Dispaly the sum of all perfect number within 1 to 1000 in java

class PerfectSum
{
    public static void main(String[] args)
    {
        int i, j, end, sum,sum1=0;

   
    System.out.println("Sum Of All Perfect numbers between 1 to 1000\n");
    
    for(i=1; i<=1000; i++)
    {
        sum = 0;

       for(j=1; j<i; j++)
        {
            if(i % j == 0)
            {
                sum += j;
            }
        }
      
        if(sum == i)
        {
            System.out.println(" "+i);
            sum1=sum1+i;
        }
    }
    System.out.print(" Sum Of All Perfect No. is: "+sum1);
    }
}

Display all three(3) Digit Pallindrome Number in java

class  PalindromeNo
{
   
    public static void main(String[] args)
    {
        int num, rem, rev, temp;
        System.out.println(" \n3 Digit Palindrome numbers: \n");
        for(num=100;num<=1000;num++)
            {
                temp=num;
                rev=0;
                while(temp>0)
                    {
                        rem=temp%10;
                        temp=temp/10;
                        rev=rev*10+rem;
                    }
                if(num==rev)
                    System.out.print(" "+num);
            }
    }
}

Display all Disarium Number Between 1 to 100000 in java

class  DisariumNo
{
    static int calculateLength(int n)
            {
            int length = 0;
            while(n != 0)
                {
                length = length + 1;
                n = n/10;
                }
            return length;
            }
           
 static int pow(int n,int p)
    {
         int pw=1;
         while(p>0)
        {
             pw=pw*n;
             p--;
         }
             return pw;
         }

static int sumOfDigits(int num)
         {
         int sum = 0, rem = 0;
         int len = calculateLength(num);
       
         while(num > 0)
             {
                 rem = num%10;
                 sum = sum + pow(rem,len);
                 num = num/10;
                 len--;
             }
            return sum;
         }  
       
  public static void main(String[] args)
    {  
    int result = 0;    
    System.out.println("Disarium numbers between 1 and 100000 are\n");   
    for(int i = 1; i <= 100000; i++)
        {
            result = sumOfDigits(i);
            if(result == i)   
            System.out.print(", " +i);
        } 
    }
}

Display how many Armstrong Number Between 1 to 1000 in Java

class ArmstrongNo
{
    public static void main(String[] args)
    {
    int n, temp, d1, d2, d3;   
    System.out.println("Print all Armstrong numbers between 1 and 1000:\n");
    n = 001;
    while (n <= 900)
    {
        d1 = n - ((n / 10) * 10);
        d2 = (n / 10) - ((n / 100) * 10);
        d3 = (n / 100) - ((n / 1000) * 10);
        temp = (d1 * d1 * d1) + (d2 * d2 * d2) + (d3 * d3 * d3);
        if (temp == n)
        {
            System.out.println("\n Armstrong no is: " +temp);
        }
        n++;
    }
    }
}

Print all the prime number between 1 to 100 in java

class  PrimeNo
{
    public static void main(String[] args)
    {
        int i, n = 1, count;
        System.out.println("Prime Number Between 1 to 100");
        while(n <= 100)
            {
            count = 0;
            i = 2;
            while(i <= n/2)
                {
                if(n%i == 0)
                    {
                    count++;
                    break;
                    }
                i++;
                }
                if(count == 0 && n != 1 )
                {
                    System.out.println(" "+ n);
                }
            n++;
        }

    }
}

Program to Dual Case Single Statement In Java to Perform Calculation By accepting Small Or Big Alphabet

import java.util.*;
class Switch2
{
public static void main(String[] args)
{
Scanner sc=new Scanner(System.in);
char ch;
int a,b,c;
System.out.println("\n\n\tInput Two Number.");
a=sc.nextInt();
b=sc.nextInt();

System.out.println("\n\n\tCalculation Program.");
System.out.println("\n\n\tPress A for Addition + .");
System.out.println("\n\n\tPress S for Subtraction -  .");
System.out.println("\n\n\tPress M for Multiplication *  .");
System.out.println("\n\n\tPress D for Division /  .");
System.out.print("\n\n\tMake Your Choice.===> ");

ch=sc.next().charAt(0); //There is No nextChar()  in Java
switch(Character.toUpperCase(ch)) // Convert Lower case To Upper Case

{
case 'A': //case 'a':
System.out.println("\n\n\tAddition Program.");
c=a+b;
System.out.println("\n\n\tSum= ."+c);
break;

case 'S': //case 's':
System.out.println("\n\n\tSubtraction Program.");
c=a-b;
System.out.println("\n\n\tSubtraction= ."+c);
break;

case 'M': //case 'm':
System.out.println("\n\n\tMultiplication Program.");
c=a*b;
System.out.println("\n\n\tMultiplication= ."+c);
break;

case 'D': //case 'd':
System.out.println("\n\n\tDivision Program.");
c=a/b;
System.out.println("\n\n\tDivision= ."+c);
break;

default:
System.out.println("\n\tWrong Entry");
break;

}

}

}

Switch Case Print Week days Program In Java

import java.util.*;
class Switch1
{
public static void main(String[] args)
{
Scanner sc = new Scanner(System.in);
int ch;
System.out.println("\n\tEnter the Day Number 1 to 7");
ch=sc.nextInt();
switch(ch)
{
case 1:
System.out.println("\n\tMonday");
break;

case 2:
System.out.println("\n\tTuesday");
break;

case 3:
System.out.println("\n\tWednesday");
break;

case 4:
System.out.println("\n\tThrusday");
break;

case 5:
System.out.println("\n\tFriday");
break;

case 6:
System.out.println("\n\tSaturday");
break;

case 7:
System.out.println("\n\tSunday");
break;

default:
System.out.println("\n\tWrong Entry");
break;
}
}
}

Program to add two array in Java

import java.util.*;
class AddArray
{
public static void main(String[] args)
{
int array1[]=new int[100];
int array2[]= new int[100];
int array3[]=new int[100];
int i,j,n;
Scanner sc=new Scanner(System.in);
System.out.println("\n\t\tProgram To Add Two Array.!");
System.out.print("\n\t\tEnter the Default size Of two Array==> ");
n=sc.nextInt();
System.out.println("Enter the " +(n+1)+" element in first Array array1");
for(i=0;i<=n;i++)
{
System.out.print("\n\t\tarray1["+i+"]= ");
array1[i]=sc.nextInt();
}

System.out.println("Enter the " +(n+1)+" element in second Array array2");
for(i=0;i<=n;i++)
{
System.out.print("\n\t\tarray2["+i+"]= ");
array2[i]=sc.nextInt();
}
System.out.println("\n\t\tElements in Array1 .!");
for(i=0;i<=n;i++)
{
System.out.print("\n\t\tarray1["+i+"]= "+array1[i]);
}
System.out.println("\n\t\tElements in Array2 .!");
for(i=0;i<=n;i++)
{
System.out.print("\n\t\tarray2["+i+"]= "+array2[i]);
}
System.out.print("\n\t\tAddition Of Array1 and Array2");
for(i=0;i<=n;i++)
{
array3[i]=array1[i]+array2[i];
System.out.println("\n\n\t\tArray1["+i+"]+Array2["+i+"]==>("+array1[i]+"+"+array2[i]+")=Array3["+i+"]= "+array3[i]);
}
}
}

OUTPUT

Bubble Sort Using User Input in Java

import java.util.*;
class Array2
{
public static void main(String[] args)
{
int array1[]=new int[100];
int i,j,n;
Scanner sc=new Scanner(System.in);
System.out.print("\n\n\t\tEnter The Size Of Array===> ");
n=sc.nextInt();
System.out.println("\n\n\t\tEnter The "+n+" Element Of Array");
for(i=0;i<=n;i++)
{
array1[i]=sc.nextInt();
}
System.out.println("\n\n\t\tElements in Array Before Sorting===>");
for(i=0;i<=n;i++)
{
System.out.print("\n\t\tArray"+i+"="+array1[i]);
}
System.out.println("\n\n\t\tElements in Array After Sorting===>");
for(i=0;i<=n;i++)
{
for(j=i+1;j<=n;j++)
{
if(array1[i]>array1[j]){
int temp=array1[i];
array1[i]=array1[j];
array1[j]=temp;}
}
System.out.print("\n\t\tArray"+i+"="+array1[i]);
}

}
}

Sort Array element in Java

class SortArray
{
public static void main(String[] args)
{
int[] a={5,2,8,0,1,33,45,22,11,99};
int i,j,temp;
System.out.println("\n\t\tArray Before Swapping===>  ");
for(i=0; i<=9;i++)
{
System.out.println("\n\t\ta"+i+ "="+a[i]);
}
System.out.println("\n\t\tArray After Swapping===>  ");
for(i=0;i<=9;i++)
{
for(j=i+1;j<=9;j++)
{
if(a[i]>a[j])
{
temp=a[i];
a[i]=a[j];
a[j]=temp;
}
}
System.out.println("\n\t\ta"+i+ "="+a[i]);
}
}
}