Which of these packages contain classes and interfaces used for input & output operations of a program?Optionsjava.langjava.utiljava.ioall of the mentioned

To determine which packages contain classes and interfaces used for input and output operations in Java, let's analyze the options provided.

1. java.lang: This package is the fundamental package in Java, containing core classes like String, System, and Math. It does not specifically deal with input and output operations.

2. java.util: This package contains utility classes such as ArrayList, HashMap, and Date, but it does not directly provide classes or interfaces for input and output operations.

3. java.io: This package is specifically designed for input and output operations and includes classes like FileInputStream, FileOutputStream, BufferedReader, and PrintWriter. It is the main package for handling input and output in Java.

4. All of the mentioned: This option implies that all preceding packages contain classes for input and output, which is not correct.

Final Answer

The correct answer is java.io.