In this post, we will see a Java program to reverse a string using recursion. Also learn to reverse string without recursion as well.
Read More: Reverse words in a string in Java
1. Reverse String using recursion
To reverse a string by characters, we can write a recursive function which will perform following actions –
- Take first character and append to last of string
- Perform above operation until string ends
public class StringExample
{
public static void main(String[] args)
{
String blogName = "How To Do In Java ";
String reverseString = reverseString(blogName);
System.out.println(reverseString);
}
public static String reverseString(String string)
{
if (string.isEmpty()){
return string;
}
//Calling function recursively
return reverseString(string.substring(1)) + string.charAt(0);
}
}
Program output.
avaJ nI oD oT woH
2. Reverse a sentence in Java – without recursion
You can reverse a string by character easily, using a StringBuilder.reverse() method.
public class StringExample
{
public static void main(String[] args)
{
String blogName = "How To Do In Java";
String reverseString = new StringBuilder(string).reverse();
System.out.println(reverseString);
}
}
Program output.
avaJ nI oD oT woH
In this example, you learned to reverse a string using recursive function and also without using recursive function as well.
Happy Learning !!
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Hey!
There is a problem with “Reverse a sentence -without recursion”.
There are casting errors.Why don’t you give it a try?
yes, there is casting error. I did it this way and it worked
public class test
{
public static void main(String[] args)
{
String blogName = “How To Do In Java”;
StringBuilder reverseString = new StringBuilder(blogName).reverse();
System.out.println(reverseString);
}
}