Chapter 13
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This document discusses various Java collection classes and interfaces. It explains that collections can only hold objects, and primitive types must be wrapped. An iterator is an object that iterates through a collection. The Iterator interface has next() and hasNext() methods. The document also discusses LinkedList, HashSet, TreeSet, and how to implement comparable for sorting.
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The document discusses event-driven programming concepts like event sources, listeners, and mouse events. It explains that event sources raise events that are responded to by event listeners. It provides an example of a MouseClick applet that draws ovals in response to mouse click events. It also covers using timers to raise events at intervals and implementing anonymous inner classes to listen for timer events.
Chapter 05
The document discusses different types of program control structures in code including branching, looping, and logical operators. It describes if, else-if, and switch statements for branching based on conditions. It also covers different loop structures like while, for, and do-while loops. Nested if statements and logical operators like AND, OR, and NOT are presented for combining conditional tests.
Chapter 04
Variables store values within methods and can change as the method processes data. There are different types of variables such as local variables, which only maintain their value within the block of code they are declared in. Operators are symbols that perform actions in a program, such as assignment (=), mathematical (+,-,*,/), and relational (<,>,==,!=) operators. Constants are variables designated with the final keyword that have a fixed value that cannot be changed.
Chapter 03
This document discusses key concepts of object-oriented programming including classes, interfaces, encapsulation, data hiding, delegation, fields, access modifiers, methods, constructors, static members, and the this keyword. It explains that classes define public interfaces and private implementations, and that encapsulation involves containing all class responsibilities. Fields hold class data, and access modifiers control visibility. Methods define behavior, and accessor/mutator methods are used to follow data hiding. Constructors initialize objects, and static members are shared among instances. The dot operator indicates class/object membership.
Chapter 02
This document provides an overview of key concepts in object-oriented programming and Java, including models, classes, objects, fields, methods, object relationships, and the steps to write a Java program. It explains that classes define types through their characteristics and behaviors, while objects are instances of classes. Fields define object properties and methods describe capabilities. The document also covers compiling Java code, types of Java programs, and basic analysis of a HelloWorld example program.
Chapter 01
The document summarizes the history and development of computers from ancient counting devices like the abacus to modern PCs. It discusses early inventions in the 19th century that helped develop basic computer components. During World War II, the first generation of computers was developed for code breaking and calculations. The second generation saw transistors replace vacuum tubes and software stored on punch cards. Integrated circuits led to smaller, more powerful third generation computers. The fourth generation saw affordable personal computers introduced. The document then defines computer hardware and software components.
13 java in oracle
This document provides an introduction and overview of using Java stored procedures in Oracle databases. It discusses the advantages of using Java over PL/SQL, how to create and load Java classes into the database, how to define call specifications for Java methods, debugging and resolving issues, and using tools like Loadjava and Toad. The document is intended to educate developers on Oracle's Java stored procedure capabilities.
Java tut1 Coderdojo Cahersiveen
This document provides an overview of the Java programming language. It discusses key features such as platform independence, object-oriented programming principles like inheritance and polymorphism, automatic memory management, and security features. It also covers basic Java concepts like primitive data types, variables, operators, flow control statements, methods, and classes.
My 3 min pitch pack
This document outlines a business proposal, beginning with introducing the person or company presenting the proposal and where they are based. It then describes the business problem or idea in bullet points, keeping it simple. The proposal discusses the solution to the problem and how the business model would make money, such as through marketing and sales. It provides an overview of potential financials and lays out a future action plan, including what has been done so far, next steps, required funding, and needed personnel.
Things to do
The document discusses development for a client. It focuses on creating a plan to build new features for the client's software while ensuring the changes don't disrupt existing functionality or the current user experience. The development needs to be done carefully and methodically to avoid introducing bugs or breaking the application.
House in order
The document provides information on funding and support available for starting a new business in Ireland. It lists various government grants and agencies that offer funding in multiple phases. These include Enterprise Ireland, local enterprise boards, and advice on setting up a business from Citizens Information. Contact details and website URLs are also included to find more information on applying for financial assistance when starting a new company.
Blank 10 all you need
This document outlines the key sections needed to create a business plan, including an overview of the problem and solution being addressed, the business model, marketing and sales strategies, competition, financial projections, and action plan. The sections are meant to clearly describe the business idea, how it solves customer needs, how it will generate revenue, potential competitors, forecasted finances, and next steps.
Goals
This document discusses the importance of goal-setting by outlining the key steps: having a clear vision, defining long-term goals that support your vision, and taking action through testing and reassessing your progress on a regular basis. It also includes several quotes emphasizing the importance of fundamentals, striving for perfection, and not placing limits on what you think you can achieve.
Idea's1 only
The document provides an overview of idea generation and creative thinking. It discusses that 95% of creativity comes from perspiration rather than inspiration, and that while only 5% of adults consider themselves creative, 95% of children aged 5-10 exhibit strong creativity. It also lists several famous entrepreneurs and their ages when founding influential companies, generally in their early 20s or 30s. The document then provides strategies for idea generation, such as brainstorming, researching trends and influences, and maintaining an ideas notebook.
New frontiers motivation
The document discusses motivation and success. It describes Abraham Maslow's hierarchy of needs and goals. It then discusses how success can be redefined as a long-term process of continual development and learning from setbacks and failures, rather than just the achievement of a single outcome. The key is to not give up and keep trying through change, plans, mentors, time management, breaking habits, and focusing on progress rather than just outcomes.
The only slides you need
This document outlines the key components of a business plan including an introduction of the business or product, the problem it solves, the proposed solution and business model, how it provides unique value to customers, the marketing and sales strategy, competitive landscape, management team, and financial projections.
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Chapter 13
- 2. 13 Object Wrappers Collections can only hold objects. Primitive types (int, double, float,etc.) are not objects. Primitives must be wrapped in special wrapper objects. Wrappers exist for each of the eight primitive types.
- 3. 13 What is an iterator? An iterator is an object that encapsulates the ability to iterate through or visit each element in the collection.
- 4. 13 Using the Iterator Interface hasNext() method determines if there are more elements in the array next() method returns the next element and advances the iterator
- 5. 13 The DrawShapes Application User clicks in applet window to create one of three random shapes. Each shape is added to a collection. When user clicks in applet window, the collection is checked to see if a “hit” is registered on an existing shape. When a “hit” occurs, the shape’s color will change randomly.
- 6. 13 The Shape Inheritance Hierarchy Abstract class OurShape implements: changeColorRandomly() to change the color of an object by randomly selecting a color contains() to determine whether x, y coordinates of a mouse click fall within a shape’s boundaries draw() to draw the shape at x, y coordinates specified by a mouse click
- 7. 13 Classes Derived from OurShape OurRectangle OurTriangle OurCircle
- 8. 13 What is a linked list? A LinkedList is a more powerful data structure that allows for quick and easy insertion and removal of elements.
- 9. 13 Linked Lists LinkedLists come in two types: Singly linked list—each node knows only the next node Doubly linked list—each node knows both the previous and the next node
- 10. 13 What is a set? A set is a collection with no duplicate elements. Programmer needs to determine what constitutes a “duplicate.” The equals() method can be used to provide an additional definition of equality.
- 11. 13 HashSet Based on a hash table, a HashSet is a powerful data structure that can be used to retrieve objects quickly in a set. Unordered collection A hash code is used to organize objects in a HashSet
- 12. 13 TreeSet TreeSet provides the properties of a set in a sorted collection. Objects can be inserted in any order but are retrieved in sorted order Uses Comparable interface to compare objects for sorting Primitive types and String objects are comparable Up to programmer to implement the compareTo() method for user-defined objects