Source of Employee.java

Structures and functions

public class Employee implements Comparable

  1: //Employee.java

  3: public class Employee implements Comparable<Employee>
  4: {
  5:     private String name;
  6:     private int id;
  7:     private int age;

  9:     public Employee
 10:     (
 11:         String name,
 12:         int id,
 13:         int age
 14:     )
 15:     {
 16:         this.name = name;
 17:         this.id = id;
 18:         this.age = age;
 19:     }

 21:     public String getName()
 22:     {
 23:         return name;
 24:     }

 26:     public int getId()
 27:     {
 28:         return id;
 29:     }

 31:     public int getAge()
 32:     {
 33:         return age;
 34:     }

 36:     public String toString()
 37:     {
 38:         return name + "\t" + id + "\t" + age;
 39:     }

 41:     //To sort by age
 42:     public int compareTo(Employee other)
 43:     {
 44:         return age - other.age;
 45:     }
 46: }
 47: /*
 48:     //To sort by name
 49:     public int compareTo(Employee other)
 50:     {
 51:         return name.compareTo(other.name);
 52:     }

 54:     //To sort by id
 55:     public int compareTo(Employee other)
 56:     {
 57:         return id - other.id;
 58:     }
 59: */
 60: /*
 61:     Note:
 62:     Since Employee implements Comparable<Employee>
 63:     it must provide a definition for the compareTo()
 64:     method. But it can only provide one implementation,
 65:     so we must choose to compare names, ids, or ages,
 66:     since we can only make one kind of comparison in
 67:     this way. At the moment we are comparing ages.
 68: */