Join Peggy Fisher for an in-depth discussion in this video Managing ArrayLists, part of Java Essential Training for Students.
- The last type arrays that we're gonna talk about…is an ArrayLists.…There are several important differences…between an ArrayList and an array.…An ArrayList can only hold objects,…such as Strings.…When using an ArrayList,…you can increase and decrease the size dynamically.…To access the elements in an ArrayList,…we use the .get method,…and to update elements in an ArrayList,…we use the .set method.…If we wanna add an element,…we just use the .add element.…
We don't have to worry about the size of the ArrayList,…it'll automatically grow as we need it to.…And if you wanna take away an element,…or delete an element, you can use the .remove method.…Remember our pizza shop?…We mentioned that it might be nice to keep track…of more than one pizza at a time.…So let's see what happens when use…an ArrayList to hold our pizza objects.…Here's the main program for the PizzaShop.…At the top, I've already gone ahead…and imported the java.util.ArrayList;.…I'm gonna scroll down a little bit,…what we'll do is we'll add a while loop,…
Author
Peggy Fisher
Released
6/29/2015- Getting started with parsing
- Reviewing data types
- Using decisions
- Creating user-defined methods
- Command-line debugging
- Exploring the Java API
- Creating and instantiating classes
- Working with interfaces
- Storing items with arrays
Skill Level Intermediate
Duration
Views
Q: How can I make my debugger function like the author’s?
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Introduction
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Welcome58s
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1. Command Level Programming
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Challenge: Hello world1m 8s
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Solution: Hello world2m 22s
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2. Basics Review
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Reviewing data types4m 32s
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Using decisions2m 37s
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Managing loops4m 36s
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Challenge: College cost app1m 12s
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Solution: College cost app4m 23s
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3. Debugging
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Setting breakpoints1m 42s
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Stepping through the code4m 37s
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Command line debugging3m 50s
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Solution: Debugging5m 25s
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4. Java API
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Exploring the Java API3m 2s
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Challenge: API51s
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Solution: API2m 16s
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5. Simulations and Algorithm Analysis
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Using simulations3m 24s
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Random number generator3m 5s
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Analyzing algorithms4m 49s
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Leveraging recursion1m 59s
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Challenge: Monte Carlo2m 1s
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Solution: Monte Carlo3m 2s
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6. Classes and Objects
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Diagramming with UML1m 42s
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Creating classes7m 4s
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Using encapsulation1m 28s
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Instantiating classes7m 16s
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Avoiding null references4m 27s
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Challenge: Kathie's Catering2m 53s
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Solution: Kathie's Catering4m 41s
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7. More on Classes
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Introducing inheritance6m 35s
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Working with interfaces4m 30s
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Using polymorphism2m 14s
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Solution: Pizza ordering app3m 51s
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8. Data Structures
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Storing items with arrays4m 15s
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Utilizing 2D arrays3m 3s
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Managing ArrayLists5m 33s
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Enhanced for Loop5m 9s
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Challenge: Name finder1m 8s
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Solution: Name finder3m 42s
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Conclusion
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Next steps34s
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Video: Managing ArrayLists