In java.util package, the scanner is one of the classes that help in collecting multiple inputs of the primitive types such as double, integer, strings, etc. Though it is not an efficient way of reading inputs in a Java program where time acts as a constraint, it is undoubtedly one of the easiest ways to collect multiple inputs from the user. 

This article aims to share practical insights and methods for using the Scanner class to capture multiple inputs seamlessly. By exploring techniques such as the Java nextLine() method, as well as nextInt() and nextDouble() methods, I hope to equip you with the knowledge to implement these strategies effectively in your projects. As we dive into these methods, the goal is to provide a comprehensive guide that will improve your ability to develop dynamic Java applications through proficient input handling. 

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Methods for Taking Multiple Inputs Using Scanner

You must import java.util package in a program before using the Scanner class. The following table lists the methods used to take multiple inputs of different types from the user in a Java program.

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Using Java nextLine() Method

The java.util.Scanner.nextLine() method returns the line that was skipped by advancing the scanner past the current line. If a line separator is given at the end of the current line, this method excludes it and returns the string’s rest from the current line. The scanner is set at the next line beginning and reads the entire string, including the words’ white spaces.

The syntax for nextLine() method is as follows:

Public String nextLine()

This method throws the following two exceptions:

• NoSuchElementException – If the string is empty or no line is found.
• IllegalStateException – If the scanner is closed.

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Example

The following example demonstrates how java.util.Scanner.nextLine() method collects multiple inputs from the user.

The above program will print the following output

Using Java nextInt() Method

The java.util.Scanner.nextInt() method scans the input provided by the user as an integer. If an integer is found, then the scanner advances past the matched input.

The syntax for nextInt() method is as follows:

Public int nextInt()

This method throws the following three exceptions:

• InputMismatchException – If the next token does not match the integer regular expression or if the next token is out of the range.
• NoSuchElementException – If the input is exhausted.
• IllegalStateException – If the scanner is closed.

Example

The following example demonstrates how java.util.Scanner.nextInt() method collects multiple inputs from the user.

The above program is fed with the following input:

The above program will print the following output:

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Using Java nextDouble() Method

The java.util.Scanner.nextDouble() method scans the input provided by the user as a double. If a float regular expression is found, then the scanner advances past the matched input.

The syntax for nextInt() method is as follows:

public double nextDouble()

This method throws the following three exceptions:

• InputMismatchException – If the next token does not match the float regular expression or if the next token is out of the range.
• NoSuchElementException – If the input is exhausted.
• IllegalStateException – If the scanner is closed.

Example

The example demonstrates how java.util.Scanner.nextDouble() method collects multiple inputs from the user.

The above program will result in the following output:

Not Found: Good Not Found: Morning! Found: 3.0 Not Found: + Found: 3.0 Not Found: = Found: 6.0 Not Found: true

Conclusion

Mastering multiple string input in Java using a scanner is a fundamental skill for Java developers, enhancing the versatility and interactivity of Java applications. This article has demonstrated efficient methods to capture multiple inputs using the Scanner class, including the use of nextLine(), nextInt(), and nextDouble() methods. Each method serves a unique purpose, catering to different data types and ensuring that Java developers can handle user inputs with precision and ease. By integrating these techniques into Java programming, developers can build more dynamic, user-friendly applications. It is imperative for practitioners to understand these methods thoroughly to manage input in Java applications effectively. As we have seen, the Scanner class provides a straightforward and powerful toolset for dealing with multiple string inputs, showcasing the strength and flexibility of Java for handling diverse user input scenarios. 

For example, the codes given in this blog are the purpose and can be modified as per an individual’s needs. If you’re interested to learn more about Java & full-stack software development, check out upGrad & IIIT-B’s Executive PG Program in Full-stack Software Development which is designed for working professionals and offers 500+ hours of rigorous training, 9+ projects, and assignments, IIIT-B Alumni status, practical hands-on capstone projects & job assistance with top firms.