Need help tp check my code

Question

Hi, I have been having too busy with my other project and now running issue with java that I can't seem to get the Search() working even though I could compile and enter data...hopefully your advice will be helpful. Thanks!
Create a user-defined class called Employee with the following characteristics.
Data members whose accessibility should be restricted to members of the immediate class and sub-classes only.
1.     First name
2. Last name
3.     ID
4.     Salary
5.     Grade - single character P, F or C
The following methods should be included in the Employee class
1.     An appropriate constructor that will accept the Employee�s name, Salary and grade as parameters and initialize the data members accordingly. The ID may also be passed as a parameter OR it may be generated automatically. The ID field will be used as the �primary key� and as such no duplication should be allowed.
2.     Accessor and mutator methods that provide accessibility to the data members.
3.     A method that allows the salary of the employee to be increased.
4.     A method that allows the grade of the Employee to be changed.
5.     Override the toString method so details of the Employee may be returned as a String.
EmployeeData.java
import java.io.*;
// Employee class declaration.
class Employees
     protected String first_name;
     protected String last_name;
     protected int id;
     protected double salary;
     protected char grade;
     public Employees(int a_id)
     int id = a_id;
     public Employees()
     // constructor
      public Employees(String first_name, String last_name, int id, double salary, char grade)
     this.first_name = first_name;
     this.last_name = last_name;
     this.salary = salary;
     this.grade = grade;
     this.id = id;
     //Accessor and mutator methods that provide accessibility to the data members.
     public int getid()
          return this.id;
     //accessor
     public double getsalary()
          return this.salary;
     public char getGrade()
          return this.grade;
     //mutator
     public void setSalary(double salary)
          this.salary = salary;
     public void setGrade(char grade)
          this.grade = grade;
     //A method that allows the salary of the employee to be increased.
     public void increaseSalary(double newSalary)
          this.salary = salary + newSalary;
     //A method that allows the grade of the Employee to be changed
     public void changeGrade(char grade)
          this.grade = grade;
     public void display()
          System.out.println("First Name " + first_name);
          System.out.println("Last Name  " + last_name);
          System.out.println("Salary  " + salary);
///////////////////////////////////////////////////////////////////////////////////////////////////////////////Employee.java
import java.io.*;
class EmployeeData extends Employees
     //Override the toString method so details of the Employee may be returned as a String.
     public String toString () {
          String info = super.toString();
          return info = "Name: " + first_name + " " + last_name + "\nID: " + id + "\nSalary: " + salary + "\nGrade: " + grade;
     //The ID field will be used as the �primary key� and as such no duplication should be allowed.
     private Employees database[];
     public int numOfEmployee;
     static BufferedReader input = new BufferedReader(new InputStreamReader(System.in));
     public EmployeeData()
          //numOfEmployee = 0;
          database = new Employees[10];
     public void DisplayEmployee() throws Exception
               int index = search(id);
               if (index!= -1)
                    database[index].display();
     public void RegEvaluation() throws Exception
               System.out.println("Enter Employee Data");
               System.out.print("Enter First name : ");
               String a_first_name = input.readLine();
               System.out.print("Enter Last name : ");
               String a_last_name = input.readLine();
               System.out.print("Enter Employee ID: ");
               int a_id = Integer.parseInt(input.readLine());
               System.out.print("Enter Employee Salary: ");
               double a_salary = Double.parseDouble(input.readLine());
               System.out.print("Enter Employee Grade: ");
               char a_grade = (char)input.read();
               int index = search(id);
               if (index != -1)
                    System.out.println("numOfEmployee " + numOfEmployee);
                    System.out.println("-------------------------------------");
                    database[numOfEmployee] = new Employees(a_first_name, a_last_name, a_id, a_salary, a_grade);
                    System.out.println("Employee Account Created!");
                    System.out.println("-------------------------------------");
                    numOfEmployee++;
     // To check for duplicate ID values
     public int search(int findID) throws Exception
          for(int x = 0; x < numOfEmployee; x++)
               if(database[x].getid() == findID)
                    System.out.println("\nEmployee ID exists");
          }return 0;
///////////////////////////////////////////////////////////////////////////////////////////////////////////////useEmployeeData.java
class useEmployeeData
     public static void main(String args[]) throws Exception
          EmployeeData EmployeeData = new EmployeeData();
          EmployeeData.RegEvaluation();
          EmployeeData.DisplayEmployee();
          EmployeeData EmployeeData2 = new EmployeeData();
          EmployeeData2.RegEvaluation();
          EmployeeData2.DisplayEmployee();
}Message was edited by:
proyb

Answer 1

when I execute the program, it will ask for employee:
first name:
last name:
ID:
salary:
grade:
and on the second run, I was surprise why the first name and last name are on the same line...
first name: last name:
and continue to key in data as require.
Suppose I try to key in same ID number, it did not show an error message and create another object, now there are 2 object with similar keys.
Message was edited by:
proyb