Join Peggy Fisher for an in-depth discussion in this video Using decisions, part of Java Essential Training for Students.
- Now that we've had a review of Data Types,…let's talk about adding decision-making logic in Java.…When adding decision-making logic in Java,…the programmer often uses Relational Operators…to compare two values,…such as, <, <=,…>, >=, ==,…which, remember, is two = signs, or !=.…Do you remember what the "not" symbol is?…It's the !, Shift + 1.…
In addition, sometimes it is necessary…to join two or more statements.…This can be done using Logical operators:…"and", which is two &,…and "or", which is two |.…Remember that the result of any comparison…is always a Boolean value, either true or false.…Here is another example program…with some decision-making logic added.…Let's take a look.…I start out with a println statement…that asks the user to enter their age.…
We read that value in, on line 14, and age = in.nextIn ( ).…Now, we use the Relational Operator <…to compare the value entered by the user…to determine the age grouping of this person.…If the age < 2, it's gonna print out "Infant",…else if the age < 12, it'll print out "Child".…
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: Using decisions