Your way works and is more simple than my way, however this video is supposed to teach those who don’t know how to reverse a sting WITHOUT StringBuilder. (For example in a AP CSA class they would ask you to do this without StringBuilder)

Hey there @kevswags! Thanks for sharing your approach. Indeed, using StringBuilder's reverse() method is a clever way to simplify this problem - such is the beauty of Java's vast standard libraries. It is definitely an easier method for those who are familiar with these libraries, and it's neat in its own right. However, my purpose in the video was to demonstrate the underlying logic of how a string can be reversed for those who might be new to Java or even programming in general, and in such cases, a straightforward loop could be more digestible. As one progresses, they can then appreciate the tools and methods that Java provides to simplify these processes. Keep those great ideas coming!

You have a ; (semicolon) at the end of your for loop!!!!
updated code:

String input ="Hello world!";
String output=" ";
for(int i=input.length()-1;i>=0;i--) output+=input.charAt(i);
System.out.println(output);

Hi @nahidasultana6842! Looks like you're almost there. The issue you are facing is due to the placement of the semicolon (;) at the end of your for loop declaration. Here's what's happening: the semicolon is signifying the end of the for loop, so your program never really gets to the line where you add the character to your output string. Try removing that semicolon after your for loop and your code should work as expected.

So it should look something like this:

public class HelloReverse {

public static void main(String[] args) {

String input ="Hello world!";
String output="";
for(int i=input.length()-1;i>=0;i--){
output+=input.charAt(i);
}
System.out.println(output);
}
Keep coding! Happy Java programming! 🚀

Glad it was helpful!

Thanks a lot @bankarsandipk! 😊 Your kind words always motivate us to create more informative and accessible content. Stay tuned to Mintype for more 'byte-sized' Java programming lessons! Happy coding!