Java code to reverse a string using loops

Karmehavannan

5 years ago

Java code to reverse a string using loops

In this tutorial, we will discuss the concept of Java code to reverse a string using loops

In this post, we are going to learn how to reverse every word of the given string by the user and display the reversed string as an output

here, we are used for loop, while loop and do-while loop for display reversed string of the given string

Java code to reverse a string

Display reversed string using for loop

Program 1

The program request the user to enter a string and the program displays the reversed string of the given string using for loop in Java language

import java.util.Scanner;
class ReverseStringForloop{
public static void main(String args[]){
    String str;//declare a String variable
    char ch;//declare a char variable
    System.out.println("Enter a String as you wish: ");
    //ask input from the user
Scanner scan=new Scanner(System.in);
//cretae scanner object
    
   str =scan.nextLine();
   System.out.println("Reserve of given String "+str+" is : ");
   for(int j=str.length(); j>0; j--){
       System.out.print(str.charAt(j-1));
   }
}
}

When the above code is executed, it produces the following result

Explanation

The user is asked to enter a string and it is stored in the character variable of ‘str’
The length of the string is assigned to variable ‘J’
The for loop is used to create the reversed string
The for loop is functioning until ‘j’ is greater than zero
Finally, the output is displayed as the reversed string

Display reversed string using while loop

Program 2

The program request the user to enter a string and the program displays the reversed string of the given string using while loop in Java language

import java.util.Scanner;
class ReverseStringwhileloop{
public static void main(String args[]){
    String str;
    char ch;
    System.out.println("Enter a String as you wish: ");
    //ask input from the user
Scanner scan=new Scanner(System.in);
//cretae scanner object
    
   str =scan.nextLine();
   System.out.println("Reserve of given String "+str+" is : ");
   int j=str.length();
   while(j>0){
       System.out.print(str.charAt(j-1));
        j--;
   }
}
}

When the above code is executed, it produces the following result

Explanation

The user is asked to enter a string and it is stored in the character variable of ‘str’
The length of the string is assigned to variable ‘J’
The while loop is used to create the reversed string
The while loop is functioning until ‘j’ is greater than zero
Finally, the output is displayed as the reversed string

Display reversed string using do-while loop

Program 3

The program request the user to enter a string and the program displays the reversed string of the given string using do-while loop in Java language

import java.util.Scanner;
class ReverseStringDowhileloop{
public static void main(String args[]){
    String str;
    char ch;
    System.out.println("Enter a String as you wish: ");
    //ask input from the user
Scanner scan=new Scanner(System.in);
//cretae scanner object
    
   str =scan.nextLine();
   System.out.println("Reserve of given String "+str+" is : ");
   int j=str.length();
   do{
       System.out.print(str.charAt(j-1));
        j--;
   }while(j>0);
}
}

When the above code is executed, it produces the following result

Explanation

The user is asked to enter a string and it is stored in the character variable of ‘str’
The length of the string is assigned to variable ‘J’
The do-while loop is used to create the reversed string
The do-while loop is functioning until ‘j’ is greater than zero
Finally, the output is displayed as the reversed string

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