JAVA 编程题求助怎么写

Question

求助各位大神，不知道怎么写，希望可以得到帮助。。谢谢各位了。。。

Answer 1

 Employee(){ 
    public void empCount(){ 
        empCount++;
        }
        public void empID(){
        this.empID=this.empCount; 
        } 

        } 
        Employee(String firstName,String lastName) {  
        this.firstName = firstName; 
        this.lastName = lastName; 
        public void empCount(){
        empCount++;
        } public void empID(){ 
        this.empID=this.empCount;
        }
        } 
        public String toString(){ 
        return ""+this.firstName+this.lastName+this.empID; 
        }