Java里的static在Kotlin里如何实现

public class StaticTest {
  public static int STATIC_VAR = 0;

  public static void staticMethod(String str){
    System.out.println(str);
  }
}

StaticTest.STATIC_VAR = 10;
StaticTest.staticMethod("hello");

class StaticTest {
  companion object{//伴生对象是可以指定名字的，不过一般都省略掉。
    var STATIC_VAR = 0

    fun staticMethod(str: String?) {
      println(str)
    }
  }
}

StaticTest.STATIC_VAR = 100
StaticTest.staticMethod("hello")

//通过类引用访问
StaticTest.STATIC_VAR = 10; 
StaticTest.staticMethod("hello");

//通过对象引用访问
StaticTest obj = new StaticTest();
obj.STATIC_VAR = 10;
obj.staticMethod("hello");

//使用类引用访问
StaticTest.STATIC_VAR = 100
StaticTest.staticMethod("hello")
  
//不能使用对象引用访问
val obj = StaticTest()
obj.STATIC_VAR = 100 //编译错误
obj.staticMethod("hello") //编译错误

public class StaticTest {
  public static int STATIC_VAR = 0;
  
  static {
    STATIC_VAR = 100;
    System.out.println("in static init");
  }
  
  public static void main(String[] args) {
    System.out.println(StaticTest.STATIC_VAR);
  }
}

class StaticTest {
  companion object{//伴生对象是可以指定名字的，不过一般都省略掉。
    var STATIC_VAR = 0

    init {
      STATIC_VAR = 100
      println("in companion object init")
    }
  }
}

println(StaticTest.STATIC_VAR)

public class StaticTest {
  
  private int out = 0;
  
  class InnerClass{
    public void InnerClassMethod(){
      out = 100; //可以访问外部类的变量
    }
  }

  static class StaticInnerClass{
    public void StaticInnerClassMethod(){
      out = 100; //编译错误，不可以访问外部类的变量
    }
  }
}

class StaticTest {
  var out = 0

  inner class InnerClass{
    fun InnerClassMethod(){
      out = 100 //内部类可以访问外部变量
    }
  }
}

class StaticTest {
  var out = 0

  class InnerClass{
    fun InnerClassMethod(){
      out = 100 //编译错误，嵌套类不可以访问外部变量
    }
  }
}