Default Methods for String Manipulation in Java

Write a Java program to demonstrate the use of an interface with default methods for string manipulation

The StringUtil interface defines two default methods: reverse() and toUpperCase().
The reverse() method reverses the given input string using the StringBuilder class.
The toUpperCase() method converts the given input string to uppercase.
The Main class implements the StringUtil interface.
In the main() method of the Main class, an instance of Main class is created.
A string str is defined with the value "Tutor Joes".
The reverse() method is called on the main object to reverse the string str, and the result is printed.
The toUpperCase() method is called on the main object to convert the string str to uppercase, and the result is printed.

Source Code

interface StringUtil
{
	default String reverse(String input)
	{
		return new StringBuilder(input).reverse().toString();
	}
 
	default String toUpperCase(String input)
	{
		return input.toUpperCase();
	}
}
 
public class Main implements StringUtil
{
	public static void main(String[] args)
	{
		Main main = new Main();
		String str = "Tutor Joes";
 
		System.out.println("Reversed String : " + main.reverse(str));
		System.out.println("Uppercase String : " + main.toUpperCase(str));
	}
}

Output

Reversed String : seoJ rotuT
Uppercase String : TUTOR JOES

Default Methods for String Manipulation in Java

Source Code

Output

Example Programs

Interface Programs in Java