Core Java Program Set 2

Program 11: SortDemo.java
//Bubble Sort in Java

public class SortDemo
{ 
    public static void main(String[] args)
          { 
                   int arr[] ={3,60,35,2,45,320,5}; 
                   int n = arr.length;
                  
                   System.out.println("Array Before Sort"); 
                   for(int i=0; i < n; i++)
                   { 
                             System.out.print(arr[i] + " "); 
                   } 
                   System.out.println(); 
                              
        int temp = 0; 
                   for(int i=0; i < n; i++){ 
                             for(int j=1; j < (n-i); j++)
                             { 
                                      if(arr[j-1] > arr[j]){ 
                                                //swap elements 
                                                temp = arr[j-1]; 
                                                arr[j-1] = arr[j]; 
                                                arr[j] = temp; 
                                      }                                                          
                             } 
                   }
                    
                   System.out.println("Array After Sort"); 
                   for(int i=0; i < n; i++){ 
                                      System.out.print(arr[i] + " "); 
                   } 
          } 
}


Program 12: PrimeExample.java
//Prime Number Program in Java

import java.util.Scanner;
public class PrimeExample
{
          public static void main(String args[])
          {   
                   int i,n,flag=0;     
                  
                   Scanner sc=new Scanner(System.in);
                   System.out.println("Enter number you want to check:");
        n=sc.nextInt();
                                     
                   if(n==0||n==1)
                   { 
                             System.out.println(n+" is not prime number");     
                   }
                   else
                   { 
                             for(i=2;i<n;i++)
                             {     
                                      if(n%i==0)
                                      {     
                                                System.out.println(n+" is not prime number");     
                                                flag=1;     
                                                break;     
                                      }      
                             }     
                             if(flag==0) 
                             {
                                      System.out.println(n+" is prime number");
                             } 
                   }//end of else 
          }   
}


Program 13: MyDateTime.java

import java.util.Date;

public class MyDateTime
{    
    public static void main(String a[])
          {
        Date d = new Date();
        System.out.println("Todays Date is: "+d);
        System.out.println("Current Date: "+d.getDate());
        System.out.println("Current Day: "+d.getDay());
        System.out.println("Current Year: "+d.getYear());
        System.out.println("Current Hours: "+d.getHours());
        System.out.println("Current Minutes: "+d.getMinutes());
        System.out.println("Current Seconds: "+d.getSeconds());
                  
        long millis = System.currentTimeMillis();
        System.out.println("Current time in millis: "+millis);
                  
                   d = new Date(millis);
        System.out.println(d);
                  
                   Date current = new Date();
       
                   //create a date one day after current date
        long nextDay = System.currentTimeMillis() + 1000*60*60*24;
        //create date object
        Date next = new Date(nextDay);
       
                   long prevDay = System.currentTimeMillis() - 1000*60*60*24;
        //create date object
        Date prev = new Date(prevDay);
                  
                   System.out.println("current date is :" + current);
                   System.out.println("prev date is :" + prev);
                   System.out.println("next date is :" + next);
                  
                   //compare both dates
        if(next.after(current)){
            System.out.println("The date is future day");
        } else {
            System.out.println("The date is older than current day");
        }
                                     
        //compare both dates
        if(prev.before(current)){
            System.out.println("The date is older than current day");
        } else {
            System.out.println("The date is future day");
        }
    }
}


Program 14: StringDemo.java
public class StringDemo
{
          public static void main(String[] args)
    {
        String str = "Java String";
                   System.out.println("Original String = " + str);
        // Get the character at positions 0 and 10.
                   int index1 = str.charAt(0);
                   int index2 = str.charAt(5);

        // Print out the results.
                   System.out.println("The character at position 0 is " + (char)index1);
                   System.out.println("The character at position 5 is " + (char)index2);
                  
                   System.out.println("The string length of '"+str+"' is: "+str.length());
                   System.out.println("String in lowercase: " + str.toLowerCase());
                   System.out.println("String in uppercase: " + str.toUpperCase());
                  
                   String substr = str.substring(5, 11);
                   System.out.println("The sub string is: "+ substr);
                  
                   String str1 = "This is Exercise 1";
        String str2 = "This is Exercise 2";
                  
                   // Concatenate the two strings together.
        String str3 = str1.concat(str2);

        // Display the new String.
                   System.out.println("The concatenated string: " + str3);
                  
                   // Compare the two strings.
                   int result = str1.compareTo(str2);

                   // Display the results of the comparison.
                   if (result < 0)
                   {
                             System.out.println("\"" + str1 + "\"" + " is less than " +
                                                          "\"" + str2 + "\"");         
                   }
                   else if (result == 0)
                   {
                   System.out.println("\"" + str1 + "\"" + " is equal to " +
                                                          "\"" + str2 + "\"");
                   }
                   else // if (result > 0)
                   {
                             System.out.println("\"" + str1 + "\"" + " is greater than " +
                                                          "\"" + str2 + "\"");
                   }
                                                         
                   String inputValue = "   Matrumandir ";
                   System.out.println(inputValue);
                   // removing the white spaces
                   String newValue = inputValue.trim();                 
                   System.out.println(newValue);
    }
}

Program 15: StrBufDemo.java

public class StrBufDemo
{
          public static void main(String[] args)
          {
                   StringBuffer sb1 = new StringBuffer("Hello Java World");
                   System.out.println(sb1);
                   sb1.delete(6, 11);
                   System.out.println("Delete method demo: " + sb1);
                  
                   sb1.insert(5, " Hi");
                   System.out.println("Inser Operation: "+sb1);
                  
                  
                   sb1.replace(6, 8, "My");
                   System.out.println("Replace Operation: "+sb1);
                  
                   StringBuffer sb4 = new StringBuffer("ABCDE");
                   System.out.println("Reverse of ABCDE: "+ sb4.reverse());
                  
                   sb4.setCharAt(3, 'x');
                   System.out.println("Replacing char at index 3: "+ sb4);
          }
}

Program 16: VectorDemo.java

import java.util.*;

public class VectorDemo
{

    public static void main(String a[])
          {
        Vector v1 = new Vector();
       
                   //adding elements to the end
                   v1.add("23.52");
        v1.add("48.75");
        v1.add("44.44");
        v1.add("First");
        v1.add("Second");
        v1.add("Third");
                   v1.add("1");
        v1.add("2");
        v1.add("3");
        System.out.println(v1);
        //adding element at specified index
        v1.add(2,"Random");
        System.out.println(v1);
        //getting elements by index
        System.out.println("Element at index 3 is: "+v1.get(3));
        //getting first element
        System.out.println("The first element of this vector is: "+v1.firstElement());
        //getting last element
        System.out.println("The last element of this vector is: "+v1.lastElement());
        //how to check vector is empty or not
        System.out.println("Is this vector empty? "+v1.isEmpty());
                   System.out.println("Vector Size:"+v1.size());
                  
                   System.out.println("Display Vector using Iterator");
                   Iterator itr = v1.iterator();
        while(itr.hasNext()){
            System.out.println(itr.next());
                   }
                  
                   System.out.println("Display Vector using Enumeration");
                   Enumeration enm = v1.elements();
        while(enm.hasMoreElements()){
            System.out.println(enm.nextElement());
                   }
                  
                   v1.clear();
        System.out.println("After clear vector:"+v1);
                   System.out.println("Is this vector empty? "+v1.isEmpty());
                  
       
    }
}

Program 17: HashtableDemo.java

import java.util.*;
public class HashtableDemo
{
    public static void main(String a[])
          {
        //Create hashtable instance
        Hashtable ht = new Hashtable();
        //add key-value pair to hashtable
        ht.put("one", "1 INSERTED");
        ht.put("two", "2 INSERTED");
        ht.put("three","2 INSERTED");
        System.out.println(ht);
        //getting value for the given key from hashtable
        System.out.println("Value of key 'two': "+ht.get("two"));
        System.out.println("Is Hashtable empty? "+ht.isEmpty());
        ht.remove("three");
        System.out.println(ht);
        System.out.println("Size of the Hashtable: "+ht.size());
                  
                  
        if(ht.containsKey("one")){
            System.out.println("The Hashtable contains key one");
        } else {
            System.out.println("The Hashtable does not contains key one");
        }
                  
                   if(ht.containsValue("one")){
            System.out.println("The Hashtable contains value one");
        } else {
            System.out.println("The Hashtable does not contains value one");
        }                                     
    }
} 
    

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