Regarding hashcode() and Equals()

I have a POJO that contains hashcode() and equals() method that I have overridden , but my query is that what about If i make hashcode() method comment then in collection lets say in a hashmap when I am storing the user defined objects then what impact would it have...and another thing is that if I make equals method as a comment then what Impact would it have If I try to enter duplicate records will it store duplicate records twice!

public class Employee {
 
  String name,job;
  int salary;
 
  public Employee(String n , String j, int t )
  {
      this.name= n;
      this.job=j;
      this.salary= t;         
  }
 
 /* @Override
 public int hashCode() {
     final int prime = 31;
     int result = 1;
     result = prime * result + ((job == null) ? 0 : job.hashCode());
     result = prime * result + ((name == null) ? 0 : name.hashCode());
     result = prime * result + salary;
     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 (job == null) {
         if (other.job != null)
             return false;
     } else if (!job.equals(other.job))
         return false;
     if (name == null) {
         if (other.name != null)
             return false;
     } else if (!name.equals(other.name))
         return false;
     if (salary != other.salary)
         return false;
     return true;
 }
  */
 
  @Override
  public int hashCode()
      {       
      return name.hashCode()+job.hashCode()+salary;       
 
  }
 
  @Override
     public boolean equals(Object obj) {  
      if (this == obj)  
     {  
         return true;   
     }  
     // make sure o can be cast to this class  
     if (obj == null || obj.getClass() != getClass())  
     {  
         // cannot cast  
         return false;  
     }           
 
      Employee e = (Employee) obj;   
      return this.name.equals(e.name)&&this.job.equals(e.job)&&this.salary==e.salary;
  }
 
  @Override
  public String toString() {
         return name+"\t" +"\t"+  job +"\t"+ salary;
     }
 }
 

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