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Calling a method using null in Java
When a method is invoked on a null reference, it throws NullPointerException but in case of the static method, we can make it possible using cast expression. See the example below −
Example
public class Tester {
public static void display(){
System.out.println("display");
}
private void print() {
System.out.println("print");
}
public static void main(String[] args) {
//Scenario 1:
//Calling a method on null reference
//causes NullPointerException
try {
Tester test = null; test.print();
}catch(Exception e) {
System.out.println(e.getMessage());
}
//Scenario 2:
//Static method can be invoked
//on a null object by using the casting expression
((Tester)null).display();
}
}Output
null display
Notes
Scenario 1 demonstrates the code causing NullPointerException.
Scenario 2 demonstrates the use of the static method by evaluating a class name on a null object.
Updated on: 18-Jun-2020
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