Java Using Element from a set and user defined objects in TreeSet in Java

How to get highest value element from a set

package com.java2novice.treeset;

import java.util.Comparator;

import java.util.TreeSet;

public class MyHighSalEmp

{

public static void main(String a[])

{   

   TreeSet salComp = new TreeSet(new MySalCompr1());

        salComp.add(new Empl2("Ram",3000));

        salComp.add(new Empl2("John",6000));

        salComp.add(new Empl2("Crish",2000));

        salComp.add(new Empl2("Tom",2400));

        System.out.println("Highest salary emp: "+salComp.last());

    }

}

class MySalCompr1 implements Comparator

{

public int compare(Empl2 e1, Empl2 e2)

{

        if(e1.getSalary() > e2.getSalary())

        {

            return 1;

        }

        else

        {

            return -1;

        }

    }

}

class Empl2
{

    private String name;

    private int salary;

public Empl2(String n, int s)

{

        this.name = n;

        this.salary = s;

    }

  public String getName()

  {

        return name;

    }

   public void setName(String name)

   {

        this.name = name;

    }

    public int getSalary()

    {

        return salary;

    }

    public void setSalary(int salary)

   {

        this.salary = salary;

    }

    public String toString()

    {

        return "Name: "+this.name+"-- Salary: "+this.salary;

    }

}

How to avoid duplicate user defined objects in TreeSet

package com.java2novice.treeset;

import java.util.Comparator;

import java.util.Set;

import java.util.TreeSet;

public class MyUserDuplicates

{

public static void main(String a[])

{

        Set ts = new TreeSet(new EmpComp());

        ts.add(new Emp(201,"John",40000));

        ts.add(new Emp(302,"Krish",44500));

        ts.add(new Emp(146,"Tom",20000));

        ts.add(new Emp(543,"Abdul",10000));

        ts.add(new Emp(12,"Dinesh",50000));

        ts.add(new Emp(146,"Tom",20000));

        for(Emp e:ts)

       {

            System.out.println(e);

        }

    }

}

class EmpComp implements Comparator

 {

  public int compare(Emp e1, Emp e2)

 {

        if(e1.getEmpId() == e2.getEmpId())

          {

            return 0;

        }

         if(e1.getEmpId() < e2.getEmpId())

         {

            return 1;

        }

         else

        {

            return -1;

        }

    }

}

class Emp

{

    private int empId;

    private String empName;

    private int empSal;

 public Emp(int id, String name, int sal)

 {

        this.empId = id;

        this.empName = name;

        this.empSal = sal;

    }

 public int getEmpId()

 {

        return empId;

   }

  public void setEmpId(int empId)

  {

        this.empId = empId;

    }

   public String getEmpName()

  {

        return empName;

    }

   public void setEmpName(String empName)

  {

        this.empName = empName;

    }

     

    public int getEmpSal()

   {

        return empSal;

    }

    public void setEmpSal(int empSal)

   {

        this.empSal = empSal;

    }

    public String toString()

   {

        return empId+" : "+empName+" : "+empSal;

    }

}