kotlin 기본

build.gradle

@@ -1,5 +1,6 @@
 plugins {
     id 'java'
+    id 'org.jetbrains.kotlin.jvm' version '1.9.20'
 }
 
 group 'org.example'
@@ -13,8 +14,19 @@ dependencies {
     implementation 'junit:junit:4.13.1'
     testImplementation 'org.junit.jupiter:junit-jupiter-api:5.7.0'
     testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.7.0'
+    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8"
 }
 
 test {
     useJUnitPlatform()
+}
+compileKotlin {
+    kotlinOptions {
+        jvmTarget = "17"
+    }
+}
+compileTestKotlin {
+    kotlinOptions {
+        jvmTarget = "17"
+    }
 }

src/main/java/algorithm/programmers/Integer_in_two_circles.java

@@ -4,8 +4,7 @@ public class Integer_in_two_circles {
 
     public long solution(int r1, int r2) {
 
-
-        return answer;
+        return 1;
     }
 
     public static void main(String[] args) {

src/main/java/algorithmKotlin/sample/sample.kt

@@ -0,0 +1,52 @@
+package algorithmKotlin.sample
+
+import java.time.DayOfWeek
+
+fun main() {
+    println("kotlin start")
+
+    println(varFunc())
+
+    println(valFunc())
+
+    println(forFun())
+
+    println(forFunStep())
+}
+
+fun varFunc() : Int {
+    var res : Int = 5
+
+    res = 7
+
+    return res
+}
+
+fun valFunc() : Int {
+
+    val res : Int = 6
+
+    return res
+}
+
+fun forFun() : Int {
+    var sum = 0
+    for (i in 1..10) {
+        sum += i
+    }
+    return sum
+}
+
+fun forFunStep() : Int {
+    var step = 0
+
+    for (i in 10 downTo 5 step 2) {
+        step += i
+    }
+    return step
+}
+
+fun whenFun(dayOfWeek: DayOfWeek) {
+
+
+}