In this article, we will be discussing how to override methods in Java. Overriding methods is a powerful mechanism that allows us to customize the behavior of a class or method without having to create a new version of that class or write any additional code. We will also look at some common scenarios where overriding methods can be useful and show you how to do it in Java.
What overriding is
overriding is a technique in Java programming language in which a method within a class is replaced with a different one, without modifying the original code.
Overriding methods and classes
In Java, it is possible to override methods and classes. overriding refers to inheriting from a base class, which will then give the overriding method or class precedence over any other methods or classes in the hierarchy. Overriding can be helpful when you want to customize an existing class or add new functionality to an existing class.
A common use for overriding in Java is to provide a custom interface. Suppose you have a custom library that contains two implementations of the I insulation interface: One that uses the default constructor and one that uses a static initializer. You might want to provide a single implementation of I for your users, using the static initializer. To do this, you would override the I constructor in your custom library.
Overriding can also be helpful when you need to change the behavior of an inherited method without modifying the original source code. Suppose you have a class MyClass that inherits from ClassA and defines a method m() that takes an int argument. You might want to change the behavior of m() so that it accepts an arbitrary object as its parameter instead of just an int. To do this, you would replace the m() method in MyClass with an overridden version that takes an arbitrary
Overriding methods from other packages
When overriding methods in Java, it is important to keep a few things in mind. First, overriding a method in a parent package overrides any methods in any subpackages that the parent package includes. Second, overriding methods in the same package overrides methods in any subpackages of that package. Finally, overriding methods in a child package overrides any methods in any subpackages of the child package and any superclasses or interfaces of the child package.
Overriding methods in a class
Java is a statically typed language, meaning that the type of an object is determined at compile time. This can be a bit limiting, as it can be difficult to override methods in a class without knowing the exact type of the object. In this article, we will discuss how to override methods in Java without knowing the class’s precise type.
We begin by creating a new class called Test that will contain a method stub that we want to override. We create a new file called Test.java and add the following code:
package org.mycompany; import java.lang.reflect.Method; public class Test { // Method stub public voidMethod() {} }
Next, we need to create an instance of our Test class and pass it into our Method object’s getDeclaredMethods() method. This returns an array of Method objects, each representing a method declared in the given class or interface. We can use this array to find our desired method by searching for its name using the ? operator:
Method method = Method.getDeclaredMethods();
The ? operator returns an Object reference if the input string does not contain any wildcard characters (such as * and ? ). If the
Overriding methods in a method
In Java, you can override a method by creating a new method with the same name and signature as the original, but with one or more additional arguments. For example, if you have a method named addNumbers() that takes two int arguments, you can create a new method called multiplyNumbers() that takes three int arguments. The following code shows how to create and call the new multiplyNumbers() method:
public static void main(String[] args) {
Integer number1 = 5;
Integer number2 = 10;
Integer number3 = 15;
System.out.println(“Number1: ” + number1);
System.out.println(“Number2: ” + number2);
System.out.println(“Number3: ” + number3);
MultiplyNumbers multiplier = new MultiplyNumbers();
multiplier.addNumbers(number1, number2);
multiplier.addNumbers(number3, number2);
System.out.println(“multiplier result: ” + multiplier.result());
}
Number1: 15
Number2: 20
Number3: 25