刪除/由用戶請求在Java中

陣列讀取特定元素誰能告訴我什麼是錯我的公務員deleteEmployeeID我公務員readEmployeeID方法。用戶應該能夠刪除或閱讀更多關於他們請求的特定員工ID的信息。我似乎無法找到我的兩種方法有什麼問題。刪除/由用戶請求在Java中

子類

package WorkIDServerStorage; 

public class EmployeeList{ 
    private Employee[] theEmployee; 
    private int arrayEmployee; 

    public EmployeeList(){ 
     theEmployee = new Employee[100]; 
     arrayEmployee = 0; 
    } 

    public EmployeeList(int arraySize){ 
     theEmployee = new Employee[arraySize]; 
     arrayEmployee = 0; 
    } 

    public void setTheEmployee(Employee[] inputTheEmployee){ 
     theEmployee = inputTheEmployee; 
    } 

    public void setArrayEmployee(int inputArrayEmployee){ 
     arrayEmployee = inputArrayEmployee; 
    } 

    public Employee[] getTheEmployee(){ 
     return theEmployee; 
    } 

    public int getArrayEmployee(){ 
     return arrayEmployee; 
    } 

    public Employee addEmployeeID(Employee employeeAdd){ 
     return theEmployee[arrayEmployee++] = employeeAdd; 
    } 

    public Employee deleteEmployeeID(int employeeDelete){   
     for(int i = employeeDelete + 1; i < theEmployee.length; i++){ 
      theEmployee[i-1] = theEmployee[i]; 
     } 
     return null; 
    } 

    public Employee readEmployeeInfo(int employeeRead){ 
     return theEmployee[employeeRead]; 
    } 

    @Override 
    public String toString(){ 
     StringBuilder sb = new StringBuilder(); 
     for(int x = 0; x < arrayEmployee; x++){ 
      sb.append(theEmployee[x].toString()).append("\n"); 
     }return sb.toString(); 
    } 
}

主類

package WorkIDServerStorage; 
import java.util.Scanner; 

public class EmployeeListTest{ 
    public static void main(String[] args){ 
     EmployeeList EmployeeListObject = new EmployeeList(); 
     Scanner input = new Scanner(System.in); 

     System.out.println("► Initiating Employee Information Server Storage ◄"); 
     System.out.println("► Type 'EXIT' at any moment to close the program ◄\n"); 

     for(int x = 1; x < 6; x++){ 
      Employee EmployeeObject = new Employee("Employee " + x, 1234 + x, 15 + x); 
      EmployeeListObject.addEmployeeID(EmployeeObject); 
     } 
     System.out.println(EmployeeListObject); 

     System.out.print("\nType 'ADD' to add a new employee\n"); 
     System.out.print("Type 'DELETE' to delete an employee record\n"); 
     System.out.print("Type 'READ' to read the data of an employee "); 
     String menuOption = input.next(); 

     if(menuOption.equalsIgnoreCase("EXIT")){ 
      EmployeeListObject.toString(); 
     }else if(menuOption.equalsIgnoreCase("ADD")){ 
      System.out.print("\nInsert employee ID: "); 
      String addEmployeeID = input.next(); 
      EmployeeListObject.addEmployeeID(addEmployeeID); 
     }else if(menuOption.equalsIgnoreCase("DELETE")){ 
      System.out.print("\nInsert employee ID: "); 
      String deleteEmployeeID = input.next(); 
      EmployeeListObject.deleteEmployeeID(deleteEmployeeID); 
     }else if(menuOption.equalsIgnoreCase("READ")){ 
      System.out.print("\nInsert employee ID: "); 
      String readEmployeeID = input.next(); 
      EmployeeListObject.readEmployeeInfo(readEmployeeID); 
     }  
    } 
}

來源

2015-10-03 iNoto

它在幹什麼，你想幹什麼？另外，您可能想要閱讀ArrayList。 – blm

deleteEmployeeID應該返回void。它也應該使'arrayEmployee - '。爲什麼你的readEmployee不起作用？你執行它時看到什麼錯誤？ – popiandro

您應該提供一些我們可以運行的代碼來演示問題。 – JVon

主要的問題我明白了，這可能是也可能不是你的問題的原因是在你的主類。觀察用戶何時請求讀取數據的方式，實際上沒有任何事情可以打印到控制檯中。

線

EmployeeListObject.readEmployeeInfo(readEmployeeID);

調用方法

public Employee readEmployeeInfo(int employeeRead){ 
    return theEmployee[employeeRead]; 
}

剛剛返回和Employee對象，但從來沒有任何打印。因此，用戶將永遠不能讀取員工數據。

你的代碼中的另一個問題是@popiandro評論。但是我不認爲這是導致你的程序崩潰的原因。

public Employee deleteEmployeeID(int employeeDelete){   
    for(int i = employeeDelete + 1; i < theEmployee.length; i++){ 
     theEmployee[i-1] = theEmployee[i]; 
    } 
    return null; 
}

此方法將總是返回null，並且在這樣做沒有意義的。將方法設置爲void。

來源

2015-10-03 23:20:34 JVon

刪除/由用戶請求在Java中

回答

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