How to check whether given String contains one or more words in Java?

Problem Description :

Write a program in Java that checks whether given String contains one or more words.

String contains one or more words?

Concept :

If any String is separated by one or more spaces it means that String contains more than one word.We are using a Regular Expression to solve this problem.

Java Program :

	package com.javamultiplex.string;
	import java.util.Scanner;
	/**
	*
	* @author Rohit Agarwal
	* @category Date and Time
	* @problem Check whether string contains one or more words.
	*
	*/
	public class IsStringContainsOnlyOneWord {
	public static void main(String[] args) {
	Scanner input = null;
	try {
	input = new Scanner(System.in);
	System.out.println("Enter String : ");
	String string = input.nextLine();
	string = string.trim();
	/*
	* Regular expression that matches a string contains only
	* non-whitespace characters.
	*/
	String pattern = "^[\\S]+$";
	if (string.matches(pattern)) {
	System.out.println("String contains only one word.");
	} else {
	System.out.println("String contains more than one word.");
	}
	} finally {
	if (input != null) {
	input.close();
	}
	}
	}
	}

view raw IsStringContainsOnlyOneWord.java hosted with ❤ by GitHub

Output :

Case 1 :

Output - Given String contains more than one word.

Case 2 :

Output - Given String contains only one word.

References :

https://en.wikipedia.org/wiki/Regular_expression

https://docs.oracle.com/javase/7/docs/api/java/lang/String.html

https://docs.oracle.com/javase/7/docs/api/java/lang/String.html#matches(java.lang.String)

https://docs.oracle.com/javase/7/docs/api/java/lang/String.html#trim()

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Tags : Date and Time problems, Number of words in String, Solution in Java, Regular expressions, if else statement.

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