Java Programming Essentials
Explore the fundamentals of Java programming, including control structures, data types, collections, objects, and classes. Learn about essential concepts like recursion, OOP, and working with arrays. Dive into Java collections, including ArrayList, LinkedList, HashMap, TreeSet, and PriorityQueue. Understand the core principles of classes and objects, abstraction, and object-oriented programming (OOP).
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Presentation Transcript
Context for CSE 143 CSE 142 Control: loops, if/else, methods, parameters, returns I/O: Scanners, user input, files Data: primitive types (int, double, etc.), arrays, classes CSE 143 Control: recursion Data Java collections Classes + Object Oriented Programming Best of CS 3
Collections collection: an object that stores data; a.k.a. "data structure" the objects stored are called elements some collections maintain an ordering; some allow duplicates typical operations: add, remove, clear, contains (search), size examples found in the Java class libraries: (covered in this course!) ArrayList, LinkedList, HashMap, TreeSet, PriorityQueue all collections are in the java.util package import java.util.*; 6
Client ArrayList ArrayList<String> list: [ a , b , c ] 16
Implementer - ArrayList String[] elementData: [ a , b , c , null, null, null, null, null, null] int size: 3 17
Recall: classes and objects class: A program entity that represents: A complete program or module, or A template for a type of objects. (ArrayList is a class that defines a type.) object: An entity that combines state and behavior. object-oriented programming (OOP): Programs that perform their behavior as interactions between objects. abstraction: Separation between concepts and details. Objects provide abstraction in programming. 18
