Consider the program:

Given string (Input string) and we have to whether it is empty string or not?

/*Java Program to check whether string is empty or not*/

public class JavaisEmptyPrg
{
	public static void main(String args[])
	{
		String str1="www.includehelp.com";
		String str2="";

		if(str1.isEmpty()==true)
		System.out.println("Str1 is an empty string.");
		else
		System.out.println("Str1 is not an empty string.");

		if(str2.isEmpty()==true)
			System.out.println("Str2 is an empty string.");
		else
			System.out.println("Str2 is not an empty string.");
	}
}

Output

Complie: javac JavaisEmptyPrg.java
Run: java JavaisEmptyPrg

Output

Str1 is not an empty string.
Str2 is an empty string.