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app/src/main/java/com/example/algorithmstudy/pattern/structure/composite/InfantrySquad.kt

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+package com.example.algorithmstudy.pattern.structure.composite
+
+class InfantrySquad(val units: MutableList<InfantryUnit> = mutableListOf()) {
+
+    constructor(vararg units: InfantryUnit) : this(mutableListOf()) {
+        units.forEach {
+            this.units.add(it)
+        }
+    }
+}

app/src/main/java/com/example/algorithmstudy/pattern/structure/composite/InfantryUnit.kt

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+package com.example.algorithmstudy.pattern.structure.composite
+
+interface InfantryUnit {
+}

app/src/main/java/com/example/algorithmstudy/pattern/structure/composite/Rifleman.kt

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+package com.example.algorithmstudy.pattern.structure.composite
+
+class Rifleman: InfantryUnit {
+}

app/src/main/java/com/example/algorithmstudy/pattern/structure/composite/RocketSoldier.kt

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+package com.example.algorithmstudy.pattern.structure.composite
+
+class RocketSoldier : InfantryUnit {
+}

app/src/main/java/com/example/algorithmstudy/pattern/structure/composite/Sniper.kt

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+package com.example.algorithmstudy.pattern.structure.composite
+
+class Sniper : InfantryUnit {
+}

app/src/main/java/com/example/algorithmstudy/pattern/structure/flyweight/Minigun.kt

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+package com.example.algorithmstudy.pattern.structure.flyweight
+
+class Minigun : Weapon {
+    override fun fire() {
+        println("fire $this")
+    }
+
+    override fun reload() {
+        println("reload $this")
+    }
+
+    override fun fix() {
+        println("fix $this")
+    }
+}

app/src/main/java/com/example/algorithmstudy/pattern/structure/flyweight/Shotgun.kt

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+package com.example.algorithmstudy.pattern.structure.flyweight
+
+class Shotgun : Weapon {
+    override fun fire() {
+        println("fire $this")
+    }
+
+    override fun reload() {
+        println("reload $this")
+    }
+
+    override fun fix() {
+        println("fix $this")
+    }
+}

app/src/main/java/com/example/algorithmstudy/pattern/structure/flyweight/Weapon.kt

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+package com.example.algorithmstudy.pattern.structure.flyweight
+
+interface Weapon {
+    fun fire()
+    fun reload()
+    fun fix()
+}

app/src/main/java/com/example/algorithmstudy/pattern/structure/flyweight/WeaponFactory.kt

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+package com.example.algorithmstudy.pattern.structure.flyweight
+
+import android.annotation.SuppressLint
+
+class WeaponFactory {
+    private val weaponMap = mutableMapOf<String, Weapon?>()
+
+    @SuppressLint("NewApi")
+    fun getWeapon(type: String): Weapon? {
+        if (weaponMap[type] == null) {
+            weaponMap[type] = when (type) {
+                WEAPON_SHOTGUN -> Shotgun()
+                WEAPON_MINIGUN -> Minigun()
+                else -> null
+            }
+        }
+
+        return weaponMap[type]
+    }
+
+    companion object {
+        const val WEAPON_SHOTGUN = "shotgun"
+        const val WEAPON_MINIGUN = "minigun"
+    }
+}

app/src/test/java/com/example/algorithmstudy/design_pattern/CompositeTest.kt

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+package com.example.algorithmstudy.design_pattern
+
+import com.example.algorithmstudy.pattern.structure.composite.InfantrySquad
+import com.example.algorithmstudy.pattern.structure.composite.Rifleman
+import com.example.algorithmstudy.pattern.structure.composite.RocketSoldier
+import com.example.algorithmstudy.pattern.structure.composite.Sniper
+import org.junit.Test
+
+/**
+ *  Composite Pattern
+ *
+ *  - 유사한 클래스의 일반화하여 통합 관리할 수 있는 패턴
+ */
+class CompositeTest {
+
+    @Test
+    fun testComposite() {
+        val squad = InfantrySquad(Rifleman(), Rifleman(), Sniper(), RocketSoldier())
+
+        println(squad.units)
+    }
+}

app/src/test/java/com/example/algorithmstudy/design_pattern/FlyweightTest.kt

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+package com.example.algorithmstudy.design_pattern
+
+import com.example.algorithmstudy.pattern.creation.prototype.MyComputer
+import com.example.algorithmstudy.pattern.structure.flyweight.WeaponFactory
+import org.junit.Test
+
+/**
+ *  Flyweight Pattern
+ *
+ *  - 단일 객체 생성으로 메모리 효율을 높이는 패턴
+ */
+class FlyweightTest {
+
+    @Test
+    fun testFlyweight() {
+        val factory = WeaponFactory()
+
+        println(factory.getWeapon(WeaponFactory.WEAPON_MINIGUN))
+        println(factory.getWeapon(WeaponFactory.WEAPON_MINIGUN))
+        println(factory.getWeapon(WeaponFactory.WEAPON_SHOTGUN))
+        println(factory.getWeapon(WeaponFactory.WEAPON_SHOTGUN))
+    }
+}