Java Streams, File Handling, and Database Connectivity Quiz

15 Questions

What is the purpose of input streams in Java?

To read data from a source

Which class is used to get user input in Java?

java.util.Scanner

What does the java.io package contain?

Classes required for input and output operations

Which stream is used as the standard input stream in Java?

System.in

What is the purpose of the System.out stream in Java?

To write data to a destination

Which package contains all the classes required for input and output operations in Java?

java.io package

What is the purpose of the Scanner class in Java?

To get user input

Which stream is used as the standard error stream in Java?

System.err

What is the purpose of output streams in Java?

To write data to a destination

What does the java.util package contain in Java?

Classes for input and output operations

Which method of the Scanner class is used to read an integer input in Java?

nextInt()

What happens if you attempt to use the nextInt() method of the Scanner class to read a non-integer input?

It throws an InputMismatchException

In Java, which stream is used to write data to a destination, such as a file or peripheral device?

OutputStream

What is the purpose of the System.err stream in Java?

To write error messages to the console

Which package contains the Scanner class in Java for getting user input?

java.util

Study Notes

Input/Output Streams in Java

Input Streams in Java: Input streams are used to read data from various sources, such as keyboard, file, or network.
Getting User Input in Java: The Scanner class is used to get user input in Java.

Java Packages and Streams

java.io Package: The java.io package contains all the classes required for input and output operations in Java.
Standard Input Stream in Java: The System.in stream is used as the standard input stream in Java.
Standard Output Stream in Java: The System.out stream is used to write output to the screen, such as displaying messages or results.
Standard Error Stream in Java: The System.err stream is used to write error messages to the screen.

Scanner Class in Java

Purpose of Scanner Class: The purpose of the Scanner class is to get user input from various sources, such as keyboard, file, or string.
Reading Integer Input in Java: The nextInt() method of the Scanner class is used to read an integer input in Java.
Error Handling in Scanner Class: If you attempt to use the nextInt() method of the Scanner class to read a non-integer input, it will throw an InputMismatchException.

Output Streams in Java

Output Streams in Java: Output streams are used to write data to a destination, such as a file or peripheral device.

Packages and Classes in Java

java.util Package: The java.util package contains various utility classes, including the Scanner class.