Practical OOPS || String Buffer.java

import java.util.Scanner;
class StringBufferDemo
{
  public static void main(String[] args)
    {
        Scanner sc = new Scanner(System.in);
        StringBuffer s = new StringBuffer(20);

        System.out.print("Enter The String:");
        s.append(sc.nextLine());

        System.out.println("Length of Your String is : "+s.length());
        System.out.println("Capacity of Your String is : "+s.capacity());

        System.out.print("Enter another String to be Appended: ");
        s.append(sc.nextLine());
        System.out.println("The String after Appending is: "+s);

        System.out.print("Enter an Integer to be Appended: ");
        s.append(sc.nextInt());
        System.out.println("The String after Appending is:"+s);

        System.out.print("Enter a character to be inserted along with its position:");
        char ch = sc.next().charAt(0);
        s.insert(sc.nextInt()-1,ch);
        System.out.println("The String after Insertion is: "+s);

        System.out.println("The Reverse of the String is:"+s.reverse());//Reverse Function in the Documentation
    }
}

Practical OOPS || String Class.java

import java.util.Scanner;
class StringClass
{
  public static void main(String[] args){
    String s;
    Scanner sc = new Scanner(System.in);
    System.out.print("Enter Your String : ");
    s = sc.nextLine();
    int length =s.length();
    System.out.println("The Length Of The String : "+length);
    System.out.println("The Middle Character element of the string is: "+s.charAt(length/2));
    System.out.println("Enter another String to be Concatenated to the previous one: ");
    String b=sc.next();
    System.out.println("The Concatenated Strings are : "+s.concat(b));
  }
}