Write a Java program to reverse a string without using predefined methods.

Question

Accepted Answer

Java program to reverse a string without using predefined methods.

Create a char array from the input string.
Use two pointers, one at the start and one at the end, to swap characters.
Continue swapping characters until the pointers meet in the middle.

Accepted Answer

string originalString = "test";
            string reverseString = string.Empty;
            foreach (char c in originalString)
            {
                reverseString = c + reverseString;
            }
            return reverseString;

Accepted Answer

import java.util.Scanner;

public class ReverseStringByScanner {

public static void main(String[] args) {

String str;

Scanner scanner=new Scanner(System.in);

System.out.print("Enter a String: ");

str=scanner.nextLine(); //reading string from user

System.out.print("After reverse string is: ");

for(int i=str.length();i>0;--i) //i is the length of the string

{

System.out.print(str.charAt(i-1));

}

Accepted Answer

class ReverseString

{

public static void main(String[] args)

{

String str = "Hello team";

String reverseString = "";

for(int i = str.length() - 1 ; i>=0 ; i--)

{

reverseString += str.charAt(i);

}

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

}

Accepted Answer

Sir nokri dedo

Asked in Dassault Systemes and 14 others

Write a Java program to reverse a string without using predefined methods.

Interview Questions from Popular Companies