第4章 類與面向?qū)ο缶幊痰?章 類與面向?qū)ο缶幊?/a>

public final class LoginUser {   @NotNull   private final String username;   @NotNull   private final String password;   @NotNull   public final String getUsername() {      return this.username;   }   @NotNull   public final String getPassword() {      return this.password;   }   public LoginUser(@NotNull String username, @NotNull String password) {      Intrinsics.checkParameterIsNotNull(username, "username");      Intrinsics.checkParameterIsNotNull(password, "password");      super();      this.username = username;      this.password = password;   }   @NotNull   public final String component1() {      return this.username;   }   @NotNull   public final String component2() {      return this.password;   }   @NotNull   public final LoginUser copy(@NotNull String username, @NotNull String password) {      Intrinsics.checkParameterIsNotNull(username, "username");      Intrinsics.checkParameterIsNotNull(password, "password");      return new LoginUser(username, password);   }   // $FF: synthetic method   // $FF: bridge method   @NotNull   public static LoginUser copy$default(LoginUser var0, String var1, String var2, int var3, Object var4) {      if ((var3 & 1) != 0) {         var1 = var0.username;      }      if ((var3 & 2) != 0) {         var2 = var0.password;      }      return var0.copy(var1, var2);   }   public String toString() {      return "LoginUser(username=" + this.username + ", password=" + this.password + ")";   }   public int hashCode() {      return (this.username != null ? this.username.hashCode() : 0) * 31 + (this.password != null ? this.password.hashCode() : 0);   }   public boolean equals(Object var1) {      if (this != var1) {         if (var1 instanceof LoginUser) {            LoginUser var2 = (LoginUser)var1;            if (Intrinsics.areEqual(this.username, var2.username) && Intrinsics.areEqual(this.password, var2.password)) {               return true;            }         }         return false;      } else {         return true;      }   }}

package com.easy.kotlindata class LoginUser(val username: String, val password: String)fun main(args: Array<string>) {    val loginUser = LoginUser("admin", "admin")    val (username, password) = loginUser    println("username = ${username}, password = ${password}") // username = admin, password = admin}</string>

@Retention(AnnotationRetention.RUNTIME)@Target(AnnotationTarget.CLASS)internal annotation class Metadata

annotation class Suspendable // Java中使用的是@interface Suspendable

@Retention(RetentionPolicy.RUNTIME)@Metadata(   mv = {1, 1, 7},   bv = {1, 0, 2},   k = 1,   d1 = {"u0000nnu0002u0018u0002nu0002u0010u001bnu0000bu0086u0002u0018u00002u00020u0001Bu0000¨u0006u0002"},   d2 = {"Lcom/easy/kotlin/Suspendable;", "", "production sources for module kotlin_tutorials_main"})public @interface Suspendable {}

interface ImageRepository : PagingAndSortingRepository<image long> {       @Query("SELECT a from #{#entityName} a where a.isDeleted=0 and a.isFavorite=1 and a.category like %:searchText% order by a.gmtModified desc")    fun searchFavorite(@Param("searchText") searchText: String, pageable: Pageable): Page<image>    @Throws(Exception::class)    @Modifying    @Transactional    @Query("update #{#entityName} a set a.isFavorite=1,a.gmtModified=now() where a.id=?1")    fun addFavorite(id: Long)}</image></image>

@Controllerclass MeituController {    @Autowired    lateinit var imageRepository: ImageRepository    @RequestMapping(value = *arrayOf("/", "meituView"), method = arrayOf(RequestMethod.GET))    fun meituView(model: Model, request: HttpServletRequest): ModelAndView {        model.addAttribute("requestURI", request.requestURI)        return ModelAndView("meituView")    }}

enum class Direction {    NORTH, SOUTH, WEST, EAST // 每個枚舉常量都是一個對象, 用逗號分隔}

    public final val name: String    public final val ordinal: Int

>>> val north = Direction.NORTH>>> north.nameNORTH>>> north.ordinal0>>> north is Directiontrue

enum class Color(val rgb: Int) {    RED(0xFF0000),    GREEN(0x00FF00),    BLUE(0x0000FF)}

>>> val c = Color.GREEN>>> cGREEN>>> c.rgb65280>>> c.ordinal1>>> c.nameGREEN

class NestedClassesDemo {    class Outer {        private val zero: Int = 0        val one: Int = 1        class Nested {            fun getTwo() = 2            class Nested1 {                val three = 3                fun getFour() = 4            }        }    }}

    val one = NestedClassesDemo.Outer().one    val two = NestedClassesDemo.Outer.Nested().getTwo()    val three = NestedClassesDemo.Outer.Nested.Nested1().three    val four = NestedClassesDemo.Outer.Nested.Nested1().getFour()

class NestedClassesDemo {class Outer {        private val zero: Int = 0        val one: Int = 1        class Nested {            fun getTwo() = 2            fun AccessOuter() = {                println(zero) // error, cannot access outer class                println(one)  // error, cannot access outer class            }        }}}

package com.easy.kotlinclass NestedClassesDemo {    class Outer {        private val zero: Int = 0        val one: Int = 1        inner class Inner {            fun accessOuter() = {                println(zero) // works                println(one) // works            }        }    }}fun main(args: Array<string>) {    val innerClass = NestedClassesDemo.Outer().Inner().accessOuter()}</string>

class NestedClassesDemo {    class AnonymousInnerClassDemo {        var isRunning = false        fun doRun() {            Thread(object : Runnable { // 匿名內(nèi)部類                override fun run() {                    isRunning = true                    println("doRun : i am running, isRunning = $isRunning")                }            }).start()        }    }}

@functionalInterfacepublic interface Runnable {    public abstract void run();}

            fun doStop() {                var isRunning = true                Thread({                    isRunning = false                    println("doStop: i am not running, isRunning = $isRunning")                }).start()            }            fun doWait() {                var isRunning = true                val wait = Runnable {                    isRunning = false                    println("doWait: i am waiting, isRunning = $isRunning")                }                Thread(wait).start()            }            fun doNotify() {                var isRunning = true                val wait = {                    isRunning = false                    println("doNotify: i notify, isRunning = $isRunning")                }                Thread(wait).start()            }