How to Take Input from User in Java?

User input is a fundamental aspect of any applications. It allows program to interact with users, making it dynamic and responsive. In Java, there are several ways to obtain user input, with the most common methods involving the Scanner class, the BufferedReader class, and Console class.

Take Input Using Java Scanner Class

Java Scanner class allows the user to take input from the console. It belongs to java.util package. It is used to read the input of primitive types like int, double, long, short, float, and byte. It is the easiest way to read input in Java program.

Syntax

The above statement creates a constructor of the Scanner class having System.in as an argument. It means it is going to read from the standard input stream of the program. The java.util package should be import while using Scanner class.

It also converts the Bytes (from the input stream) into characters using the platform's default charset.

We must follow the steps to read input form user.

1. Import the Scanner Class

2. Create a Scanner object:

3. Read different types of input:

Methods of Java Scanner Class

Java Scanner class provides the following methods to read different primitives types:

Example of integer input from user

The following example allows user to read an integer form the System.in.

File Name: UserInputDemo.java

Output:

Example of String Input from user

Let's see another example, in which we have taken string input.

File Name: UserInputDemo1.java

Output:

Take Input Using Java BufferedReader Class

The BufferedReader class belongs to java.io package. It can be used to read text from an input stream efficiently. It is particularly useful when we need to read large amounts of text.

1. Import the necessary classes:

2. Create a BufferedReader object:

3. Read input:

Let's create a complete Java program.

File Name: BufferedReaderExample.java

Output:

 Enter your name: manoj Enter your age: 21 Enter your height: 175 Name: manoj Age: 21 Height: 175.0 

Java get input from user MCQ

1. Which method is used to read integer input from the user using the Scanner class?

1. scanner.nextInt()
2. scanner.readInt()
3. scanner.getInt()
4. scanner.fetchInt()

2. How can you handle the InputMismatchException while reading input using Scanner?

1. Using a try-catch block
2. Using an if statement
3. Using a switch statement
4. Using a for loop

3. Which class is used to read input from the console in a secure manner, without echoing characters to the console?

1. Scanner
2. BufferedReader
3. DataInputStream
4. Console

4. What is the correct way to read a double value input from the user using Scanner?

1. scanner.nextDouble()
2. scanner.readDouble()
3. scanner.fetchDouble()
4. scanner.getDouble()

5. How can you read multiple lines of input from the user using BufferedReader?

1. Using bufferedReader.readLine() in a loop
2. Using bufferedReader.nextLine()
3. Using bufferedReader.readAll()
4. Using bufferedReader.readLines()