Method overloading and null error in Java?

public class Test
{
    // Overloaded methods
    public void fun(Integer i)
    {
        System.out.println("fun(Integer ) ");
    }
    public void fun(String name)
    {
        System.out.println("fun(String ) ");
    }

    // Driver code
    public static void main(String [] args)
    {
        Test mv = new Test();

        // This line causes error
        mv.fun(null);
    }
}

Here the method arguments Integer and String both are not primitive data types in Java. That means they accept null values. When we pass a null value to the method1 the compiler gets confused which method it has to select, as both are accepting the null.

public class Test
{
    // Overloaded methods
    public void fun(Integer i)
    {
        System.out.println("fun(Integer ) ");
    }
    public void fun(String name)
    {
        System.out.println("fun(String ) ");
    }

    // Driver code
    public static void main(String [] args)
    {
        Test mv = new Test();
       
        Integer arg = null;

        // No compiler error
        mv.fun(arg);
    }
}

Here we wouldn’t get compile time error because we are specifying that the argument is of type Integer, hence the compiler selects the method1(Integer i) and will execute the code inside that.