Hello my good people, this is my first Java program ever and I ran into an issue I don't know how to fix, even after a bunch of research. So I'm trying to override the compareTo method, so I can sort a list of objects by name, but when I put that list into Collections.sort, it shows an error saying "no instance(s) of type variable(s) T exist so that MyClass conforms to Comparable<? super T>" Here's the relevant code, I can post more if you want:

Comparable interface:

 public interface Comparable<Jed> {
     int compareTo(Jed jed);
 }

Class Jed, that implements Comparable:

public class Jed implements Comparable<Jed> {
    String ime;
    
    @Override
    public int compareTo(Jed jed){
        return this.ime.compareTo(jed.getIme());
    }
}

The class which holds the list that I want sorted:

public class Racun {
    private List<Jed> seznamJedi;
    
    public void sort(){
        Collections.sort(seznamJedi);
    }    

I hope I didn't miss anything relevant, but yeah, any help would be greatly appreciated and maybe an explanation on why this is happening.

i don't know if i should write it as compareTO(Object UNP) or compareTo(RentalCars UNP) also am i using the equals() method correctly or am i missing something?

/*
Class Car(implements the interface: Comparable<> )
- Attributes:
o Unique number plate (final) : String
o Brand: String
o Rental rate: double
o Extra three (from your choice)
- Methods:
o Constructors: zero-arg and multi-arg
o getters
o setters (if needed)
o toString()
o equals(): compare plate numbers
o compareTo(): compare plate numbers
 */
import java.io.*;
import java.util.*;
// i know i should change it from Rentalcars to RentalCar
public class RentalCars implements Comparable<RentalCars> {
//UNP is the unique plat numbers
  final String UNP;
  private String brandName;
  private double rentalRates;
  private int wheelDrive;
  private String color;
  private int milage;
  
  
  
public RentalCars(){
      this(null,null, 0.0, 0, null, 0);
  }
public RentalCars(String UNP, String brandName, double rentalRates, int wheelDrive,
   String color, int milage){
    
      this.UNP = UNP;
      this.brandName=brandName;
      this.rentalRates=rental_Rates;
      this.wheelDrive=wheel_Drive;
      this.color=color;
      this.milage=milage;
  }
public String getUNP() {
    return UNP;
    }
public String getbrandName() {
     return brandName;
    }
public void setbrandname(String brandName) {
    this.brandName=brandName;
    }
public double getrentalRates() {
    return rentalRates;
    }
public void setrental_Rates(double rentalRates) {
    this.rentalRates=rentalRates; 
    } 
public int getwheelDrive() {
    return wheelDrive;
    }
public void setwheel_Drive(int wheelDrive) {
    this.wheelDrive=wheelDrive; 
    }
public String getcolor() {
    return color;
    }
public void setcolor(String color) {
    this.color=color; 
    }
public int getmilage() {
    return milage;
    }
public void setmilage(int milage) {
    this.milage=milage; 
    }

@Override
public String toString()
{
    return "the Number Plate of the car is "+UNP+"the Car brand is "+brandName+
            "the rent rate of this car is "+rental_Rates+"the wheel drive is "+
            wheel_Drive+"the color of the car is "+color+"the milage is "+milage;
 }
public boolean equals(RentalCars obj){
    RentalCars rc = (RentalCars) obj;
    if(UNP != rc.UNP)
        return false;
    
    return true;
 }
  public int compareTo(RentalCars UNP){
  
  }
}