isEmpty java code

The isEmpty() method is a method of the String class in Java that can be used to check if a string is empty. It returns true if the string has a length of 0, and false if it has a non-zero length.

Here is an example of how to use the isEmpty() method:

String s1 = "";
String s2 = "hello";

System.out.println(s1.isEmpty()); // Outputs true
System.out.println(s2.isEmpty()); // Outputs false

In this example, the first call to the isEmpty() method returns true because the string s1 is empty. The second call to the isEmpty() method returns false because the string s2 is not empty.

You can also use the isEmpty() method to check if a StringBuilder object is empty, like this:

StringBuilder sb = new StringBuilder();
System.out.println(sb.length() == 0); // Outputs true

sb.append("hello");
System.out.println(sb.length() == 0); // Outputs false

In this example, the first call to the length() method returns 0 because the StringBuilder object sb is empty. The second call to the length() method returns a non-zero value because the StringBuilder object sb has been modified to contain the string "hello".

For more information on the isEmpty() method and other methods provided by the String and StringBuilder classes in Java, you can refer to the Java documentation or other online resources.