@Override is not allowed when implementing interface method

这个错误通常表示你在实现接口方法时使用了 `@Override` 注释，但是这个注释在接口中是不允许的。在接口中，你只能实现方法，不能重写或覆盖方法。

如果你想在实现接口方法时使用 `@Override` 注释，你需要确保该方法在接口中有一个默认实现。在 Java 8 及更高版本中，接口可以包含具有默认实现的方法，这种方法可以在实现接口时重写和覆盖。例如：

public interface MyInterface {
    default void myMethod() {
        System.out.println("This is a default implementation.");
    }
}

public class MyClass implements MyInterface {
    @Override
    public void myMethod() {
        System.out.println("This is my implementation.");
    }
}

在这个例子中，`MyInterface` 包含一个默认实现的 `myMethod` 方法。在 `MyClass` 中，我们使用 `@Override` 注释来重写并覆盖这个方法。

相关问题

The method removeComplaint(Complaint) of type ComplaintDaoImpl must override or implement a supertype method

This error message usually occurs when a method in a subclass is intended to override a method in its superclass or interface, but the method signature (i.e., the method name, parameter types, and return type) does not match exactly with the method in the superclass or interface.

In the case of the method removeComplaint(Complaint) of type ComplaintDaoImpl, it means that this method is supposed to override a method from its superclass or interface, but the method signature is not identical to the method it is supposed to override.

To fix this error, you need to ensure that the method signature of the removeComplaint(Complaint) method in the ComplaintDaoImpl class matches exactly with the method it is supposed to override in its superclass or interface. This includes the method name, parameter types, and return type.

For example, if the removeComplaint(Complaint) method is supposed to override a method in an interface called ComplaintDao, the method signature in the ComplaintDaoImpl class should look like this:

public void removeComplaint(Complaint complaint) {
// implementation code here
}

Note that the method name, parameter type (Complaint), and return type (void) match exactly with the method in the ComplaintDao interface.

By ensuring that the method signature matches exactly with the method it is supposed to override, you can eliminate the "method must override or implement a supertype method" error and ensure that your code functions as intended.

The method findAll() of type ComplaintDaoImpl must override or implement a supertype method

This error occurs when the method `findAll()` in the class `ComplaintDaoImpl` is not properly overriding a method from its parent class or implementing a method from an interface. To fix this error, the method signature should match the signature of the method it is supposed to override or implement, including the return type, parameter types, and method name.

For example, if `ComplaintDaoImpl` implements an interface `ComplaintDao` that has a method `findAll()`, the signature of `findAll()` in `ComplaintDaoImpl` should be:

public List<Complaint> findAll();

If the parent class has a method `findAll()` that `ComplaintDaoImpl` is supposed to override, the signature should match the parent class method:

@Override
public List<Complaint> findAll() {
    // implementation
}