Sort employee object in descending order using comparable and TreesSet

Posted by: Instanceofjava Posted date: March 08, 2016 / comment : 0 ,

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>{ 

  5.     String name;
  6.     int id;
  7.     
  8.     public String getName() {
  9.         return name;
  10.     }
  11.  
  12.     public void setName(String name) {
  13.         this.name = name;
  14.     }
  15.  
  16.     public int getId() {
  17.         return id;
  18.     }
  19.  
  20.     public void setId(int id) {
  21.         this.id = id;
  22.     }
  23.  
  24.     Employee (String name, int id){
  25.         this.name=name;
  26.         this.id=id;
  27.     }
  28.  
  29.     @Override    public int compareTo(Employee obj) {
  30.         if (this.getId() == obj.getId()) return 0;
  31.         else
  32.         
  33.         if (this.getId() < obj.getId()) return 1;
  34.         else return -1;
  35.             
  36. }
  37.  
  38. }



  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 

Get lowest and highest value stored in Java TreeSet example

Posted by: Instanceofjava Posted date: March 08, 2016 / comment : 0 ,

1.Basic Java example program get lowest and highest values from treeset

  1. package com.TreeSetExamplePrograms;

  3. public Class TreeSetGetLowestAndHighestDemo{ 
  5.  
  6. public static void main(String args[]) {
  7. //create TreeSet object
  8.  
  9.  
  10.  TreeSet<Integer> treeSet = new TreeSet<Integer>();
  11.        
  12.  //add elements to TreeSet
  13.   treeSet.add(1);
  14.   treeSet.add(3);
  15.   treeSet.add(2);
  16.   treeSet.add(5);
  17.   treeSet.add(6);
  18.   treeSet.add(7);
  19.   treeSet.add(8);
  20.   treeSet.add(9);
  21.   treeSet.add(10);
  22.           
  23.  System.out.println(treeSet);
  24.           
  25.  System.out.println("First element in treeset : " + treeSet.first());           
  26.    
  27.  System.out.println("Last element in treeste" + treeSet.last()); 


  30. }
  31. }


Output:


  1. [1, 2, 3, 4, 5, 6, 7, 8, 9,10]
  2. First element in treeset :1
  3. Last element in treeset :10
2.Basic Java example program print elements of treeset using iterator


  1. package com.TreeSetExamplePrograms;

  3. public Class TreeSetDemo{ 
  5.  
  6. public static void main(String args[]) {
  7. //create TreeSet object
  8.  
  9.  TreeSet<String> treeSet = new TreeSet<String>();
  10.  
  11.    //add elements to TreeSet
  12.     treeSet.add("I");
  13.     treeSet.add("N");
  14.     treeSet.add("S");
  15.     treeSet.add("T");
  16.     treeSet.add("A");
  17.     treeSet.add("N");
  18.     treeSet.add("C");
  19.     treeSet.add("E");
  20.           
  21.     treeSet.add("O");
  22.     treeSet.add("F");
  23.   
  24. Iterator itr = treeSet.iterator();
  25. while(itr.hasNext()){
  26.              System.out.println(itr.next());
  27. }

  29. }
  30. }




Output:

  1. A
  2. C
  3. E
  4. F
  5. I
  6. N
  7. O
  8. S
  9. T

Get Size of Java TreeSet Example

Posted by: Instanceofjava Posted date: March 08, 2016 / comment : 0 ,

1.Basic Java example program get size of treeset


  1. package com.TreeSetExamplePrograms;

  3. public Class TreeSetGetSizeDemo{ 
  5.  
  6. public static void main(String args[]) {
  7. //create TreeSet object
  8.  
  9.  TreeSet<String> treeSet = new TreeSet<String>();
  10.  
  11.    //add elements to TreeSet
  12.     treeSet.add("I");
  13.     treeSet.add("N");
  14.     treeSet.add("S");
  15.     treeSet.add("T");
  16.     treeSet.add("A");
  17.     treeSet.add("N");
  18.     treeSet.add("C");
  19.     treeSet.add("E");
  20.           
  21.     treeSet.add("O");
  22.     treeSet.add("F");
  23.           
  24.     System.out.println(treeSet);
  25.           
  26.    System.out.println("Size of TreeSet  : " + treeSet.size());           
  27.     //remove one element from TreeSet using remove method
  28.  
  29.      treeSet.remove("A");
  30.  
  31.  System.out.println("Size of TreeSet after removal of element A : " + treeSet.size()); 
  32.  System.out.println(treeSet);

  34. }
  35. }



Output:


  1. [A, C, E, F, I, N, O, S, T]
  2. Size of TreeSet  : 9
  3. Size of TreeSet after removal of element A : 8
  4. [C, E, F, I, N, O, S, T]

Java Program to convert Treesrt to an interger array

Posted by: Instanceofjava Posted date: March 08, 2016 / comment : 0 ,

1.Basic Java program to copy all elements of treeset to an array


  1. package com.TreeSetExamplePrograms;

  3. public Class TreeSetDemo{ 
  5.  
  6. public static void main(String args[]) {
  7. //create TreeSet object
  8.  TreeSet<Integer> treeSet = new TreeSet<Integer>();
  9.        
  10.  //add elements to TreeSet
  11.   treeSet.add(1);
  12.   treeSet.add(3);
  13.   treeSet.add(2);
  14.   treeSet.add(5);
  15.   treeSet.add(6);
  16.   treeSet.add(7);
  17.   treeSet.add(8);
  18.   treeSet.add(9);
  19.   treeSet.add(10);
  20.         
  21.    Object[] objArray = treeSet.toArray();
  22.      //display contents of Object array
  23.  
  24.    System.out.println("TreeSet elements are copied into an Array. Now Array Contains..");
  25.  
  26.   for(int index=0; index < objArray.length ; index++)
  27.       System.out.println(objArray[index]);
  28.          
  29. }
  30. }


Output:


  1. TreeSet elements are copied into an Array. Now Array Contains..
  2. 1
  3. 2
  4. 3
  5. 5
  6. 6
  7. 7
  8. 8
  9. 9
  10. 10

 2.Java example program to Convert treeset to integer array

Copy all elements of Java TreeSet to an Object Array

Check if a particular value exists in Java TreeSet example

Posted by: Instanceofjava Posted date: March 08, 2016 / comment : 0

1.Basic Java program to check particular value present in TreeSet or not?

  1. package com.TreeSetExamplePrograms;

  3. public Class TreeSetDemo{ 
  5.  
  6. public static void main(String args[]) {
  7. //create TreeSet object
  8.  TreeSet<String> treeSet = new TreeSet<String>();
  9.        
  10.  //add elements to TreeSet
  11.   treeSet.add("1");
  12.   treeSet.add("3");
  13.   treeSet.add("2");
  14.   treeSet.add("5");
  15.   treeSet.add("6");
  16.   treeSet.add("7");
  17.   treeSet.add("8");
  18.   treeSet.add("9");
  19.   treeSet.add("10");
  20.         
  21.  boolean isExists = treeSet.contains("5");
  22.  System.out.println("5 exists in treeSet ?  " + isExists); 

  24. }
  25. }



Output:

  1. 5 exists in treeSet ? :true

1.Basic Java program to add elements ans display all elements



  1. package com.TreeSetExamplePrograms;
  2. import java.util.Scanner;
  3. public Class TreeSetDemo{ 
  5.  
  6. public static void main(String args[]) {
  7. //create TreeSet object
  8.  TreeSet<Integer> treeSet = new TreeSet<Integer>();
  9.        
  10.  //add elements to TreeSet
  11.   treeSet.add(1);
  12.   treeSet.add(3);
  13.   treeSet.add(2);
  14.   treeSet.add(5);
  15.   treeSet.add(6);
  16.   treeSet.add(7);
  17.   treeSet.add(8);
  18.   treeSet.add(9);
  19.   treeSet.add(10);
  20.         

  22.  System.out.println(treeset); 

  24. }
  25. }

Output:

  1. [1, 2, 3, 5, 6, 7, 8, 9, 10]

treeset add elements in java example program

Basic Java Example Program to check even or add

Posted by: Instanceofjava Posted date: March 08, 2016 / comment : 0 ,

1.Basic Java program to check even or add

  1. package com.BasicJavaProgramsExamples;
  2. import java.util.Scanner;
  3. public Class EvenOrOdd{ 
  5.  
  6. public static void main(String args[]) {
  7.  
  8. Scanner in= new Scanner(System.in);
  9. System.out.println("Please enter number to check even or odd");
  10.  
  11.     int n=in.nextInt();
  12.    
  13.          
  14. if(n%2==0){
  15.   System.out.println(+n" is even number");
  16. } else{
  17.  
  18. System.out.println(+n" is even number");
  19.  
  20. }
  21. }
  22. }

Output:

  1. Please enter number to check even or odd
  2. 4
  3. 4 is even number




2.Basic Java program to check even or add from 1 to 10

  1. package com.BasicJavaProgramsExamples;
  2. public Class EvenOrOdd{ 
  4.  
  5. public static void main(String args[]) {
  6.  
  7. for (int a=1; a<=10; a=a++){
  8.  if (a%2==0)
  9.     System.out.println(a+" is even");
  10. else
  11.     System.out.println(a+" is odd");
  12.  
  13. }   
  14. }
  15. }

Output:
  1. 1 is odd
  2. 2 is even
  3. 3 is odd
  4. 4 is even
  5. 5 is odd
  6. 6 is even
  7. 7 is odd
  8. 8 is even
  9. 9 is odd
  10. 10 is even

3.Basic Java program to check even or add from an array

  1. package com.BasicJavaProgramsExamples;
  2. import java.util.Scanner;
  3. public Class EvenOrOdd{ 
  5.  
  6. public static void main(String args[]) {
  7.  
  8. int[] numbers = new int[]{1,2,3,4,5,6,7,8,9,10};
  9.  
  10. for (int a=0; a<=numbers .length; a=a++){
  11.  
  12.  if (numbers[i]%2==0)
  13.     System.out.println(numbers[i]+" is even number");
  14. else
  15.     System.out.println(numbers[i]+" is odd number");
  16.  
  17. }    

  19. }
  20. }

Output:

  1. 1 is odd number
  2. 2 is even number
  3. 3 is odd number
  4. 4 is even number
  5. 5 is odd number
  6. 6 is even number
  7. 7 is odd number
  8. 8 is even number
  9. 9 is odd number
  10. 10 is even number
 
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