HashMap in java

package com.home;

import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;

public class HashMapDemo1 {
   
public static void main(String[] args) {
Map<Integer, String> a = new HashMap<Integer, String>();

a.put(1, "hari");
a.put(2, "Gopal");
a.put(3, "RAm");
a.put(4, "Mohan");
a.put(5, "Daro");

int size = a.size();

System.out.println(size);


a.remove(1);
System.out.println(a);

Set set = a.entrySet();

Iterator it = set.iterator();

while(it.hasNext()){

Map.Entry me = (Map.Entry) it.next();

System.out.println("This is key = "+me.getKey()+" : "+"This is value "+me.getValue());
}
}
}
The Output of the Following Program is:

5
{2=Gopal, 3=RAm, 4=Mohan, 5=Daro}
This is key = 2 : This is value Gopal
This is key = 3 : This is value RAm
This is key = 4 : This is value Mohan
This is key = 5 : This is value Daro

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vector in java

package com.home;

import java.util.Iterator;
import java.util.Vector;

public class VectorDemo {

public static void main(String[] args) {

Vector obj = new Vector();

obj.add(12);
obj.add("ram");
obj.add(1);



//System.out.println(obj);

/* Iterator it = obj.iterator();

while(it.hasNext()){
System.out.println(it.next());
}
*/

for(int i=0;i<obj.size();i++){

System.out.println(obj.get(i));
}

}

}

The Output of the Following Program is:

12

ram

1

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java arraylist

package com.home;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;



public class ArrayLIstDemo {


public static void main(String[] args) {

ArrayList<String> alist = new ArrayList<String>();

alist.add("ram");
alist.add("hari");
alist.add("gopal");
alist.add("barma");




Iterator it = alist.iterator();
while(it.hasNext()){
System.out.println(it.next());

}





}
}

The Output Of the above program is:
ram
hari
gopal
barma

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Java program to find greatest number in array

Java program to find greatest number in array:

package arraydemo;


public class ArrayDemo {

    
    public static void main(String[] args) {
        
        
                
                int numbers[] = new int[]{11,12,13,44,55,66,77,88,99,23};
               
                
                int small = numbers[0];
                int large = numbers[0];
               
                for(int i=1; i< numbers.length; i++)
                {
                        if(numbers[i] > large)
                                large = numbers[i];
                        else if (numbers[i] < small)
                                small = numbers[i];
                       
                }
               
                System.out.println("Largest Number is : " + large);
                System.out.println("Smallest Number is : " + small);
        }
}
OUTPUT:
Largest Number is : 99

Smallest Number is : 11

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Simple Java Program to calculate Restaurant Bill

 Simple Java Program to calculate Restaurant Bill:

package restaurants;

import java.util.Scanner;


public class Restaurants {

    
    public static void main(String[] args) {
        
        Scanner input = new Scanner(System.in);
        boolean quit= false;
        int sum=0;
        int wine=200,cold=20,bear=400,juice=100;
        String order="";
        
        do{
            System.out.println("ITEM"+"\t\tPrice");
            System.out.println("1.Wine"+"\t\t"+"200");
            System.out.println("2.ColdDrink"+"\t"+"20");
            System.out.println("3.Bear"+"\t\t"+"400");
            System.out.println("4.Juice"+"\t\t"+"100");
            System.out.println("5.Quit");
            
            int choice=input.nextInt();
            
            switch(choice){
                case 1:System.out.println("Wine"+"\n");
                        sum=sum+wine;
                        order=order.concat("wine"+"\n");
                        
                    break;
                case 2:
                    System.out.println("ColdDrink");
                    sum=sum+cold;
                    order=order.concat("ColdDrink"+"\n");
                    
                       break;
                case 3:
                    System.out.println("Bear");
                    sum=sum+bear;
                    order=order.concat("Bear"+"\n");
                      break;
                case 4:
                    System.out.println("Juice");
                    sum=sum+juice;
                    order=order.concat("Juice"+"\n");
                    break;
                case 5:
                     quit=true;
                     
                    break;
                default:
                    System.out.println("Wrong input");
            }
        
        }while(!quit);
       
        System.out.println("Your Orders are:\n"+order);
        System.out.println("Your total bill="+sum);
        
         System.out.println("Thank you");
    
        
        
        
    
    }
    
}

OUTPUT:

ITEM Price
1.Wine 200
2.ColdDrink 20
3.Bear 400
4.Juice 100
5.Quit
1
Wine

ITEM Price
1.Wine 200
2.ColdDrink 20
3.Bear 400
4.Juice 100
5.Quit
2
ColdDrink
ITEM Price
1.Wine 200
2.ColdDrink 20
3.Bear 400
4.Juice 100
5.Quit
3
Bear
ITEM Price
1.Wine 200
2.ColdDrink 20
3.Bear 400
4.Juice 100
5.Quit
4
Juice
ITEM Price
1.Wine 200
2.ColdDrink 20
3.Bear 400
4.Juice 100
5.Quit
5
Your Orders are:
wine
ColdDrink
Bear
Juice

Your total bill=720
Thank you

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Java KingKong Program

Java KingKong Program:

package javaapplication16;

public class KingKongDemo {

    public static void main(String[] args) {

        for(int i=1;i<=50;i++){

        

            if(i%3==0){

                System.out.println(i+"King");

            }

            else if(i%5==0){

                System.out.println(i+"kong");

            }

            else if(i%3==0 && i%5==0){

                System.out.println("KingKong");

            }else{

                System.out.println(i);

            }

        }

    }

}

OUTPUT:

1

2

3King

4

5kong

6King

7

8

9King

10kong

11

12King

13

14

15King

16

17

18King

19

20kong

21King

22

23

24King

25kong

26

27King

28

29

30King

31

32

33King

34

35kong

36King

37

38

39King

40kong

41

42King

43

44

45King

46

47

48King

49

50kong

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Relational Operator

Relational Operator:

Operators                             Result

==                                          Equql to

!=                                           Not Equal to

>                                            Greater Than

<                                             Lesser than

>=                                           Greater than or equal to

<=                                           Lesser than or equal to  

package javaapplication16;

public class RelationalOperatorDemo {

    public static void main(String[] args) {

        int a=1;

        int b=2;

        int c=1;

        if(a==c){

            System.out.println(" a is Equal to c"+a);

        }else{

            System.out.println("a is not equal to c");

        }

        

        if(a!=b){

            System.out.println("a is Not Equal to b");

        }

        

        if(a>b){

            System.out.println("a is greater than b");

        }

           if(a<b){

               System.out.println("a is less than b");

           }  

           

           if(a>=b){

               System.out.println("a is greater or eual to b");

           }else{

            System.out.println("a is  not greater or eual to b");

           }

           

           if(a<=b){

               System.out.println("a is greater or equal to b");

           }else{

           System.out.println("a is not greater or equal to b");

           }

    }

}

Output:

 a is Equal to c1

a is Not Equal to b

a is less than b

a is  not greater or eual to b

a is greater or equal to b

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