Java 类型参数不在类型变量的范围内

如何解决Java 类型参数不在类型变量的范围内

我正在尝试创建一个与通用 BST 类具有 has-a 关系的类，它通过读取逗号分隔的文件来构造树。

这是我的代码：

public class PatientSearchTree<ItemType extends Comparable<ItemType>>
{
    BinarySearchTree<ItemType> patients;
    public PatientSearchTree(String fileName) throws IOException
    {      
         BinarySearchTree<String> lines = new BinarySearchTree<String>();
         BufferedReader reader = null;
      try {
             reader = new BufferedReader(new FileReader(fileName));
             patients = new BinarySearchTree<Patient>();
             String line = null;
          while ((line = reader.readLine()) != null)
          {
             line = reader.readLine(); 
             String[] params = line.split(",");
             Patient tempPatient = new Patient(params[0],params[1],params[2],params[3],params[4],params[5],params[6],params[7],params[8],params[9]);
             patients.add(tempPatient);
          }

         } finally {
         reader.close();
      }
    }

还有我的错误：

PatientSearchTree.java:21: error: type argument 
PatientSearchTree.Patient is not within bounds of type-variable ItemType
         patients = new BinarySearchTree<Patient>();
                                         ^
  where ItemType is a type-variable:
ItemType extends Comparable<ItemType> declared in class BinarySearchTree

解决方法

类 Patient 没有实现接口 Comparable<Patient>。