DevOps与敏捷开发Kotlin Class - Powered by Discuz! Archiver

曂沅仴駦 发表于 2024-7-11 12:59:13

Kotlin Class

平凡 Class

kotlin
class TestClz {
val name: String = "hsw"
val age: Int = 18
}
java
public final class TestClz {
@NotNull
private final String name = "hsw";
private final int age = 18;

@NotNull
public final String getName() {
   return this.name;
}

public final int getAge() {
   return this.age;
}
}
转换为Java后的厘革

[*]类被 final 修饰，不可继承；加上open 可以去掉 final
[*]var修饰的属性添加了get set 方法， val 只有·get 方法
data class

kotlin
data class TestClz(val name: String, var age: Int)
java
public final class TestClz {
@NotNull
private final String name;
private int age;

@NotNull
public final String getName() {
   return this.name;
}

public final int getAge() {
   return this.age;
}

public final void setAge(int var1) {
   this.age = var1;
}

public TestClz(@NotNull String name, int age) {
   Intrinsics.checkNotNullParameter(name, "name");
   super();
   this.name = name;
   this.age = age;
}

@NotNull
public final String component1() {
   return this.name;
}

public final int component2() {
   return this.age;
}

@NotNull
public final TestClz copy(@NotNull String name, int age) {
   Intrinsics.checkNotNullParameter(name, "name");
   return new TestClz(name, age);
}

// $FF: synthetic method
public static TestClz copy$default(TestClz var0, String var1, int var2, int var3, Object var4) {
   if ((var3 & 1) != 0) {
      var1 = var0.name;
   }

   if ((var3 & 2) != 0) {
      var2 = var0.age;
   }

   return var0.copy(var1, var2);
}

@NotNull
public String toString() {
   return "TestClz(name=" + this.name + ", age=" + this.age + ")";
}

public int hashCode() {
   String var10000 = this.name;
   return (var10000 != null ? var10000.hashCode() : 0) * 31 + Integer.hashCode(this.age);
}

public boolean equals(@Nullable Object var1) {
   if (this != var1) {
      if (var1 instanceof TestClz) {
         TestClz var2 = (TestClz)var1;
         if (Intrinsics.areEqual(this.name, var2.name) && this.age == var2.age) {
            return true;
         }
      }

      return false;
   } else {
      return true;
   }
}
}
转换为Java后的厘革

[*]类被 final 修饰，不可继承；加上open 可以去掉 final
[*]var修饰的属性添加了get set 方法， val 只有·get 方法
[*]实现了 toString equal hashCode 方法
[*]类似于java bean
object

object TestClz {
val name: String = "hsw"
var age: Int = 18
fun getInfo(): String {
   return "${name}-${age}"
}
}
public final class TestClz {
@NotNull
private static final String name;
private static int age;
@NotNull
public static final TestClz INSTANCE;

@NotNull
public final String getName() {
   return name;
}

public final int getAge() {
   return age;
}

public final void setAge(int var1) {
   age = var1;
}

@NotNull
public final String getInfo() {
   return name + '-' + age;
}

private TestClz() {
}

static {
   TestClz var0 = new TestClz();
   INSTANCE = var0;
   name = "hsw";
   age = 18;
}
}
转换为Java后的厘革

[*]类被 final 修饰，不可继承；加上open 可以去掉 final
[*]var修饰的属性添加了get set 方法， val 只有·get 方法
[*]饿汉式实现了单例
[*]java 不可直接调用get set 需要通过INSTANCE , 属性和方法加上@JvmStatic 可以转换为静态属性/方法直接调用
内部类

class TestClz {
val name: String = "hsw"

companion object {

   val grade = 12L

   fun getInfo() {
         println("name-$name")
   }
}

object CCS {
   val grade = 12L

   fun getSome() {
         println("name-$name")
   }
}

class Info {
   val grade = 12L

   fun getSome() {
         println("name-$name")
   }
}

inner class WC {
   val grade = 12L

   fun getSome() {
         println("name-${name}")
   }
}
}
public final class TestClz {
@NotNull
private final String name = "hsw";
private static final long grade = 12L;
@NotNull
public static final Companion Companion = new Companion((DefaultConstructorMarker)null);

@NotNull
public final String getName() {
   return this.name;
}

// companion 伴生对象
// kotlin 可直接访问属性和方法
// java 需要通过 Companion 对象访问
public static final class Companion {
   public final long getGrade() {
      return TestClz.grade;
   }

   public final void getInfo() {

   }

   private Companion() {
   }

   // $FF: synthetic method
   public Companion(DefaultConstructorMarker $constructor_marker) {
      this();
   }
}
// object 相当于通过单例实现静态内部类对象
public static final class CCS {
   private static final long grade;
   @NotNull
   public static final CCS INSTANCE;

   public final long getGrade() {
      return grade;
   }

   public final void getSome() {

   }

   private CCS() {
   }

   static {
      CCS var0 = new CCS();
      INSTANCE = var0;
      grade = 12L;
   }
}

// 普通 class 相当于静态内部类，需要实例化调用方法
public static final class Info {
   private final long grade = 12L;

   public final long getGrade() {
      return this.grade;
   }

   public final void getSome() {

   }
}

// inner class 内部类，可以直接使用外部类的属性和方法
public final class WC {
   private final long grade = 12L;

   public final long getGrade() {
      return this.grade;
   }

   public final void getSome() {
      String var1 = "name-" + TestClz.this.getName();
      System.out.println(var1);
   }
}
)
}

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Kotlin Class