Java Program to implement String and StringBuffer Class

//filename: Exp04_3.java



import java.io.*;



class Exp04_3

{



 public static void main(String[] args) throws IOException

 {

  BufferedReader b=new BufferedReader(new InputStreamReader(System.in));

  System.out.println("Enter a string");

  String s1=b.readLine();

  System.out.println("\nEnter the character to be searched");

  char c=(char)b.read();

  int count=FindFrequencyCount(s1,c);

  System.out.println("\nThe number of appearance of "+c+" is "+count);

  ReplaceCharacter(s1);

  ReplaceFirstCharacter(s1);

 }



 public static int FindFrequencyCount(String s1, char c)

 {

  int n,count=0;

  n=s1.length();

  for(int i=0;i<n;i++)

  {

   if (s1.charAt(i)==c)

    count++;

   }

  return(count);

 }



 public static void ReplaceCharacter(String s1)

 {

  System.out.println("\nThe new string is "+s1.replace(s1.charAt(0),s1.toUpperCase().charAt(0)));

 }



 public static void ReplaceFirstCharacter(String s1)

 {

  System.out.println("\nString before modification: "+s1);

  s1.trim();

  StringBuffer sb=new StringBuffer();

  for(String onestring:s1.split(" "))

  {

   sb.append(onestring.substring(0,1).toUpperCase() );

   sb.append(onestring.substring(1));

   sb.append(" ");

  }

  System.out.println("String after modification: "+sb);

 }



}





/* OUTPUT



Enter a string

all the best



Enter the character to be searched

t



The number of appearance of t is 2



The new string is All the best



String before modification: all the best

String after modification: All The Best   */