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Sort employee object in descending order using comparator and TreesSet

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instanceof java

Posts: 576
Nickname: instanceof
Registered: Jan, 2015

instanceof java is a java related one.
Sort employee object in descending order using comparator and TreesSet Posted: Mar 8, 2016 2:11 PM
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This post originated from an RSS feed registered with Java Buzz by instanceof java.
Original Post: Sort employee object in descending order using comparator and TreesSet
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1.Basic Java example program sort student object descending order by id using treeset

  1. package com.TreeSetExamplePrograms;

  3. public Class Employee Implements Comparable<Employee>{ 
  4. String name;
  5.     int id;
  6.     
  7.     public String getName() {
  8.         return name;
  9.     }
  10.  
  11.     public void setName(String name) {
  12.         this.name = name;
  13.     }
  14.  
  15.     public int getId() {
  16.         return id;
  17.     }
  18.  
  19.     public void setId(int id) {
  20.         this.id = id;
  21.     }
  22.  
  23.     Student(String name, int id){
  24.         this.name=name;
  25.         this.id=id;
  26.     }
  27.  
  28.     @Override    public int compareTo(Employee obj) {
  29.         if (this.getId() == obj.getId()) return 0;
  30.         else
  31.         
  32.         if (this.getId() < obj.getId()) return 1;
  33.         else return -1;
  34.             
  35. }
  36.  
  37. }


  1. package com.TreeSetExamplePrograms;

  3. public Class Test{ 
  5. public static void main(String args[]) {
  6. //create TreeSet object
  7.  
  8. TreeSet<Employee> treeSet = new TreeSet<Employee>();     
  9.      
  10.        //add elements to TreeSet
  11.     treeSet.add(new Employee("abc",1));
  12.     treeSet.add(new Employee("xyz",2));
  13.     treeSet.add(new Employee("ssd",3));
  14.     treeSet.add(new Employee("ert",4));
  15.          
  16.     Iterator itr = treeSet.iterator();
  17.  
  18.  while(itr.hasNext()){
  19.  
  20.      Employee obj= (Employee)itr.next();
  21.      System.out.println(obj.getName()+"  "+obj.getId()); 

  23.   }         

  25. }
  26. }

Output:

  1. ert  4
  2. ssd  3
  3. xyz  2
  4. abc  1 

Read: Sort employee object in descending order using comparator and TreesSet

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