从布尔方法返回字符串

我有下面的类图。

我需要输出一个类似于“ James，Sid（1234）：导演为£100000.0（含税£29822.0）且有资格获得奖金的toString ”

但是我找不到一种方法可以打印出返回的部分，无论雇员是否有资格获得奖金。

任何帮助深表感谢！

这是我尝试创建类的尝试。

package org.com1027.formative.ye00036;

public class Employee {
    //Class Field(s)
    private int id = 0;
    private String forename = null;
    private String surname = null;
    private Salary salary = null;
    private CompanyPosition companyPosition = null;

    //Parameterised constructor using all fields, allowing creation of objects
    public Employee(int id, String forename, String surname, Salary salary, CompanyPosition companyPosition) {
        super();
        this.id = id;
        this.forename = forename;
        this.surname = surname;
        this.salary = salary;
        this.companyPosition = companyPosition;
    }

    //Getters-Accessors
    //Returns the employee's ID
    public int getId() {
        return id;
    }
    //Returns the employee's Forename
    public String getForename() {
        return forename;
    }
    //Returns the employee's Surname
    public String getSurname() {
        return surname;
    }
    //Returns the employee's Salary
    public Salary getSalary() {
        return salary;
    }
    //Returns the employee's Company Position
    public CompanyPosition getPositionName() {
        return companyPosition;
    }
    //Checks if an employee is eligible for bonus
    public boolean eligibleForBonus(){
        if (salary.getSalary() >= 40000) 
            return true;
        else 
            return false;
    }

    @Override
    public String toString() {
        return getForename() + ", " + getSurname() + "(" + getId() +
                "): " + getPositionName() + "at " + salary.getSalary() + " (" + salary.calculateTax() + ") and is ";
    }

}