Java中的循环队列

我在java中实现了一个循环队列，它将接受对象（Employee）作为条目。现在我有了一个方法来编辑特定对象的姓氏，但不知何故，我无法从

CQueue

类访问

Employee

类中找到的姓氏设置器方法，即使我正在导入所有必需的包。代码如下：

//PACKAGES IMPORTED
package linearstructures;
import dataobjects.*;
import linearnodes.*;

public class CQueue{
    Node front, rear, temp;
    boolean full = false;
    String key;

public AnyClass searchKey(String key)
{
    temp = rear.next; // first node

    do
    {
        if (temp.obj.getKey().equals(key))
            return temp.obj;
        temp = temp.next;
    } while (temp != rear.next);

    return null;
}

public AnyClass editObject(String key){
    int choice, newSeqNo;
    double newPay;
    boolean exit = false;
    Employee etemp = new Employee(); //INCLUDED THIS AFTER EDIT
    searchKey(key);

    if(searchKey(key) != null){
        temp.obj.getData();
        System.out.println();
        System.out.println("------------------------");
        System.out.print("Enter new Salary: ");
        newPay = sc.nextDouble();
        System.out.println("------------------------");
        System.out.println();
        etemp.setPay(newPay); //INCLUDED THIS AFTER EDIT
    else
        System.out.println("NO OBJECT WAS FOUND!");
    return null;
}
}

员工

类别：

package dataobjects;

public class Employee extends AnyClass
{
public String surname;
public double pay;

public Employee(){}

public Employee(int seqNo, String surname, double pay)
{
    super(seqNo);
    this.surname = surname;
    this.pay = pay;
}

public double getSalary()
{
    return pay;
}

public void setPay(double newPay)
{
    pay = newPay;
}

public String getData()
{
    return super.getData() + ", Surname: " + surname + ", Pay: " + pay;
}

public String getKey()
{
    return surname;
}
}

package dataobjects;

public class AnyClass
{
public int seqNo;

public AnyClass(){}

public AnyClass(int seqNo)
{
    this.seqNo = seqNo;
}

public int getseqNo()
{
    return seqNo;
}

public void setseqNo(int seqNo) {
    this.seqNo = seqNo;
}

public String getData()
{

    return "Sequential Number - " + seqNo;
}

public String getKey()
{
    return Integer.toString(seqNo);     
}

public void edit(){}
}

AnyClass

class:

package dataobjects;

public class Employee extends AnyClass
{
public String surname;
public double pay;

public Employee(){}

public Employee(int seqNo, String surname, double pay)
{
    super(seqNo);
    this.surname = surname;
    this.pay = pay;
}

public double getSalary()
{
    return pay;
}

public void setPay(double newPay)
{
    pay = newPay;
}

public String getData()
{
    return super.getData() + ", Surname: " + surname + ", Pay: " + pay;
}

public String getKey()
{
    return surname;
}
}

package dataobjects;

public class AnyClass
{
public int seqNo;

public AnyClass(){}

public AnyClass(int seqNo)
{
    this.seqNo = seqNo;
}

public int getseqNo()
{
    return seqNo;
}

public void setseqNo(int seqNo) {
    this.seqNo = seqNo;
}

public String getData()
{

    return "Sequential Number - " + seqNo;
}

public String getKey()
{
    return Integer.toString(seqNo);     
}

public void edit(){}
}

节点

类 对于include pay“etemp.setPay（newPay）；”，您将把返回对象更改为Employee

public Employee editObject(String key){

Employee etemp = new Employee(); //INCLUDED THIS AFTER EDIT
....
....
etemp.setPay(newPay); //INCLUDED THIS AFTER EDIT
return etemp;
}

---

因为AnyClass没有“公共双倍支付；”

您的

editobject

方法可能是这样的：

public AnyClass editObject(String key){
    // ...

    // Store your search result to avoid performing searchKey twice
    AnyClass searchResult = searchKey(key);

    if( searchResult != null ){
        // Check if searchResult is an Employee object
        if( searchResult instanceof Employee )
            // Cast AnyClass to Employee
            Employee empl = (Employee) searchResult;

            // Your logic here...

            // Set properties of the Employee object
            empl.setPay(newPay);

            // ...

           return empl;
        }
        // Add 'else if' here, if you need to manage other Object types
        // otherwise you can join previous if conditions 
    }
    else
        System.out.println("NO OBJECT WAS FOUND!");
    return null;
}

---

您的代码创建了一个新的本地

Employee

实例，该实例在方法结束时死亡，其值将丢失，因为没有对象指向它。

什么是CQueue？这个的代码在哪里？@dbrown93它的代码是第一段代码。我只包括了相关的方法（搜索和编辑）和一些声明。它是实现循环队列的类。您所说的“问题”是什么意思？是否存在编译器错误或引发异常？@dbrown93表示

setPay（）

方法不存在。问题是它正在查看

AnyClass

但是

setPay（）

位于

Employee

类中。我的问题是如何访问该类。您通过employee对象访问setPay方法，如果临时节点中的“obj”不是employee，编译器将不知道该方法在哪里