Get Size of Java TreeSet Example

Posted by: Instanceofjava Posted date: 3:45 PM / 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: 3:27 PM / 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: 3:07 PM / 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: 12:45 PM / 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
 

Java Example program to calculate area of reactangle

Posted by: Instanceofjava Posted date: 12:17 PM / comment : 0 ,

In this tutorial we will see how to calculate Area of Rectangle.

1.Write a Basic java example  program to find area of Rectangle

  •  To calculate the area of rectangle we need to ask user to enter length and width of the rectangle so that we can calculate area of rectangle using formula area of rectangle=length*width



  1. package com.BasicJavaProgramsExamples;
  2. import java.util.Scanner;
  3. public Class AreaOfRectangle{ 
  5.  
  6. public static void main(String args[]) {
  7.  
  8. Scanner in= new Scanner(System.in);
  9. System.out.println("Please enter length of a rectangle");
  10.  
  11.     double length=in.nextDouble();
  12.      
  13. System.out.println("Please enter width of a rectangle");
  14.  
  15.     double width=in.nextDouble();
  16.  
  17. /*
  18.  *Area of a rectangle is
  19.  *Area= length*width;
  20.  *
  21.  */
  22.          
  23.     double area=length*width;
  24.       
  25.     System.out.println("Area of the Rectangle="+area);
  26.  
  27. }
  28. }

Output:
  1. Please enter length of a rectangle
  2. 4
  3. Please enter width of a rectangle
  4. 8
  5. Area of the circle =32.0




2.Write a Basic java example program to find Area of rectangle without user interaction
 

  1. package com.BasicJavaProgramsExamples;
  3. public Class AreaOfRectangle{ 
  5.  
  6. public static void main(String args[]) {
  7.  
  8.  
  9.   double length=4;
  10.      
  11.   double width=8;
  12.  
  13. /*
  14.  *Area of a rectangle is
  15.  *Area= length*width;
  16.  *
  17.  */
  18.          
  19.     double area=length*width;
  20.       
  21.     System.out.println("Area of the Rectangle="+area);
  22.  
  23. }
  24. }

Output:
  1. Area of the circle =32.0
1.Write a Basic java example  program to find perimeter of Rectangle

  •  To calculate the perimeter of rectangle we need to ask user to enter length and width of the rectangle so that we can calculate perimeter of rectangle using formula perimeter of rectangle=2*length*width



  1. package com.BasicJavaProgramsExamples;
  2. import java.util.Scanner;
  3. public Class PerimeterOfRectangle{ 
  5.  
  6. public static void main(String args[]) {
  7.  
  8. Scanner in= new Scanner(System.in);
  9. System.out.println("Please enter length of a rectangle");
  10.  
  11.     double length=in.nextDouble();
  12.      
  13. System.out.println("Please enter width of a rectangle");
  14.  
  15.     double width=in.nextDouble();
  16.  
  17. /*
  18.  *perimeter of a rectangle is
  19.  *perimeter= length*width;
  20.  *
  21.  */
  22.          
  23.     double perimeter=length*width;
  24.       
  25.     System.out.println("Perimeter of the Rectangle="+perimeter);
  26.  
  27. }
  28. }

Output:
  1. Please enter length of a rectangle
  2. 4
  3. Please enter width of a rectangle
  4. 8
  5. Perimeter of the circle =64.0

Basic Java program to find area and perimeter of circle

Posted by: Instanceofjava Posted date: 12:00 PM / comment : 0 ,

1.Write a Basic java example  program to find area of circle

  •  To calculate the area of circle we need to ask user to enter radius of the circle so that we can calculate area of circle using formula area of circle =PI* radius * radius



  1. package com.BasicJavaProgramsExamples;
  2. import java.util.Scanner;
  3. public Class AreaOfCirle{ 
  5.  
  6. public static void main(String args[]) {
  7.  
  8. int radius = 0;
  9. Scanner in= new Scanner(System.in);
  10. System.out.println("Please enter radius of a circle");
  11.  
  12.     radius=in.nextInt();
  13.      
  14. /*
  15.  * where r is a radius of a circle then Area of a circle is
  16.  *Area= pi * r * r
  17.  *
  18.  */
  19.          
  20.     double area=Math.PI* radius * radius;
  21.       
  22.     System.out.println("Area of the circle ="+area);
  23.  
  24. }
  25. }

Output:
  1. Please enter radius of a circle
  2. 23
  3. Area of the circle =1661.9025137490005




2.Write a Basic java example program to find perimeter of circle

  •  To calculate the perimeter  of circle we need to ask user to enter radius of the circle so that we can calculate perimeter  of circle using formula area of circle =2* PI* radius
  
  1. package com.BasicJavaProgramsExamples;
  2. import java.util.Scanner;
  3. public Class PerimeterOfCirle{ 
  5.  
  6. public static void main(String args[]) {
  7.  
  8. int radius = 0;
  9. Scanner in= new Scanner(System.in);
  10. System.out.println("Please enter radius of a circle");
  11.  
  12.     radius=in.nextInt();
  13.      
  14. /*
  15.  * where r is a radius of a circle then perimeter of a circle is
  16.  *Area= pi * r * r
  17.  *
  18.  */
  19.          
  20.     double perimeter =2* Math.PI* radius;
  21.  
  22.     System.out.println("Perimeter of the circle ="+perimeter );
  23.  
  24. }
  25. }

Output:
  1. Please enter radius of a circle
  2. 12
  3. Perimeter of the circle =75.39822368615503

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