String programs.....

Q.Write a java program to count the number of words in the entered sentence

 import java.io.*;
public class CountWords
{
  public static void main(String args[])throws Exception
    {
       BufferedReader stdin =new BufferedReader(new InputStreamReader(System.in));
       System.out.print("Enter the sentence: ");
       String s=stdin.readLine();
       s=' '+s;
       char ch;
       int w=0;
       for(int i=0;i<s.length();i++) //loop is used to extract each character in the sentence
        {
           ch=s.charAt(i);
           if(ch==' ')
            {
             w++;
            }
        }
     System.out.println("Number of word in the sentence:"+w);
    } //method
} //class

Q.Write a program to accept a word and  arrange the letters of words in alphabetical order

    Sample input: computer

                output:cemoprtu

import java.io.*;
public class WordAlbha
 {
     public static void main(String args[])throws Exception
     {
         InputStreamReader isr =new InputStreamReader(System.in);
         BufferedReader stdin=new BufferedReader(isr);
         System.out.print("Enter the word:");
         String word=stdin.readLine();
         char ch;
         for(int i=65;i<=90;i++)
          {
              for(int j=0;j<word.length();j++)
               {
                   ch=word.charAt(j);
                   ch=Character.toLowerCase(ch);
                   if(ch==(char)i||ch==(char)(i+32))
                   System.out.print(ch);
                }
           }
        }
    }    

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Printing Patterns....

Q.Write a program to print the following pattern
  
    *
     * *
     * * *
     * * * *
     * * * * *       

public class HalfTriangle
 {
     public void pattern(int n)
      {
          for(int i=1;i<=n;i++) //to define the number of rows
            {
              for(int j=1;j<=i;j++)
               {
                  System.out.print("* ");
                }
             System.out.println();
            }
      } //method
  } //class

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Simple programs for beginner's

Q.Write a java program to add two numbers.

     public class  addNum
    {
        public void sum(int x,int y) // creates the instance of a class
       {
   
           int z=x+y;
           System.out.print(z);
       }
 
   }
 
  Q.Write a java program to subtract two numbers.

      public class Difference
       {
           public void diff(int x,int y)
            {
              int z=x-y;
              System.out.println("The difference between "+x+" and "+y+" is "+z);
            }
      }
 Q.Write a java program to check whether the entered number is prime or composite...
     
      import java.io.*;
     public class Prime
    {
         public static void main(String args[])throws Exception
          {
             BufferedReader stdin =new BufferedReader(new InputStreamReader(System.in));
             System.out.print("Enter the number: ");
             int n=Integer.parseInt(stdin.readLine());
             int flag=0;
              for(int i=2;i<n;i++) //used to get the vales less than the entered number in loop
               {
                   if(n%i==0) //checks if the number is divisble by i
                    {
                       flag=1;
                       break; //exits from the loop
                    }
       
               }
               if(flag==0)
               {
                  System.out.println(n+" is a prime number");
               }
             else
             {
                System.out.println(n+" is a composite number");
            }
    } //method
} //class

Q.Write a java program to reverse the entered number

    import java.io.*;
   public class Reverse
    {
        public static void main(String args[])throws Exception
        {
          BufferedReader stdin =new BufferedReader(new InputStreamReader(System.in));
          System.out.print("Enter the number: ");
          int n=Integer.parseInt(stdin.readLine());
          int nr=0;
         while(n>0) //loop used to reverse the number
         {
          nr=(nr*10)+(n%10); //(n%10):extracts the last digit of the number
          n=n/10;
         }
         System.out.print(nr);
      } //method
 } //class

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This blog is mainly a guide for isc computer science students...Some solved questions are given in this blog and also guidance to java progaram....icse students can also refer to this site for learning programs.

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