相关疑难解决方法(0)

假设我有一个实现Runnable接口的抽象Base类.

public abstract class Base implements Runnable {

  protected int param;

  public Base(final int param) {
      System.out.println("Base constructor");
      this.param = param;
      // I'm using this param here
      new Thread(this).start();
      System.out.println("Derivative thread created with param " + param);
  }

  @Override
  abstract public void run();
}

这是一些衍生类.

public class Derivative extends Base {

  public Derivative(final int param) {
      super(param);
  }

  @Override
  public void run() {
      System.out.println("Derivative is running with param " + param);
  }

  public static void main(String[] args) {
      Derivative thread …

我正在尝试覆盖类中的值。我有以下代码：

open class Balloon() {
    open var textSize: Float = 20f
    init {
        Log.i("textSize", textSize.toString())
    }
}
    
class BigBalloon(): Balloon() {
    override var textSize = 30f
}

但是，日志会打印出这些值：

第一个日志来自Balloon()，第二个来自BigBalloon()。0.0当我将其覆盖为 时，它如何打印30？我是否错误地实施了所有这些？