TAILIEUCHUNG - Lecture Programming languages (2/e): Chapter 13c - Tucker, Noonan

Chapter 13c - Java. Java is a mixed language containing both primitive data types, such as int, and objects. Java uses copy semantics for primitive data types and reference seman~ tics for objects. All methods must exist as part of some class and are virtual by default. Java (and its cousin, C#) benefit by not trying to remain totally backward compatible with C, unlike C++. | Programming Languages 2nd edition Tucker and Noonan Chapter 13 Object-Oriented Programming I am surprised that ancient and Modern writers have not attributed greater importance to the laws of inheritance . Alexis de Tocqueville Contents Prelude: Abstract Data Types The Object Model Smalltalk Java Python Java released in 1995 (or Java 5) in 2004 major language changes: , steady growth in SE libraries mixed language primitive types: int, double, boolean objects statically typed single inheritance Direct support for: inner classes visibility modifiers abstract classes interfaces generics run time type identification reflection Example: Symbolic Differentiation Implement symbolic differentiation State rules Simplification separate Use of abstract syntax Symbolic Differentiation Rules Figure Example d/dx (2*x+1) d/dx (2*x+1) = d/dx (2*x) + d/dx 1 = x * d/dx 2 + 2 * d/dx x + 0 = x * 0 + 2 * 1 + 0 -- simplified algebraically: 2 Abstract Syntax of Expressions Expression = Variable

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