- Okay, now comes the fun part.…Let's return to our Payroll application.…We have created the employee and the address classes…so let's take a look at the main class,…which I have open here, payroll.java.…You'll notice line 10 has "public static void main".…In this class, we're going to be able to create…objects for the address and the employee.…We're then going to print the values back out again.…We're going to try and change some of the values,…as well as use our "compareTo" methods.…
When we create a new object from a class definition,…it is actually called an "instance" of the class…and that's why we say we've instantiated a new object.…It is important to note that you must…instantiate an object by using a keyword "new".…We can create any number of employees…using this process.…For our example, I'm going to create two…employee objects but before I can create the employee,…I need to instantiate an address object.…
On line 11, I declare address "a1".…"a1" is my variable name.…I say "equals new", there's that key word…
Author
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
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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: Instantiating classes