What exactly is data overriding?

Question

How to use it in a Java program and what is it's function ?

Answer 1

Overriding in programming usually means overriding a function. What does it mean? It means that you can make function with the same name, but different arguments. For example:

public String sayMyName() {
return "My name is Joe" ;
}

public String sayMyName(String name) {
return "My name is" + name;
}

You can override constructors and normal methods.