file updated

Author: shinchancode

7 Generic program/Generic_program.java

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+/*AARTI RATHI
+My website - https://aartirathi17.herokuapp.com/ */
+
+/*Problem Statement :
+Implement a generic program using any collection class to count the number of elements in a collection that have a specific property such as even numbers, odd number, prime number and palindromes.  */
+
+----------------------------------------------------------------------------------------------------------------
+
+package assign7 
+import java.util.*; 
+import java.lang.*; 
+import java.io.*; 
+class assign_7 
+{ 
+ static int count = 0; //COUNT VARIABLE 
+ 
+ //FUNCTION TO CHECK PALINDROME 
+ static void check_palindrome(String x) 
+ { 
+   StringBuilder s1 = new StringBuilder(x); 
+   if(x.equals(s1.reverse().toString())) 
+   { 
+     System.out.println(x+" is a Palindrome"); 
+ count += 1; //count the number of palindromes 
+} 
+else 
+{ 
+ System.out.println(x+" is not a Palindrome"); 
+} 
+} 
+ //FUNCTION TO CHECK EVEN OR ODD 
+static void even_odd(int x) 
+{ 
+ if(x % 2 == 0) 
+ { 
+   System.out.println(x+" IS EVEN"); 
+ count += 1; //count the number of even numbers 
+} 
+else 
+{ 
+ System.out.println(x+" IS ODD"); 
+} 
+} 
+ //FUNCION TO CHECK PRIME NUMBER 
+static void prime(int x) 
+{ 
+ boolean flag = false; 
+ for(int i = 2; i <= x/2; ++i) 
+ { 
+   if(x % i == 0) 
+   { 
+     flag = true; 
+     break; 
+   } 
+ } 
+ if (!flag) 
+ { 
+   System.out.println(x + " is a prime number."); 
+ count += 1; //count the number of prime numbers 
+} 
+else 
+{ 
+ System.out.println(x + " is not a prime number."); 
+} 
+} 
+//FUNCTION TO DECIDE WHICH FUNCTION TO CHECK 
+static void check(int ch,int x) 
+{ 
+ switch(ch) 
+ { 
+   case 1: 
+ even_odd(x); //call even_odd fucntion for number x 
+ break; 
+ case 2: 
+ prime(x); //call prime fucntion for number x 
+ break; 
+ default: 
+ System.out.println("ENTER CORRECT OPTION"); 
+} 
+ } //FUNCTION FOR INTEGER ARRAY 
+ static void number_op() 
+ { 
+   int element,n,choice; 
+   
+   Scanner sc = new Scanner(System.in); 
+   
+ //ArrayList from Collection Interface 
+ //Integer type 
+   ArrayList<Integer> nums = new ArrayList<Integer>(); 
+   
+   System.out.println("Enter the number of elements:"); 
+   n = sc.nextInt(); 
+   
+   
+   for(int i=0;i<n;i++) 
+   { 
+     System.out.println("Enter the element:"+(i+1)); 
+     element = sc.nextInt(); 
+ nums.add(element); //Add elements to the ArrayList 
+} 
+System.out.println("Enter the Operation to be performed:"); 
+System.out.println("1. ODD or EVEN?"); 
+System.out.println("2. CHECK PRIME ?"); 
+choice = sc.nextInt(); 
+
+ Iterator itr = nums.iterator(); //Iterator from the COLLECTION interface 
+ count = 0; 
+ while(itr.hasNext()) //Loop till there are elements in the ArrayList 
+ { 
+   
+ check(choice,(int)itr.next()); //call the check function for each element 
+} 
+
+ //Give the Count 
+if(choice == 1) 
+{ 
+ System.out.println("The number of EVEN numbers is: "+ count); 
+ System.out.println("The number of ODD numbers is: "+ (nums.size()-count)); 
+} 
+else 
+{ 
+ System.out.println("The number of PRIME numbers is: "+ count); 
+ System.out.println("The number of Non-PRIME numbers is: "+ (nums.size()-count)); 
+} 
+} 
+ //FUNCTION FOR STRING ARRAY 
+static void string_op() 
+{ 
+ int n; 
+ String word; 
+ 
+ //ArrayList from COLLECTION interface 
+ //String type 
+ ArrayList<String> words = new ArrayList<String>(); 
+ 
+ Scanner sc = new Scanner(System.in); 
+ System.out.println("Enter the number of strings?"); 
+ n = sc.nextInt(); 
+ 
+ for(int i=0;i<n;i++) 
+ { 
+   System.out.println("Enter string: "+(i+1)); 
+   word = sc.next(); 
+ words.add(word); //Add elements to the ArrayList 
+} 
+count = 0; 
+ for(String w:words) //Loop the ArrayList 
+ { 
+   check_palindrome(w); 
+ } 
+ 
+ System.out.println("The number of PALINDROMES is: "+ count); 
+} 
+public static void main(String[] args) 
+{ 
+ Scanner sc = new Scanner(System.in); 
+ int ch; 
+ //Choose the type of List needed 
+ 
+ 
+ do 
+ { 
+   System.out.println("[1] String"); 
+   System.out.println("[2] Integer"); 
+   System.out.println("Choose Type: (enter 0 to exit)"); 
+   ch = sc.nextInt(); 
+   
+   if(ch==1) 
+   { 
+ string_op(); //Calls String arraylist 
+} 
+
+else if(ch == 2) 
+{ 
+ number_op(); //Calls Interger arraylist 
+} 
+else 
+{ 
+ System.out.print("\nINVALID INPUT!!"); 
+} 
+} 
+while(ch!=0); 
+System.out.print("\nOPERATION COMPLETED!!! Thank you :) "); 
+
+} 
+
+}