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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Arithmetic Operators

Arithmetic Operators:

package javaapplication16;


public class ArithemiticOperatorDemo {
    public static void main(String[] args) {
        int a=10;
        int b=5;
        
        int c=a+b;
        int d=a/b;
        int e=a*b;
        int f=a%b;
        
        System.out.println("Arithmetic Operator Operation");
        System.out.println("Addition = "+a);
        System.out.println("Division = "+b);
        System.out.println("Multiplification = "+e);
        System.out.println("Modulus = "+f);
    }
}

OUTPUT:

Arithmetic Operator Operation

Addition = 10

Division = 5

Multiplification = 50

Modulus = 0

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Increment And Decrement Operator

Increment and Decrement Operator:

package javaapplication16;


public class IncrementAndDecrementOPeratorDemo {
    public static void main(String[] args) {
        int a=5;
        int b=3;
        int c;
        int d;
        
        c= ++b;
        d=++a;
        c++;
        
        System.out.println("a = "+a);
        System.out.println("b = "+b);
        System.out.println("c = "+c);
        System.out.println("d= "+d);
    }
}

OUTPUT:

a = 6

b = 4

c = 5

d= 6

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Java Program to add two Matrix

Java Program to add two Matrix:

package javaapplication22;

import java.util.Scanner;

public class AddTwoMatrix {

    public static void main(String[] args) {

       Scanner s = new Scanner(System.in);

       System.out.print("Enter number of rows: ");

       int rows = s.nextInt();

       System.out.print("Enter number of columns: ");

       int cols = s.nextInt();

       int[][] a = new int[rows][cols];

       int[][] b = new int[rows][cols];

       System.out.println("Enter the first matrix");

       for (int i = 0; i < rows; i++) {

           for (int j = 0; j < cols; j++) {

               a[i][j] = s.nextInt();

           }

       }

       System.out.println("Enter the second matrix");

       for (int i = 0; i < rows; i++) {

           for (int j = 0; j < cols; j++) {

               b[i][j] = s.nextInt();

           }

       }

       int[][] c = new int[rows][cols];

       for (int i = 0; i < rows; i++) {

           for (int j = 0; j < cols; j++) {

               c[i][j] = a[i][j] + b[i][j];

           }

       }

       System.out.println("The sum of the two matrices =");

       for (int i = 0; i < rows; i++) {

           for (int j = 0; j < cols; j++) {

               System.out.print(c[i][j] + " ");

           }

           System.out.println();

       }

   }

}

Output:

Enter number of rows: 2

Enter number of columns: 2

Enter the first matrix

1 2

3 4

Enter the second matrix

1 4

3 5

The sum of the two matrices =

2 6 

6 9 

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Java BizzBuzz Program

Java BizzBuzz Program:

package javaapplication22;


public class BizzBuzzDemo {
   
    public static void main(String[] args) {
        for(int i=1;i<=50;i++){
            if(i%3==0){
                System.out.println("Bizz"+i);
            }else if(i%5==0){
                System.out.println("Buzz"+i);
            }else if(i%3==0 && i%5==0){
                System.out.println("BizzBuzz"+i);
            }else{
                System.out.println(i);
            }
       
        }
    }
}

OUTPUT:

1

2

Bizz3

4

Buzz5

Bizz6

7

8

Bizz9

Buzz10

11

Bizz12

13

14

Bizz15

16

17

Bizz18

19

Buzz20

Bizz21

22

23

Bizz24

Buzz25

26

Bizz27

28

29

Bizz30

31

32

Bizz33

34

Buzz35

Bizz36

37

38

Bizz39

Buzz40

41

Bizz42

43

44

Bizz45

46

47

Bizz48

49

Buzz50

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IndexOf() and last indexOf()

Searching Strings:

1)IndexOf() = searches for the first occur of a character 
                           int indexOf(int ch);

2)last indexOf()=searches for the last occur of a character 

                              int lastIndexOf(int ch);

package stringdemo;

public class IndexOfAndlastIndexOfDemo {

    

    public static void main(String[] args) {

        String s="I am a bad guy";

        

        System.out.println(s);

        System.out.println("indexOf(a)"+s.indexOf('a'));

        System.out.println("lastindexOf(g)"+s.lastIndexOf('a'));

    }

    

}

Output:

I am a bad guy

indexOf(a)2

lastindexOf(g)8

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length() and capacity() method

StringBuffer:

length() and capacity()

The length of the StringBuffer can be found by the length() method.while the total capacity can be found through the capacity() method.They have the following forms:

                      int length();

                      int capacity();

package stringdemo;

public class LengthAndCapacity {

    public static void main(String[] args) {

        StringBuffer s= new StringBuffer("Dance");

        

        System.out.println("Length="+s.length());

        System.out.println("Capacity"+s.capacity());

    }

}

OUTPUT:

Length=5

Capacity21

Here Length is 5 and capacity is 21 because room for 16 additional characters is automatically added,so result is 21.

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delete() and deleteCharAt() method

delete() and deleteCharAt() method:

Java  provides us to StringBuffer the ability to delete character using the method delete() and deleteCharAt(). These method are shown here:

         StringBuffer delete(int startIndex,int endIndex)
         StringBuffer deleteCharAt(int loc)

Here is a small program to demonstrate these method:


package stringdemo;


public class DeleteDemo {
    public static void main(String[] args) {
        StringBuffer s= new StringBuffer("I love you");
        
        s.delete(2, 5);
        System.out.println("After delete:"+s);
        
        s.deleteCharAt(0);
        System.out.println("After deleteCharAt:"+s);
    }

}

OUTPUT:

After delete:I e you

After deleteCharAt: e you

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Java program to show number pyramid

Number Pyramid:

package diamond;


public class PyramidDemo {
    public static void main(String[] args) {
        for(int i=0;i<5;i++) {
         for(int j=0;j<5-i;j++) {
             System.out.print(" ");
         }
        for(int k=0;k<=i;k++) {
            System.out.print("* ");
        }
        System.out.println();
    }

}
}

OUTPUT:

     * 

    * * 

   * * * 

  * * * * 

 * * * * * 

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Fibonacci Using Recusion method

Fibonacci Using Recusion method:

package diamond;

import static diamond.Fibonacci.fibonacciRecusion;


public class FibonacciDemo {
    public static void main(String[] args) {
        System.out.println("\nFibonacci by recusion");
        int febCount=15;
    for(int i=1; i<=febCount; i++){
      System.out.print(fibonacciRecusion(i) +" ");
    }
       
   
    }
}

The output of this program is as:

Fibonacci by recusion

1 1 2 3 5 8 13 21 34 55 89 144 233 377 610

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replace() method

Modifying a String:

replace();

    The replace method is used to replace the one character of string.It has the general form:
      
String replace(char original,char replace);


Here is a small program to show how replace() method works:

package stringdemo;


public class ReplaceDemo {
    public static void main(String[] args) {
        String s="HelloWorld";
       
        System.out.println(s.replace("H", "W"));
    }
}

Output:

WelloWorld

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concat() and trim() method

concat()

You can concat two String using concat() as shown below:


package stringdemo;


public class Concat {
    public static void main(String[] args) {
        String s1="ram";
        String s2="john";
        
        System.out.println(s1.concat(s2));
    }

}

The output of the above program is:

ramjohn

trim()

trim() method of String in java is used to remove whitespace.It has the general form:

String trim();

Here is a small program to demonstrate trim()method:

package stringdemo;

public class Trim {

    public static void main(String[] args) {

        String s="  Hello World";

        

        System.out.println(s.trim());

    }

}

The output of the above program is:

Hello World

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equals() Versus ==

equals() Versus ==

We should be clear that equals() method and == operator perform two different operations.The equals() method compares the character inside a string whereas == operator compares two object reference to see whether they refer to the same instances.Here is a small program to demonstrate the difference between equals()method vs == operator:


package stringdemo;


public class Equal {
    public static void main(String[] args) {
        String s1="john";
        String s2=new String(s1);
       
        System.out.println(s1.equals(s2));
        System.out.println(s1==s2);
    }
}

The above program gives the following output:

true

false

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equals() and equalsIgnoreCase()

String Comparision:

The String class includes many methods that compares Strings or Substrings within strings.

equals() and equalsIgnoreCase()


package stringdemo;


public class StringComparision {
    public static void main(String[] args) {
        String str="john";
        String str1="john";
        String str2="JOHN";
        String str3=new String("john");
        
        
        if(str==str1){
            System.out.println("Equal");
        }else{
        System.out.println("Not Equal");
        }
        
        if(str.equals(str1)){
            System.out.println("str is equal to str1");
        }else{
        System.out.println("str is not equal to str1");
        }
        
        if(str==str2){
        System.out.println("str is equal to str2");
        }else{
        System.out.println("str is not equal to str2");
        }
        
        if(str.equals(str2)){
            System.out.println("equals");
        }else{
        System.out.println(" not equals");
        }
        if(str.equalsIgnoreCase(str2)){
        System.out.println("equalsss");
        }else{
        System.out.println(" not equalsss");
        }
        
        if(str1==str3){
            System.out.println("str1 is equal to str3");
        }else{
        
        System.out.println("str1 is not  equal to str3");
        }
        
        if(str.equals(str3)){
            System.out.println("bang");
        }else{
            System.out.println("not bang");
        }
        }
    }

   
    The output of the above program is as below:

Equal
str is equal to str1
str is not equal to str2
 not equals
equalsss
str1 is not  equal to str3
bang

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Character Extraction

Character Extraction:

2)getChars()

If you want to extract more than one character at a time,you can use the getChars() method.
It has general form:
void getChars(int sourceStart,int sourceEnd,char target[],int targetStart);


package stringdemo;


public class NewClass {
    public static void main(String[] args) {
       
      String s="This is the demo of getChar()method";
      int start=5;
      int end=8;
       char ch[]=new char[end-start];
     
       s.getChars(start, end, ch, 0);
        System.out.println(ch);
    }
}

The output is:

is 

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Character Extraction

Character Extraction:

1) charAt()

charAt() method is used to extract single character from String.Here is a small program to demonstrate chatAt() method.  


package stringdemo;


public class NewClass {
    public static void main(String[] args) {
       
      String  ch="java";
        System.out.println(ch.charAt(1));
    }
}

The output of this program is as:

a

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String Concatenation with other data type

String Concatenation with other data type:

package stringdemo;


public class StringS {
    public static void main(String[] args) {
        String s="nine:"+4+4;
        System.out.println(s);
    }
}

Here output will be like 

nine:44.

   rather than

nine:8

To get 2nd type of output we must change the 

String s="nine:"+(4+4);

This will generate the output as:

nine:8

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