From 91ac0588386b8f0ef730f636fa9eb07b56f93b15 Mon Sep 17 00:00:00 2001 From: Anshul Bansal Date: Sat, 16 Feb 2019 05:37:14 +0200 Subject: [PATCH] Bael 2726 introduction to traits in groovy (#6337) * BAEL-2726_Introduction_to_Traits_in_Groovy * BAEL-2726_Introduction_to_Traits_in_Groovy --- .../com/baeldung/traits/AnimalTrait.groovy | 8 ++ .../groovy/com/baeldung/traits/Dog.groovy | 9 ++ .../com/baeldung/traits/Employee.groovy | 12 ++ .../groovy/com/baeldung/traits/Human.groovy | 6 + .../com/baeldung/traits/SpeakingTrait.groovy | 13 ++ .../com/baeldung/traits/UserTrait.groovy | 36 ++++++ .../com/baeldung/traits/WalkingTrait.groovy | 13 ++ .../com/baeldung/traits/TraitsUnitTest.groovy | 114 ++++++++++++++++++ 8 files changed, 211 insertions(+) create mode 100644 core-groovy/src/main/groovy/com/baeldung/traits/AnimalTrait.groovy create mode 100644 core-groovy/src/main/groovy/com/baeldung/traits/Dog.groovy create mode 100644 core-groovy/src/main/groovy/com/baeldung/traits/Employee.groovy create mode 100644 core-groovy/src/main/groovy/com/baeldung/traits/Human.groovy create mode 100644 core-groovy/src/main/groovy/com/baeldung/traits/SpeakingTrait.groovy create mode 100644 core-groovy/src/main/groovy/com/baeldung/traits/UserTrait.groovy create mode 100644 core-groovy/src/main/groovy/com/baeldung/traits/WalkingTrait.groovy create mode 100644 core-groovy/src/test/groovy/com/baeldung/traits/TraitsUnitTest.groovy diff --git a/core-groovy/src/main/groovy/com/baeldung/traits/AnimalTrait.groovy b/core-groovy/src/main/groovy/com/baeldung/traits/AnimalTrait.groovy new file mode 100644 index 0000000000..6ec5cda571 --- /dev/null +++ b/core-groovy/src/main/groovy/com/baeldung/traits/AnimalTrait.groovy @@ -0,0 +1,8 @@ +package com.baeldung.traits + +trait AnimalTrait { + + String basicBehavior() { + return "Animalistic!!" + } +} \ No newline at end of file diff --git a/core-groovy/src/main/groovy/com/baeldung/traits/Dog.groovy b/core-groovy/src/main/groovy/com/baeldung/traits/Dog.groovy new file mode 100644 index 0000000000..3e0677ba18 --- /dev/null +++ b/core-groovy/src/main/groovy/com/baeldung/traits/Dog.groovy @@ -0,0 +1,9 @@ +package com.baeldung.traits + +class Dog implements WalkingTrait, SpeakingTrait { + + String speakAndWalk() { + WalkingTrait.super.speakAndWalk() + } + +} \ No newline at end of file diff --git a/core-groovy/src/main/groovy/com/baeldung/traits/Employee.groovy b/core-groovy/src/main/groovy/com/baeldung/traits/Employee.groovy new file mode 100644 index 0000000000..b3e4285476 --- /dev/null +++ b/core-groovy/src/main/groovy/com/baeldung/traits/Employee.groovy @@ -0,0 +1,12 @@ +package com.baeldung.traits + +class Employee implements UserTrait { + + String name() { + return 'Bob' + } + + String lastName() { + return "Marley" + } +} \ No newline at end of file diff --git a/core-groovy/src/main/groovy/com/baeldung/traits/Human.groovy b/core-groovy/src/main/groovy/com/baeldung/traits/Human.groovy new file mode 100644 index 0000000000..e78d59bbfd --- /dev/null +++ b/core-groovy/src/main/groovy/com/baeldung/traits/Human.groovy @@ -0,0 +1,6 @@ +package com.baeldung.traits + +interface Human { + + String lastName() +} \ No newline at end of file diff --git a/core-groovy/src/main/groovy/com/baeldung/traits/SpeakingTrait.groovy b/core-groovy/src/main/groovy/com/baeldung/traits/SpeakingTrait.groovy new file mode 100644 index 0000000000..f437a94bd9 --- /dev/null +++ b/core-groovy/src/main/groovy/com/baeldung/traits/SpeakingTrait.groovy @@ -0,0 +1,13 @@ +package com.baeldung.traits + +trait SpeakingTrait { + + String basicAbility() { + return "Speaking!!" + } + + String speakAndWalk() { + return "Speak and walk!!" + } + +} \ No newline at end of file diff --git a/core-groovy/src/main/groovy/com/baeldung/traits/UserTrait.groovy b/core-groovy/src/main/groovy/com/baeldung/traits/UserTrait.groovy new file mode 100644 index 0000000000..3f1e694f17 --- /dev/null +++ b/core-groovy/src/main/groovy/com/baeldung/traits/UserTrait.groovy @@ -0,0 +1,36 @@ +package com.baeldung.traits + +trait UserTrait implements Human { + + String sayHello() { + return "Hello!" + } + + abstract String name() + + String showName() { + return "Hello, ${name()}!" + } + + private String greetingMessage() { + return 'Hello, from a private method!' + } + + String greet() { + def msg = greetingMessage() + println msg + msg + } + + def whoAmI() { + return this + } + + String showLastName() { + return "Hello, ${lastName()}!" + } + + String email + String address +} + \ No newline at end of file diff --git a/core-groovy/src/main/groovy/com/baeldung/traits/WalkingTrait.groovy b/core-groovy/src/main/groovy/com/baeldung/traits/WalkingTrait.groovy new file mode 100644 index 0000000000..66cff8809f --- /dev/null +++ b/core-groovy/src/main/groovy/com/baeldung/traits/WalkingTrait.groovy @@ -0,0 +1,13 @@ +package com.baeldung.traits + +trait WalkingTrait { + + String basicAbility() { + return "Walking!!" + } + + String speakAndWalk() { + return "Walk and speak!!" + } + +} \ No newline at end of file diff --git a/core-groovy/src/test/groovy/com/baeldung/traits/TraitsUnitTest.groovy b/core-groovy/src/test/groovy/com/baeldung/traits/TraitsUnitTest.groovy new file mode 100644 index 0000000000..0c74a9be62 --- /dev/null +++ b/core-groovy/src/test/groovy/com/baeldung/traits/TraitsUnitTest.groovy @@ -0,0 +1,114 @@ +package com.baeldung.traits + +import spock.lang.Specification + +class TraitsUnitTest extends Specification { + + Employee employee + Dog dog + + void setup () { + employee = new Employee() + dog = new Dog() + } + + def 'Should return msg string when using Employee.sayHello method provided by UserTrait' () { + when: + def msg = employee.sayHello() + then: + msg + msg instanceof String + assert msg == "Hello!" + } + + def 'Should return displayMsg string when using Employee.showName method' () { + when: + def displayMsg = employee.showName() + then: + displayMsg + displayMsg instanceof String + assert displayMsg == "Hello, Bob!" + } + + def 'Should return greetMsg string when using Employee.greet method' () { + when: + def greetMsg = employee.greet() + then: + greetMsg + greetMsg instanceof String + assert greetMsg == "Hello, from a private method!" + } + + def 'Should return MissingMethodException when using Employee.greetingMessage method' () { + when: + def exception + try { + employee.greetingMessage() + }catch(Exception e) { + exception = e + } + + then: + exception + exception instanceof groovy.lang.MissingMethodException + assert exception.message == "No signature of method: com.baeldung.traits.Employee.greetingMessage()"+ + " is applicable for argument types: () values: []" + } + + def 'Should return employee instance when using Employee.whoAmI method' () { + when: + def emp = employee.whoAmI() + then: + emp + emp instanceof Employee + assert emp.is(employee) + } + + def 'Should display lastName when using Employee.showLastName method' () { + when: + def lastNameMsg = employee.showLastName() + then: + lastNameMsg + lastNameMsg instanceof String + assert lastNameMsg == "Hello, Marley!" + } + + def 'Should be able to define properties of UserTrait in Employee instance' () { + when: + employee = new Employee(email: "a@e.com", address: "baeldung.com") + then: + employee + employee instanceof Employee + assert employee.email == "a@e.com" + assert employee.address == "baeldung.com" + } + + def 'Should execute basicAbility method from SpeakingTrait and return msg string' () { + when: + def speakMsg = dog.basicAbility() + then: + speakMsg + speakMsg instanceof String + assert speakMsg == "Speaking!!" + } + + def 'Should verify multiple inheritance with traits and execute overridden traits method' () { + when: + def walkSpeakMsg = dog.speakAndWalk() + println walkSpeakMsg + then: + walkSpeakMsg + walkSpeakMsg instanceof String + assert walkSpeakMsg == "Walk and speak!!" + } + + def 'Should implement AnimalTrait at runtime and access basicBehavior method' () { + when: + def dogInstance = new Dog() as AnimalTrait + def basicBehaviorMsg = dogInstance.basicBehavior() + then: + basicBehaviorMsg + basicBehaviorMsg instanceof String + assert basicBehaviorMsg == "Animalistic!!" + } +} \ No newline at end of file