swerWhich of these packages contains abstract keyword?Optionsjava.langjava.iojava.utiljava.system

To determine which of the mentioned packages contains the abstract keyword, let's analyze each option briefly:

1. java.lang: This is a core package that contains fundamental classes that are essential to the Java programming language. It includes classes such as Object, String, and System. The abstract keyword is often used in this package, particularly in the definition of the Runnable interface and other abstract classes.

2. java.io: This package deals with input and output operations in Java. It includes classes such as File, InputStream, and OutputStream. It also uses the abstract keyword, particularly in the definition of abstract classes like InputStream.

3. java.util: This package provides utility classes, including collection framework classes such as ArrayList, HashMap, and others. Many of the classes and interfaces in this package utilize the abstract keyword.

4. java.system: This is not a standard package in the Java language. Instead, system-level functionalities can generally be accessed through other packages such as java.lang or java.util.

Final Answer:

The correct options that contain the abstract keyword are java.lang, java.io, and java.util.