array

import java.util.Arrays;

import java.util.InputMismatchException;

import java.util.List;

import java.util.Scanner;

public class ArraysExample {

       public static void main(String []args)

       {

              int[] nums = {17, 90, 21, 78, 12, 36, 93, 23, 43, 120, 125,64};

              System.out.println("Before Sorting ");

              System.out.println(Arrays.toString(nums));

              Arrays.sort(nums);

              System.out.println("After Sorting ");

              System.out.println(Arrays.toString(nums));

              System.out.print("Enter a value to perform the binary search in the array : ");

              Scanner in = new Scanner(System.in);

              try

              {

                     int position = Arrays.binarySearch(nums, in.nextInt());

                     if(position >= 0)

                     {

                     System.out.println("The entered value found at the position " +  position);

                     }

                     else

                     {

                           System.out.println("The entered value doesn't exists in the array");

                     }

              }

              catch (InputMismatchException e) {

                     System.out.println("Entered value is not a number");

              }

              List<String> list = Arrays.asList("C", "C++", "Java", ".Net", "PHP", "JavaScript", "HTML");

              for(String language : list)

              {

                     System.out.println(language);

              }

              System.out.println(Arrays.toString(Arrays.copyOf(nums, 30)));

       }

}

scanner with hashmap

import java.util.*;

import java.util.Map.Entry;

public class ExampleWithScannerAndHashMap {

                public static void main(String[] args) {

                                int count = 0;// stores the number of names

                                // Scanner the reads the user input from standard input stream

                                Scanner in = new Scanner(System.in);

                                // Request user input till getting a valid number

                                System.out.println("Enter the Number of Names U wants to display :");

                                while (true) {

                                                try {

                                                                // Read the user input and convert into integer

                                                                count = in.nextInt();

                                                                // If it is a valid number break the loop

                                                                break;

                                                } catch (InputMismatchException e) {

                                                                // If it is not a valid number show the error msg

                                                                System.out.println("Please enter a valid number : ");

                                                }

                                }

                                in.nextLine(); // reads the enter char from buffer

                                // Hashmap to store the names

                                Map<String, String> hashMap = new HashMap<String, String>();

                                for (int i = 1; i <= count; i++) {

                                                System.out.println("Enter Name " + i + " : ");

                                                // Add the names to hashmap with different keys

                                                hashMap.put("name" + i, in.nextLine());

                                }

                                // Print the names in the hashmap

                                printValues(hashMap);

                                System.out.println("Enter a key to delete : ");

                                String key = in.nextLine();

                                if (hashMap.containsKey(key)) {

                                                hashMap.remove(key);

                                                System.out.println("The element with key " + key

                                                                                + " has been removed successfully");

                                } else {

                                                System.out.println("The entered key does not exists");

                                }

                                //Clears the hashmap

                                hashMap.clear();

                                // close the scanner to release the resource

                                in.close();

                }

                public static void printValues(Map<String, String> hashMap) {

                                Iterator<Entry<String, String>> iterator = hashMap.entrySet()

                                                                .iterator();

                                System.out.println("There are " + hashMap.size() + " elements in HashMap. They are ");

                                System.out.println("Key : Value");

                                while (iterator.hasNext()) {

                                                Entry<String,String> entry = iterator.next();

                                                System.out.println(entry.getKey() + " : "

                                                                                + entry.getValue());

                                }

                }

}