String Reverse in Java: Single Line Solution

Program to Reverse a String

Input:
str="Navnath"
Original String is: "Navnath"

Output:
revstr="htanvaN"
Reverse String is: "htanvaN"

Solution:

Language Used: Java

Approach 1: String Concatination

import java.util.Scanner;

public class reverse_string {

    public static void main(String[] args) {

        Scanner s= new Scanner(System.in) ;
        System.out.println("Enter the string");
        String str = s.next() ;
        String revstr = " " ;
        int len=str.length() ;
        System.out.println("Original String is: "+ str);

        for(int i=len-1;i>=0;i--)
        {
            revstr = revstr+str.charAt(i) ;
        } 

        System.out.println("Reverse String is: "+ revstr);

    }
}

Approach 2: By Using StringBuffered Class

import java.util.Scanner;

public class reverse_string {

    public static void main(String[] args) {

        Scanner s= new Scanner(System.in) ;
        System.out.println("Enter the string");
        String str = s.next() ;
        System.out.println("Original String is: "+ str);
        // logic
        StringBuffer sb = new StringBuffer(str) ;
        StringBuffer revstr = sb.reverse() ;    


        System.out.println("Reverse String is: "+ revstr);

    }
}

Approach 3: By using StringBuilder Class

import java.util.Scanner;

public class reverse_string {

    public static void main(String[] args) {

        Scanner s= new Scanner(System.in) ;
        System.out.println("Enter the string");
        String str = s.next() ;
        System.out.println("Original String is: "+ str);

        //LOGIC3 - By using StringBuilder class
        StringBuilder sbl = new StringBuilder() ;
        sbl.append(str) ;
        StringBuilder revstr = sbl.reverse() ;

        System.out.println("Reverse String is: "+ revstr);

    }
}