- ๐ Categorize Java applications across 7 major domains
- ๐ผ Justify Java’s dominance in enterprise development
- ๐ Plan your personal Java learning roadmap
- ๐ง Synthesize how Java solves modern programming challenges
๐ 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
๐ฏ Success Goal: Think like a Java architect!
Ready to master Java fundamentals? โโจ
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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?#
๐ฏ Original Purpose
- โข Interactive television
- โข Consumer electronics
- โข Set-top boxes
- โข Embedded systems
๐ Web Revolution
- โข Internet boom (1990s)
- โข Platform independence needed
- โข Secure web applications
- โข Applets for browsers
"Write Once, Run Anywhere" (WORA)
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Java’s Revolutionary Features - Deep Dive#
๐ฏ 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
๐ 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
โก 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
๐ The WORA Revolution#
Write Once
HelloWorld.javaโ
Compile Once
HelloWorld.classโ๏ธ
Run Anywhere
Windows, Linux, macOS
Windows, Linux, macOS
๐
Save Millions
Development Cost
Development Cost
๐ฐ
๐ Pro Insight: Java's features aren't just technical advantagesโthey're business solutions that have saved the industry billions in development costs!