Lowercase to Uppercase, Length of Array, Character count

import java.util.Arrays;

public class Main{

     public static void main(String []args){

        char c1='s';

        String str1="rock";

        char[] str2= {'s', 't', 'a', 'r'};

        String str3=new String("star");

        String str4="star";

        System.out.println(str1+" "+str3);

        System.out.println(str1.toUpperCase()+ " "+str3.toUpperCase());

        System.out.println(Arrays.toString(str2));

        int arrLength = str2.length;

        System.out.println("The length of array is: " + arrLength);

        

        System.out.println(str1+ str1.length());

        System.out.println(str2.length);

     }

}

Output: 

rock star                                                                                                               

ROCK STAR                                                                                                               

[s, t, a, r]                                                                                                            

The length of array is: 4                                                                                               

rock4                                                                                                                   

4  

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1. Max and min, 2. sum and avg, 3. search for an element, 4. move the min to the beginning

 1. Max and min, 2. sum and avg, 3. search for an element, 4. move the min to the beginning

Max= 20 Min= 2                                                   

Sum= 39 Avg= 7.8                                                 

Please Enter any value:                                          

89                                                               

[10, 2, 20, 3, 4]                                                

[2, 10, 20, 3, 4] 

import java.util.Scanner;
import java.util.Arrays;
public class Main
{
public static void main(String[] args) {
        int Arr[]= {10, 2, 20, 3, 4};
        
        int max=Arr[0], min=Arr[0];
        for(int i=0; i< Arr.length; i++) {
            if(Arr[i]> max)max=Arr[i];
            if(Arr[i]< min)min=Arr[i];
        }
        System.out.println("Max= "+max+" Min= "+min);
        
        int sum=0;
        for(int j=0; j<Arr.length; j++) {
            sum=sum+Arr[j];
        }
        double avg=(double)sum/Arr.length;
        System.out.println("Sum= "+sum+" Avg= "+avg);
        
        Scanner scn= new Scanner(System.in);
        System.out.println("Please Enter any value: ");
        int value=scn.nextInt();
        
        boolean Flag=false;
        for(int k=0; k<Arr.length; k++) {
            if(value== Arr[k]) 
                Flag=true;
            if(Flag)
                System.out.println("Not Found");
        
        System.out.println(Arrays.toString(Arr));
        int temp;
        for (int q=1; q<Arr.length; q++){
            if (Arr[q]<Arr[0]){
                temp=Arr[q];
                Arr[q]=Arr[0];
                Arr[0]=temp;
            }
        }
        System.out.println(Arrays.toString(Arr));
        }
        //System.out.println(Arrays.toString(Arr));
        
}
}

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Arrays

import java.util.Scanner;
import java.util.Arrays;
public class Main
{
public static void main(String[] args) {
        int x[] = new int [10];
        
        int[] y;
        y=new int[5];
        
        x[0]=10;
        x[1]=20;
        x[9]=50;
        
        int z[]={1,2,3,4,5};
        System.out.println(Arrays.toString(x));
        //x[10,20,000,50];
        System.out.println(x[0]);
        System.out.println(x[1]);
        System.out.println(x[z.length]);
        Scanner scn= new Scanner (System.in);
        for(int i=0; i<y.length; i++)
            y[i]=scn.nextInt();
            
        for(int i=0; i<y.length; i++)
            System.out.print(y[i]+" ");
}
}

===========================

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charAt, indexOf, substring, equals

 

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Triangle Star

 *
**
***

import java.util.Scanner;

public class Main

{

public static void main(String[] args) {

        for(int i=1; i<=3; i++){

            for(int j=1; j<=i;j++){

                System.out.print("*");

            }

        System.out.println();

        }

}

}

==============

  *

 **

***

import java.util.Scanner;

public class Main{

   public static void main(String[] args){

      Scanner scan = new Scanner(System.in);

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

      int row = scan.nextInt();

      for (int i = 1; i <= row; i++){

         for (int j = row; j >= i; j--){

            System.out.print(" ");

         }

         for (int j = 1; j <= i; j++){

            System.out.print("* ");

         }

         System.out.println();

      }

   }

}

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Switch Case Weekdays

import java.util.Scanner;
public class Main
{
public static void main(String[] args) {
    Scanner scn = new Scanner(System.in);
    System.out.print("Please enter any number: ");
    int num = scn.nextInt();
    switch(num) {
        case 1:
            System.out.println("It's Sunday");
            break;
        case 2:
            System.out.println("It's Monday");
            break;
        case 3:
            System.out.println("It's Tuesday");
            break;
        case 4:
            System.out.println("It's Wednesday");
            break;
        case 5:
            System.out.println("It's Thursday");
            break;
        case 6:
            System.out.println("It's Friday");
            break;
        case 7:
            System.out.println("It's Saturday");
            break;
        default:
            System.out.println("It's wrong day number");
            
    }
}
}

===============

//Nested if

import java.util.Scanner;

public class Main

{

public static void main(String[] args) {

    Scanner scn = new Scanner(System.in);

    System.out.print("Please enter any number: ");

    int num = scn.nextInt();

        if(num==1)

            System.out.println("It's Sunday");

            

        else if(num==2)

            System.out.println("It's Monday");

           

        else if(num==3)

            System.out.println("It's Tuesday");

            

        else if(num==4)

            System.out.println("It's Wednesday");

            

        else if(num==5)

            System.out.println("It's Thursday");

            

        else if(num==6)

            System.out.println("It's Friday");

            

        else if(num==7)

            System.out.println("It's Saturday");

            

        else

            System.out.println("It's wrong day number");

}

}

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1+2+3+.....+10=55

 public class Main
{
public static void main(String[] args) {
    int sum=0;
    for(int i=1; i <= 10; i++) {
        sum=sum+i;
    }
    System.out.println("Sum= "+ sum);
}
}

Output: Sum= 55

===========

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Fibonacci number (0 1 1 2 3 5 8 13 21 34)

 Question: 0   1   1   2   3   5   8   13   21   34

*Used while loop

import java.util.Scanner;
public class Main
{
public static void main(String[] args) {
Scanner scan = new Scanner(System.in);
System.out.print("Please enter number of terms: ");
int t=scan.nextInt();
//0   1   1   2   3   5   8   13   21   34
int i=0, j=1, k=2;
while (k <= t) {
    System.out.print(" "+i + " "+j);
    i=i+j;
    j=i+j;
    k+=2;
}
}
}

====================

*Used For Loop

import java.util.Scanner;

public class Main

{

public static void main(String[] args) {

Scanner scan = new Scanner(System.in);

System.out.print("Please enter number of terms: ");

int t=scan.nextInt();

//0   1   1   2   3   5   8   13   21   34

int i=0, j=1, sum;

for (int m=1;m<=t; ++m) {

    System.out.print(i + " ");

    sum=i+j;

    i=j;

    j=sum;

}

}

}

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Read & Write using string (Name and Father name)

 import java.util.Scanner;
public class Main
{
public static void main(String[] args) {
String s1, s2;

Scanner scan = new Scanner(System.in);
System.out.print("Please enter your name: ");
s1 = scan.nextLine();

System.out.print("Please enter your father name: ");
s2 = scan.nextLine();

System.out.println(s1+" "+s2);
}
}

=================

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Even or Odd

 public class Main
{
public static void main(String[] args) {
int num = 19;
if(num%2==0)
    System.out.println("The number is even.");
else
    System.out.println("The number is odd.");
}
}

Output: The number is odd.

====================

*import from user

import java.util.Scanner;

public class Main

{

public static void main(String[] args) {

Scanner scan = new Scanner(System.in);

System.out.print("Please enter any integer number: ");

int num = scan.nextInt();

if(num%2==0)

    System.out.println("The number is even.");

else

    System.out.println("The number is odd.");

}

}

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Max Program (Find the Max number)

public class Main

{
public static void main(String[] args) {
int x = 0;
int y = 1;
int max = x>y?x:y;

System.out.println("x = "+ x);
System.out.println("y = "+ y);
System.out.println("max = "+ max);
}
}

Output:

x = 0
y = 1
max = 1

======================

public class Main

{

public static void main(String[] args) {

int x = 4;

int y = 1;

int max;

if (x > y)

    max = x;

else

    max = y;

System.out.println("x = "+ x);

System.out.println("y = "+ y);

System.out.println("max = "+ max);

}

}

Output:

x = 4
y = 1
max = 4

===============

#input from user

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JAVA PROGRAMMING

 public class Main

{

public static void main(String[] args) {

System.out.println("Hello World");

}

}

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