Java Sem6 Programs

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 Java Sem-6 Programs:




//Write a java program to accept names of ‘n’ cities, insert same into array list
//collection and display the contents of same array list, also remove all these elements

import java.util.ArrayList;
import java.util.Scanner;

public class S2Ass1A1 {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        ArrayList a = new ArrayList();

        System.out.println("Enter the no. of cities:");
        int n = sc.nextInt();
        String s[] = new String[n];

        for(int i=0; i<n; i++)
        {
           s[i] = sc.next();
           a.add(s[i]);

        }
        System.out.println("Displaying ArrayList:"+a);
        a.clear();
        System.out.println("After Removing ArrayList:"+a);
    }
}

/*
OUTPUT:
Enter the no. of cities:
5
pune
baramti
patas
supe
mumbai
Displaying ArrayList:[pune, baramti, patas, supe, mumbai]
After Removing ArrayList:[]
 */



//Write a java program to read ‘n’ names of your friends, store it into linked list, also
//display contents of the same

import java.util.LinkedList;
import java.util.Scanner;

public class S2Ass1A2 {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        LinkedList l = new LinkedList();

        System.out.println("Enter the no. of friends:");
        int n = sc.nextInt();

        String s[] = new String[n];

        System.out.println("Enter the "+n+" names of your friends:");
        for (int i=0; i<n; i++)
        {
           s[i] = sc.next();
           l.add(s[i]);
        }

        System.out.println(l);
    }
}

/*
OUTPUT:
Enter the no. of friends:
5
Enter the 5 names of your friends:
swapnil
raju
om
saurabh
ritik
[swapnil, raju, om, saurabh, ritik]

 */



//Write a program to create a new tree set, add some colors (string) and print out the
//tree set

import java.util.TreeSet;

public class S2Ass1Q3 {
    public static void main(String[] args) {
        TreeSet<String> t = new TreeSet<String>();
        t.add("Pink");
        t.add("Blue");
        t.add("red");
        t.add("green");
        t.add("black");
        t.add("Yellow");

        System.out.println(t);

    }
}

/*
OUTPUT:
[Blue, Pink, Yellow, black, green, red]
 */



//) Create the hash table that will maintain the mobile number and student name. Display
//the contact list.

import java.util.Hashtable;

public class S2Ass1Q4 {
    public static void main(String[] args) {
        Hashtable h = new Hashtable();
        h.put("swapnil",123);
        h.put("om",345);
        h.put("siri",987);
        h.put("alexa",324);

        System.out.println(h);
    }
}

/*
OUTPUT:
{om=345, siri=987, swapnil=123, alexa=324}
 */



// Accept ‘n’ integers from the user. Store and display integers in sorted order having
//proper collection class. The collection should not accept duplicate elements

import java.util.Scanner;
import java.util.TreeSet;

public class S2Ass1B1 {
    public static void main(String[] args) {
        TreeSet t = new TreeSet();
        Scanner sc = new Scanner(System.in);

        System.out.println("Enter the no. of Integers:");
        int n = sc.nextInt();

        System.out.println("Enter the Integers:");
        for (int i=0; i<n; i++)
        {
            t.add(sc.nextInt());
        }

        System.out.println(t);
    }
}

/*
OUTPUT:
Enter the no. of Integers:
5
Enter the Integers:
4
3
8
5
1
[1, 3, 4, 5, 8]
 */



//Write a program to sort HashMap by keys and display the details before sorting and
//after sorting.

import java.util.HashMap;
import java.util.Iterator;
import java.util.Map.Entry;
import java.util.TreeMap;

public class S2Ass1B2 {
    public static void main(String[] args) {
        HashMap h = new HashMap();
        h.put(5,"swapnil");
        h.put(1,"seri");
        h.put(88,"alexa");
        h.put(101,"hena");
        h.put(2,"messi");
        h.put(3,"otis");

        System.out.println("Before Sorting HashMap is:");
        Iterator itr = h.keySet().iterator();
        while(itr.hasNext())
        {
            int key = (int)itr.next();
            System.out.println(key+" = "+h.get(key));
        }

        System.out.println("After Sorting HashMap is:");
        TreeMap t = new TreeMap(h);
        Iterator itr1 = t.keySet().iterator();
        while(itr1.hasNext())
        {
            int key = (int)itr1.next();
            System.out.println(key+" = "+h.get(key));
        }

    }
}
/*OUTPTU:
Before Sorting HashMap is:
1 = seri
2 = messi
3 = otis
5 = swapnil
101 = hena
88 = alexa

After Sorting HashMap is:
1 = seri
2 = messi
3 = otis
5 = swapnil
88 = alexa
101 = hena
 */



import java.io.FileReader;
import java.io.IOException;
import java.util.Hashtable;
import java.util.Scanner;

public class S2Ass1B3 {
    public static void main(String[] args) throws IOException
    {
        FileReader fr = new FileReader("fname.txt");
        Scanner sc = new Scanner(fr);
        Hashtable h = new Hashtable();

        while(sc.hasNextLine())
        {
            String name = sc.next();
            Integer phno = sc.nextInt();
            h.put(name,phno);
        }

        System.out.println(h);



    }
}


/* OUTPUT:
PS C:\Users\swapniljamble\IdeaProjects\MyProject\src> javac S2Ass1B3.java
Note: S2Ass1B3.java uses unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
PS C:\Users\swapniljamble\IdeaProjects\MyProject\src> java S2Ass1B3      
{anu=2348, nil=23487, avi=23048, swapnil=298374, omu=238947}

 */


/*  Create a java application to store city names and their STD codes using an
appropriate collection. The GUI should allow the following operations:
i. Add a new city and its code (No duplicates)
ii. Remove a city from the collection
iii. Search for a city name and display the code

 */


import java.awt.*;
        import java.awt.event.*;
        import javax.swing.*;
        import java.util.*;


public class S2Ass1C1 extends JFrame implements ActionListener
{
    JTextField t1,t2,t3;
    JButton b1,b2,b3;
    JTextArea t;
    JPanel p1,p2;

    Hashtable ts;
    S2Ass1C1()
    {
        ts=new Hashtable();
        t1=new JTextField(10);
        t2=new JTextField(10);
        t3=new JTextField(10);

        b1=new JButton("Add");
        b2=new JButton("Search");
        b3=new JButton("Remove");

        t=new JTextArea(20,20);
        p1=new JPanel();
        p1.add(t);

        p2= new JPanel();
        p2.setLayout(new GridLayout(2,3));
        p2.add(t1);
        p2.add(t2);
        p2.add(b1);
        p2.add(t3);
        p2.add(b2);
        p2.add(b3);

        add(p1);
        add(p2);

        b1.addActionListener(this);
        b2.addActionListener(this);
        b3.addActionListener(this);

        setLayout(new FlowLayout());
        setSize(500,500);
        setVisible(true);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);


    }
    public void actionPerformed(ActionEvent e)
    {
        if(b1==e.getSource())
        {
            String name = t1.getText();
            int code = Integer.parseInt(t2.getText());
            ts.put(name,code);
            Enumeration k=ts.keys();
            Enumeration v=ts.elements();
            String msg="";
            while(k.hasMoreElements())
            {
                msg=msg+k.nextElement()+" = "+v.nextElement()+"\n";
            }
            t.setText(msg);
            t1.setText("");
            t2.setText("");
        }
        else if(b2==e.getSource())
        {
            String name = t3.getText();

            if(ts.containsKey(name))
            {
                t.setText(ts.get(name).toString());
            }

            else
                JOptionPane.showMessageDialog(null,"City not found ...");
        }
        else if(b3==e.getSource())
        {
            String name = t3.getText();

            if(ts.containsKey(name))
            {
                ts.remove(name);
                JOptionPane.showMessageDialog(null,"City Deleted ...");
            }

            else
                JOptionPane.showMessageDialog(null,"City not found ...");
        }
    }
    public static void main(String a[])
    {
        new S2Ass1C1();
    }
}


/* Write a program to create link list of integer objects. Do the following:
i. add element at first position
ii. delete last element
iii. display the size of link list
 */

import java.util.LinkedList;

public class S2Ass1C2 {

    public static void main(String[] args) {
        LinkedList l = new LinkedList();
        l.addFirst(5);
        l.add(9);
        l.add(53);
        l.add(34);
        l.add(3);
        l.add(93);
        l.addLast(66);
        System.out.println(l);
        l.addFirst(88);
        System.out.println("After Adding element in first position:"+l);
        l.removeLast();
        System.out.println("After removing last element in link list:"+l);
        System.out.println("The size of given Linked list is: "+l.size());

    }
}

/* OUTPUT:
[5, 9, 53, 34, 3, 93, 66]
After Adding element in first position:[88, 5, 9, 53, 34, 3, 93, 66]
After removing last element in link list:[88, 5, 9, 53, 34, 3, 93]
The size of given Linked list is: 7
 */







Assignment 2




class A extends Thread
{
    public void run()
    {
        for(int i=1;i<=10;i++)
        {
            System.out.println("COVID19...."+i);
        }
    }
}

class B extends Thread
{
    public void run()
    {
        for(int i=1;i<=20;i++)
        {
            System.out.println("LOCKDOWN2020...."+i);
        }
    }
}


class C extends Thread
{
    public void run()
    {
        for(int i=1;i<=30;i++)
        {
            System.out.println("VACCINATED2021...."+i);
        }
    }
}

public class S2Ass2A1 {

    public static void main(String args[])
    {
        A obj=new A();
        obj.start();

        B obj1=new B();
        obj1.start();

        C obj2=new C();
        obj2.start();
    }
}

/* OUTPUT:
COVID19....1
COVID19....2
COVID19....3
COVID19....4
COVID19....5
COVID19....6
COVID19....7
LOCKDOWN2020....1
LOCKDOWN2020....2
LOCKDOWN2020....3
LOCKDOWN2020....4
LOCKDOWN2020....5
LOCKDOWN2020....6
LOCKDOWN2020....7
LOCKDOWN2020....8
LOCKDOWN2020....9
LOCKDOWN2020....10
LOCKDOWN2020....11
LOCKDOWN2020....12
LOCKDOWN2020....13
LOCKDOWN2020....14
LOCKDOWN2020....15
LOCKDOWN2020....16
LOCKDOWN2020....17
LOCKDOWN2020....18
LOCKDOWN2020....19
LOCKDOWN2020....20
VACCINATED2021....1
VACCINATED2021....2
VACCINATED2021....3
VACCINATED2021....4
VACCINATED2021....5
COVID19....8
VACCINATED2021....6
COVID19....9
VACCINATED2021....7
COVID19....10
VACCINATED2021....8
VACCINATED2021....9
VACCINATED2021....10
VACCINATED2021....11
VACCINATED2021....12
VACCINATED2021....13
VACCINATED2021....14
VACCINATED2021....15
VACCINATED2021....16
VACCINATED2021....17
VACCINATED2021....18
VACCINATED2021....19
VACCINATED2021....20
VACCINATED2021....21
VACCINATED2021....22
VACCINATED2021....23
VACCINATED2021....24
VACCINATED2021....25
VACCINATED2021....26
VACCINATED2021....27
VACCINATED2021....28
VACCINATED2021....29
VACCINATED2021....30

 */












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