How to Read Integers from Standard Input in Java?

Reading Integers from Standard Input in Java

Reading integer values from the standard input (console) is a common task in Java programming. To accomplish this, you can utilize the java.util.Scanner class.

Using Scanner

Instantiate a Scanner object using the new keyword and provide System.in as an argument. System.in represents the standard input stream.

import java.util.Scanner;

//...

Scanner in = new Scanner(System.in);

Reading an Integer

To read an integer value from the console, use the nextInt() method:

int num = in.nextInt();

The nextInt() method returns the next integer value found in the console input.

Considerations

• Closing the Scanner object using in.close() is recommended for resource cleanup.
• Scanner can also tokenize input using regular expressions and provide other input handling capabilities.
• Alternatively, you can use low-level methods like BufferedReader and InputStream for more control over input operations, but Scanner provides a convenient and common interface for this task.

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