如何使用向量和可比接口

Question

I did

public class Employee implements Comparable <Object> {
    public int compareTo (Object other ){

i did the implementation well (it works fine) and calles it from other class:

import java.util.Vector;

public class Firm {

    private Vector <Employee> employees = new Vector<Employee>();

and using in the same class (Firm) Comperator Vector in function :

public void SortVector(Vector <Comparable> vector) {

and calls it with:

SortEmployeesBy(this.employees); ////Error is here

and in this line the compiler said:

The method SortVector(Vector) in the type Firm is not applicable for the arguments (Vector)"

Note: i required to use only vector and need to use SortVector several times so that i need to use the comparator because i have many vector and other classes like Employee, customer, Artist... tha each has own implementation for Comparable

why is that, and how to fix it?

Answer 1

Try any one

public void SortEmployeesBy(Vector<? extends Comparable<Object>> vector) {..}
public void SortEmployeesBy(Vector<Employee> vector) {...}

instead of using

public void SortEmployeesBy(Vector<Comparable> vector) {...}

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--EDIT--

You can try with Firm class making it parametrized as shown below to make it more generic .

class Firm<T extends Comparable<Object>> {

    private Vector<T> employees = new Vector<T>();

    public void SortEmployeesBy(Vector<T> vector) {...}
}

Firm<Employee> f = new Firm<Employee>();