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  1. import java.util.*;
  2.  
  3. class Scratch {
  4.   public static void main(String[] args) {
  5.  
  6.     final Set<Employee> eSet = new TreeSet<>();
  7.  
  8.     eSet.add(new Employee(1, "john", 20000));
  9.     eSet.add(new Employee(2, "jim", 10000));
  10.     eSet.add(new Employee(9, "mike", 50000));
  11.     eSet.add(new Employee(3, "jack", 30000));
  12.     eSet.add(new Employee(3, "david", 40000));
  13.     eSet.add(new Employee(9, "liam", 80000));
  14.     eSet.add(new Employee(9, "brad", 89000));
  15.     eSet.add(new Employee(3, "jason", 85000));
  16.     eSet.add(new Employee(2, "ted", 35000));
  17.  
  18.     for(Employee e: eSet) {
  19.       System.out.println(e);
  20.     }
  21.   }
  22. }
  23.  
  24. class Employee implements Comparable<Employee> {
  25.   int empId;
  26.   String empName;
  27.   double salary;
  28.  
  29.   public Employee(int empId, String empName, double salary) {
  30.     this.empId = empId;
  31.     this.empName = empName;
  32.     this.salary = salary;
  33.   }
  34.  
  35.   @Override
  36.   public int hashCode() {
  37.     return empId;
  38.   }
  39.  
  40.   @Override
  41.   public boolean equals(Object o) {
  42.     if(this == o) return true;
  43.     if(o == null || this.getClass() != o.getClass()) return false;
  44.  
  45.     Employee e = (Employee) o;
  46.     return (this.empId == e.empId);
  47.   }
  48.  
  49.   @Override
  50.   public String toString() {
  51.     return empId + " " + empName + " " + salary;
  52.   }
  53.  
  54.   @Override
  55.   public int compareTo(Employee e) {
  56.     return Integer.compare(empId, e.empId);
  57.   }
  58. }
Success #stdin #stdout 0.18s 55640KB
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stdin
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Standard input is empty
stdout
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1 john 20000.0
2 jim 10000.0
3 jack 30000.0
9 mike 50000.0
https://ideone.com/N2IHag
language:
Java (HotSpot 12)
created:
2 years ago
visibility:
public

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