java - 找不到符号 Java

Question

我正在为我的类(class)做一个练习，我在编码过程中偶然发现了一个问题。我应该创建一个扩展类，我认为我遇到的问题是我为构造函数提供的参数。

这是直接父类(super class):

public class ElectricalComponent extends Component 
{ 
  private int myMinRating, 
              myMaxRating; 
      
  public ElectricalComponent( String partNumber, int versionNumber, int minRating, int maxRating ) 
  { 
    super( "Electrical", partNumber, versionNumber ); 
    myMinRating = minRating; 
    myMaxRating = maxRating; 
  } 

  public int getMinRating() { return myMinRating; } 
  public int getMaxRating() { return myMaxRating; } 
}

这是我正在学习的类(class):

public class HighvoltageComponent extends ElectricalComponent
{
  private int myMinRating, myMaxRating;

  public HighvoltageComponent( String partNumber, int versionNumber)
  {
    super( "Electrical", partNumber, versionNumber );
    myMinRating = 50000;
    myMaxRating = 200000;
  }

}

我的问题出在子类中:“HighVoltageComponent ( String ... )”

当我运行主类时

public static void main( String[] args )
{
  // test your code here
  Component a = new HighvoltageComponent( "HV12", 0 );

  System.out.println( a.toString() );
  System.out.println( a.getTypeName() );
  System.out.println( a.getPartNumber() );
  System.out.println( a.getVersionNumber() );
}

我收到错误消息

"HighvoltageComponent.java:9: cannot find symbol

symbol : constructor ElectricalComponent(java.lang.String,java.lang.String,int) "

为什么会发生这种情况？

另外，您能告诉我我做这个问题的方法是否正确吗？这是问题:

A HighvoltageComponent is an ElectricalComponent with a minimum rating of 50000 and a maximum rating of 200000. Complete the following definition of HighvoltageComponent. (You will need to insert code at more than one place in the code area below.)

谢谢，罗汉

Answer 1

ElectricalComponent 构造函数需要四个参数，您在 HighVoltageComponent 中的调用 super( "Electrical", partNumber, versionNumber ); 中仅传递了三个参数类

你的 super 调用应该是这样的

super( partNumber, versionNumber,myMinRating ,myMaxRating );