Question

我在组织员工名单时遇到了麻烦。我只需要根据他们的员工类型（前两个字母）来组织它们。每个对象都以员工代码开头，这是前两个字母。这是我需要分离位置类型但由于某种原因我无法抓住它们。

这是我创建对象并将其存储在数组中的文件。

PW_1234，James，Bond，01/02 / 10,1,10 PW_1235，John，Brown，02/03 / 10,2,10.5 PW_1236，霍华德，约翰逊03/04 / 10,3,11 PW_1237，弗朗西斯，Themule，04/05 / 11,4,10.75 PW_1238，马修，刘易斯，05/06 / 11,1,12.75 PW_1239，马克，Bixton，05/13 / 11,2,13 PW_1242，Sarah，Glover，05/14 / 11,1,13.75 PW_1245，John，Doe，05/15 / 11,4,10.5 PW_1245，玛丽，能源部，05/15 / 11,4,10.5 TL_1248，阿贝尔，英语，05/16 / 11,3,16.5,0.01,100,89 TL_1251，Eustis的，克劳泽，05/17 / 11,2,16,0.02,100,9 SU_1254，亨利，Hollowman，05/18 / 11,1,40000,0.01 PW_1240，Luke，Sailor，01/22 / 12,3,14.5 PW_1243，Jane，Baker，01/23 / 12,2,14 PW_1243，简，贝克，01/23 / 12,2,14 TL_1246，大卫，简要，01/24 / 12,1,14.75,0.01,100,57 PW_1246，大卫，Doson，01/24 / 12,1,14.75 TL_1249，贝克，安德森，01/25 / 12,4,11.5,0.01,100,100 TL_1252，弗兰克，DONSON，1月26日/ 12,3,17.5,0.02,100,39 SU_1255，艾萨克阿西莫夫，1月27日/ 12,2,43000,0.02 SU_1256，伊萨克，Shoreman，01/28 / 12,3,39000,0.01 SU_1257，伊萨克，罗伯茨，1月29日/ 12,4,35500,0.01 PW_1241，John，Candy，11/23 / 13,4,9.5 PW_1244，Kate，Smith，11/24 / 13,3,15.5 PW_1244，凯特，手柄11/24 / 13,3,15.5 TL_1247，塞穆尔，Dempky 11/25 / 13,2,15,0.01,100,10 TL_1250，查理，博曼，26分之11/ 13,1,15.75,0.01,100,50 TL_1253，乔治，Fritzmen，27分之11/ 13,4,12.5,0.02,100,27

以下是代码：

private String makeEmployeeList()
{
    String list = "";

    for(int i=0; i < employees.length; i++)
    {
        list += "\n"+employees[i].toString();
        if(employees[i]substring(0,2).equals("SU"))
        {
            list += "\n"+employees[i].toString();
        }
    }
    return list;
}

**以下是employees数组的创建方式：

private Employee[] employees;

**以下是所有内容的加载方式。

public void loadEmployeesFromFile(String fileName)
            {
               File inFile = new File(fileName);
               if(inFile.exists())  //  MAKE SURE FILE EXISTS
               {    
                   try
                   {
                       BufferedReader inReader = new BufferedReader(new FileReader(inFile));
                      inReader.mark(32000);
                       String inLine = inReader.readLine();

                       //************************************
                       //  Counting rows to set array size
                       //************************************

                       int rowCount = 0;
                       while (inLine != null  && !inLine.equals(""))
                       {
                            rowCount++;
                           inLine = inReader.readLine();
                       }
                       inReader.reset();

                       //*******************
                       // re-reading data 
                       //*******************
                       this.employees = new Employee[rowCount];

                       for(int rowIndex = 0;rowIndex < rowCount; rowIndex++)
                       {
                            inLine = inReader.readLine();
                            Scanner employeeScanner = new Scanner(inLine).useDelimiter(",");
                            String workerType = employeeScanner.next();
                            String firstName = employeeScanner.next();
                            String lastName = employeeScanner.next();
                            String hireDate = employeeScanner.next();
                            int shift = employeeScanner.nextInt();

                            if(workerType.substring(0,2).equals("PW"))
                            {
                                double pay = employeeScanner.nextDouble();  
                                employees[rowIndex]= new ProductionWorker(workerType, firstName, lastName, hireDate, shift, pay);      
                            } 
                            else if(workerType.substring(0,2).equals("TL"))
                            {
                                double pay = employeeScanner.nextDouble();
                                double bonusRate = employeeScanner.nextDouble();
                                int reqHours = employeeScanner.nextInt();
                                int recHours = employeeScanner.nextInt();
                                employees[rowIndex]= new TeamLeader(workerType, firstName, lastName, hireDate, shift, pay, bonusRate, reqHours, recHours);      
                            } 
                            else if(workerType.substring(0,2).equals("SU"))
                            {
                                double salary = employeeScanner.nextDouble();
                                double bonusRate = employeeScanner.nextDouble();
                                employees[rowIndex]= new ShiftSupervisor(workerType, firstName, lastName, hireDate, shift, salary, bonusRate ); 
                            } 
                       }
                       return;
                   }catch(IOException ioe)
                   {
                       System.err.print("\nTrouble reading employee file: "+fileName);
                   }
               }
               JOptionPane.showMessageDialog(null, "\nFile Name does not exist!\n Process terminating!");
               System.exit(0);
            }

Answer 1

private String makeEmployeeList(){ 
StringBuilder sbSU = null;

for(int i=0; i < employees.length; i++)
{
    sbSU = new StringBuilder();
    if(employees[i].substring(0,2).equals("SU"))
    {
        sbSU.append(employees[i].toString());
    }
}
return sbSU.toString();
}

首先，你在emplyees [i]改编后错过了一个点由于string是一个不可变对象，我建议你使用StringBuilder及其append方法而不是+ =。并使用其toString（）方法将StringBuilder转换为String。您还需要覆盖Employees的toString方法。

要对数组中的员工进行排序，您需要实现Comparable或Comparator接口，以便Array在排序员工时知道要使用哪些条件，在您的情况下是比较员工的类型

Answer 2

当您使用JOptionPane时，您可以使用内部的html来为其提供格式。创建一个Employee类并按类型进行自然顺序，或者如果您不想使用Comparable

，则可以使用Comparator

我为你做了一个完整的例子。

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

import javax.swing.JOptionPane;

public class Employee implements Comparable<Employee> {
    private String type;
    private String name;

    public Employee(String type, String name) {
        super();
        this.type = type;
        this.name = name;
    }

    public String getType() {
        return type;
    }

    public void setType(String type) {
        this.type = type;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    @Override
    public int hashCode() {
        final int prime = 31;
        int result = 1;
        result = prime * result + ((name == null) ? 0 : name.hashCode());
        result = prime * result + ((type == null) ? 0 : type.hashCode());
        return result;
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj)
            return true;
        if (obj == null)
            return false;
        if (getClass() != obj.getClass())
            return false;
        Employee other = (Employee) obj;
        if (name == null) {
            if (other.name != null)
                return false;
        } else if (!name.equals(other.name))
            return false;
        if (type == null) {
            if (other.type != null)
                return false;
        } else if (!type.equals(other.type))
            return false;
        return true;
    }

    public int compareTo(Employee o) {
        if (this.type.equals(o.type)) {
            return name.compareTo(o.name);
        }
        return type.compareTo(o.type);
    }

    public static void main(String[] args) {
        List<Employee> employees = new ArrayList<Employee>();
        employees.add(new Employee("CA","John"));
        employees.add(new Employee("CA", "Suzy"));
        employees.add(new Employee("TA","Malcom"));
        employees.add(new Employee("AA","Rose"));

        // Sort the list by type as its natural order or use proper Comparator
        Collections.sort(employees);

        StringBuilder sb = new StringBuilder();
        sb.append("<html><table><tr><td>Type</td><td>Name</td></tr>");
        for (Employee e : employees) {
            sb.append("<tr>");
            sb.append("<td> ").append(e.getType()).append("</td>");
            sb.append("<td> ").append(e.getName()).append("</td>");
            sb.append("</tr>");
        }
        sb.append("</table></html>");
        JOptionPane.showMessageDialog(null, sb);
  }
}

输出：

enter image description here

组织JAVA对象的数组列表

2 个答案: