Commonly asked program in the Interview

Commonly asked program in the Interview

1)Write a program to sort a array?

  package sort;

import java.util.Scanner;

public class Sortarray 

{

public static void main(String args[])

{

int n, temp;

Scanner s = new Scanner(System.in);  

System.out.println("Enter no of the elements:");

n =s.nextInt();                                                      //getting input from the user 

int a[] = new int[n];

System.out.println("Enter all the elements:");

for(int i=0; i<n;i++)

{

a[i]=s.nextInt();

}

for(int i=0;i<n;i++)

{

for(int j=i+1; j<n; j++)                             //passing and assigning the values

{

if(a[i]>a[j])

{

temp =a[i];

a[i]=a[j];

a[j]=temp;

}

}

}

System.out.println("Ascending order");

for(int i=0; i<n-1; i++)

{

System.out.println(a[i]+",");

}

System.out.println(a[n-1]);

}

}


2) Program for Arraylist and Linkedlist and HashSet

          import java.util.*;

public class Array{

   public static void main(String[] args) {
      //ArrayList 
      List a1 = new ArrayList();
      a1.add("Zara");
      a1.add("Mahnaz");
      a1.add("Ayan");
      System.out.println(" ArrayList Elements");
      System.out.print("\t" + a1);

      //LinkedList
      List l1 = new LinkedList();
      l1.add("Zara");
      l1.add("Mahnaz");
      l1.add("Ayan");
      System.out.println();
      System.out.println(" LinkedList Elements");
      System.out.print("\t" + l1);

      //HashSet
      Set s1 = new HashSet(); 
      s1.add("Zara");
      s1.add("Mahnaz");
      s1.add("Ayan");
      System.out.println();
      System.out.println(" Set Elements");
      System.out.print("\t" + s1);

      //HashMap
      Map m1 = new HashMap(); 
      m1.put("Zara", "8");
      m1.put("Mahnaz", "31");
      m1.put("Ayan", "12");
      m1.put("Daisy", "14");
      System.out.println();
      System.out.println(" Map Elements");
      System.out.print("\t" + m1);
   }
}
  

4) Program for the LinkedList ()

    import java.util.*; 

import java.util.Iterator;

public class LinkList

{  

 public static void main(String args[])

 {  

   

  LinkedList al=new LinkedList(); 

  LinkedList<String> a2=new LinkedList<String>();

  LinkedList<Character> a3=new LinkedList<Character>();

  

  

  al.add("Ravi");  

  al.add("Vijay");  

  al.add("Ravi");  

  al.add("Ajay"); 

  /*al.add(10);

  al.add(15);

  al.add(10);

  al.add(56);

  al.add("e");  */

  al.get(2);

  al.set(2, "hashed");

  System.out.println(al  );

  Iterator it = al.iterator();

 // it = al.iterator();

  while(it.hasNext()) 

  {

      Object element = it.next();

      System.out.print(element + " ");

  }

  //System.out.println(it.previous());

  

  System.out.println(" ");

 }

}

  

5)Program for to find a Largest  file in Java?

    import java.io.BufferedReader;

class Largestfile
{
 public static void main(String args[])
 {
  findMethod("My name is H GANESHKUMAR");
 }
 static public void findMethod(String s)
 {
  String str = s + " ";
  char ch = ' ';
  int len = str.length(), l = 0;
  int min = len, max = 0;
  String shortest_word = "", longest_word = "", word = "";
  for (int i = 0; i < len; i++)
  {
   ch = str.charAt(i);
   if (ch != ' ')
   {
    word += ch;
   }                                     //if ends
   else
   {
    l = word.length();
    if (l < min)
   
    {
     min = l;
     shortest_word = word;
    }                                     //if ends
    if (l > max)
    {
     max = l;
     longest_word = word;
    }
    word = "";
   }
  }
  System.out.println("Shortest word = " + shortest_word + " with length " + min);
  System.out.println("Longest word = " + longest_word + " with length " + max);
 }
}