# java-LoopingAndCollections **Repository Path**: mirrors_LambdaSchool/java-LoopingAndCollections ## Basic Information - **Project Name**: java-LoopingAndCollections - **Description**: No description available - **Primary Language**: Unknown - **License**: MIT - **Default Branch**: master - **Homepage**: None - **GVP Project**: No ## Statistics - **Stars**: 0 - **Forks**: 0 - **Created**: 2020-09-25 - **Last Updated**: 2026-07-19 ## Categories & Tags **Categories**: Uncategorized **Tags**: None ## README # Java Looping Branching and Collections ## Introduction This project is used to introduce in Java * Looping * Branching and Conditionals * Collections including Arrays, ArrayLists, HashMaps, HashSets ## Layout The main class contains most of the work. The work in that class is meant to demonstrate certain commands, statements, and constructs to use when working with Collections. Most of the work is done using a class call Dog ![looping and collections diagram](loopingandcollections.png) ## Results The output of this application is ```TEXT *** Arrays *** *** Print out array *** The pointer to the array [Lloopingandcollections.Dog;@d041cf [Dogs{breed='Springer', avgWeight=50, apartment=false}, Dogs{breed='Bulldog', avgWeight=45, apartment=true}, Dogs{breed='Collie', avgWeight=45, apartment=false}, Dogs{breed='Chihuahua', avgWeight=5, apartment=true}, Dogs{breed='Corgie', avgWeight=35, apartment=true}] *** For Loop *** *** Dogs Not Good for Apartments *** Dogs{breed='Springer', avgWeight=50, apartment=false} Dogs{breed='Collie', avgWeight=45, apartment=false} Breed 3 good for apartment? true *** Let's Sort by Weight*** Dogs{breed='Chihuahua', avgWeight=5, apartment=true} Dogs{breed='Corgie', avgWeight=35, apartment=true} Dogs{breed='Bulldog', avgWeight=45, apartment=true} Dogs{breed='Collie', avgWeight=45, apartment=false} Dogs{breed='Springer', avgWeight=50, apartment=false} *** ArrayList *** *** Print ArrayList Using For Each *** Dogs{breed='Chihuahua', avgWeight=5, apartment=true} Dogs{breed='Corgie', avgWeight=35, apartment=true} Dogs{breed='Bulldog', avgWeight=45, apartment=true} Dogs{breed='Collie', avgWeight=45, apartment=false} Dogs{breed='Springer', avgWeight=50, apartment=false} Dogs{breed='Mutt', avgWeight=15, apartment=true} Print ArrayList with Switch Statement Chihuahua are 5 very small dogs Corgie are 35 large dogs Bulldog are 45 very large dogs Collie are 45 very large dogs Springer are 50 non-accounted for dogs Mutt are 15 small dogs *** Work with Elements *** No match for Bulldog Dogs{breed='Chihuahua', avgWeight=5, apartment=true} Dogs{breed='Corgie', avgWeight=35, apartment=true} Dogs{breed='Poodle', avgWeight=50, apartment=false} Dogs{breed='Bulldog', avgWeight=45, apartment=true} Dogs{breed='Collie', avgWeight=45, apartment=false} Dogs{breed='Springer', avgWeight=50, apartment=false} Dogs{breed='Mutt', avgWeight=15, apartment=true} dogArrayList is (size) 7 Dog[3] Dogs{breed='Bulldog', avgWeight=45, apartment=true} remove element at index 3 Dog[3] Dogs{breed='Collie', avgWeight=45, apartment=false} *** Let's Sort by Weight From Largest to Smallest*** Dogs{breed='Poodle', avgWeight=50, apartment=false} Dogs{breed='Springer', avgWeight=50, apartment=false} Dogs{breed='Collie', avgWeight=45, apartment=false} Dogs{breed='Corgie', avgWeight=35, apartment=true} Dogs{breed='Mutt', avgWeight=15, apartment=true} Dogs{breed='Chihuahua', avgWeight=5, apartment=true} *** HashMap *** *** Work with elements *** element with key 3 Dogs{breed='Corgie', avgWeight=35, apartment=true} Size of HashMap 6 Remove element with key 3 element with key 3 null And now Size of HashMap 5 *** Print the HashMap *** Key is 0 Value is Dogs{breed='Poodle', avgWeight=50, apartment=false} Key is 1 Value is Dogs{breed='Springer', avgWeight=50, apartment=false} Key is 2 Value is Dogs{breed='Collie', avgWeight=45, apartment=false} Key is 4 Value is Dogs{breed='Mutt', avgWeight=15, apartment=true} Key is 5 Value is Dogs{breed='Chihuahua', avgWeight=5, apartment=true} *** Let's Sort *** [5=Dogs{breed='Chihuahua', avgWeight=5, apartment=true}, 2=Dogs{breed='Collie', avgWeight=45, apartment=false}, 4=Dogs{breed='Mutt', avgWeight=15, apartment=true}, 0=Dogs{breed='Poodle', avgWeight=50, apartment=false}, 1=Dogs{breed='Springer', avgWeight=50, apartment=false}] *** Printed another way *** Key = 5 Value = Dogs{breed='Chihuahua', avgWeight=5, apartment=true} Key = 2 Value = Dogs{breed='Collie', avgWeight=45, apartment=false} Key = 4 Value = Dogs{breed='Mutt', avgWeight=15, apartment=true} Key = 0 Value = Dogs{breed='Poodle', avgWeight=50, apartment=false} Key = 1 Value = Dogs{breed='Springer', avgWeight=50, apartment=false} *** Print the Original HashMap *** Key is 0 Value is Dogs{breed='Poodle', avgWeight=50, apartment=false} Key is 1 Value is Dogs{breed='Springer', avgWeight=50, apartment=false} Key is 2 Value is Dogs{breed='Collie', avgWeight=45, apartment=false} Key is 4 Value is Dogs{breed='Mutt', avgWeight=15, apartment=true} Key is 5 Value is Dogs{breed='Chihuahua', avgWeight=5, apartment=true} *** HashSets *** Dogs{breed='Collie', avgWeight=45, apartment=false} Dogs{breed='Corgie', avgWeight=35, apartment=true} Dogs{breed='Springer', avgWeight=50, apartment=false} Dogs{breed='Springer', avgWeight=50, apartment=false} Dogs{breed='Chihuahua', avgWeight=5, apartment=true} Dogs{breed='Poodle', avgWeight=50, apartment=false} Dogs{breed='Mutt', avgWeight=15, apartment=true} *** HashSet of Strings *** The Current Size of the Set is 6 [Springer, Collie, Corgie, Mutt, Chihuahua, Poodle] Does the Set contain Labrador? false Does the Set contain Mutt? true Remove Mutt *** The set without mutt :-( *** The Current Size of the Set is 5 [Springer, Collie, Corgie, Chihuahua, Poodle] *** Recursion *** GCD Running with p = 100 q = 255 GCD Running with p = 255 q = 100 GCD Running with p = 100 q = 55 GCD Running with p = 55 q = 45 GCD Running with p = 45 q = 10 GCD Running with p = 10 q = 5 GCD Running with p = 5 q = 0 GCD Returning 5 gcd(100, 255) = 5 *** Do While Loop *** Picked: 9 Picked: 8 Picked: 5 Picked: 9 Picked: 7 ```