java - 如何将 super 赋值给变量？

Question

我想执行以下操作:

public class Sub extends Super {
  public Sub(Super underlying) {
    if (underlying == null) {
      underlying = super; // this line is illegal
    }

    this.underlying = underlying;
  }

  @Override
  public void method() {
    underlying.method();
  }
}

这样的事情怎么办？

Answer 1

你没有正确理解java中的super关键字。请参阅javadoc for super

If your method overrides one of its superclass's methods, you can invoke the overridden method through the use of the keyword super. You can also use super to refer to a hidden field (although hiding fields is discouraged)

此外，super() 用于调用父类构造函数。