Determine output:

public class Test{
      public static void main(String args[]){
            String str = null;
            if(str.length() == 0){
                  System.out.print("1");
            }
            else if(str == null){
                  System.out.print("2");
            }
            else{
                  System.out.print("3");
            }
      }
}

In the code, the str variable is initialized as null. When the program attempts to execute str.length(), it triggers a NullPointerException because you cannot invoke methods or access properties on a null object. The code attempts to check the length of the string (str.length()) before checking if it is null (str == null), leading to the exception.

To avoid the exception, you should first check if the string is null before attempting to access its length.

How plz explain

Exception in thread "main" java.lang.NullPointerException
at gomes.main(gomes.java:10)

NullPointerException is thrown when an application attempts to use an object reference that has the null value

how it will work give the solution with given code