Since static methods can be called directly from the class (i.e. ClassName.methodName), why it is required to call a static method with the object of the class?
If someone knows then, elaborate with example.
public static void methodA(){
}
解决方案
The following code contains an example, in which a static method is called via a null reference.
public class Test {
public static void main(String... args) {
Test test = null;
test.greeting(); // call with null reference
}
public static void greeting() {
System.out.println("Hello World");
}
}
Because Test::greeting is a static method, the expression test.greeting() is identical to Test.greeting(). For that reason, there is no NullPointerException thrown at runtime.
