Hello, Developer of Java. I'll demonstrate how to print each word in a new line in Java in this tutorial.
There are several ways in Java to print every word in a string on a separate line. The string must first be separated based on spaces to display each word in the final array. The following provides step-by-step instructions along with various approach examples:
1. Using String.split() Method
The String.split() method is used to split a string into an array of substrings based on a specified delimiter, in this case, a space character.
Step-by-Step Guide:
- Split the string using the split method: This method returns an array of substrings.
- Iterate through the array: Use a loop to print each array element on a new line.
public class PrintWords
{
public static void main(String[] args)
{
// Sample string
String sentence = "Hello world this is Java";
// Split the string based on space
String[] words = sentence.split(" ");
// Iterate through the array and print each word on a new line
for (String word : words) {
System.out.println(word);
}
}
}Output:
Hello
world
this
is
JavaExplanation:
sentence.split(" ") splits the sentence string into an array of words based on spaces.
The for loop iterates through each word in the array and prints it on a new line.
2. Using Scanner Class
The Scanner class can read input and process it token by token. It is an alternative way to split the string and print each word on a new line.
Step-by-Step Guide:
- Create a Scanner object: Initialize it with the input string.
- Use Scanner to tokenize the string: Use hasNext() and next() methods to process each word.
Example:
import java.util.Scanner;
public class PrintWords
{
public static void main(String[] args)
{
// Sample string
String sentence = "Hello world this is Java";
// Create a Scanner object
Scanner scanner = new Scanner(sentence);
// Loop to print each word on a new line
while (scanner.hasNext()) {
System.out.println(scanner.next());
}
// Close the scanner
scanner.close();
}
}Output:
Hello
world
this
is
JavaExplanation:
Scanner scanner = new Scanner(sentence) creates a Scanner object with the input string.
while (scanner.hasNext()) checks if there are more tokens (words) to read.
System.out.println(scanner.next()) prints the next token (word) on a new line.
3. Using StringTokenizer Class
The StringTokenizer class provides a way to break a string into tokens. It can be used similarly to Scanner.
Step-by-Step Guide:
- Create a StringTokenizer object: Initialize it with the input string and delimiter.
- Use StringTokenizer to iterate through tokens: Use hasMoreTokens() and nextToken() methods to process each word.
Example:
import java.util.StringTokenizer;
public class PrintWords
{
public static void main(String[] args)
{
// Sample string
String sentence = "Hello world this is Java";
// Create a StringTokenizer object
StringTokenizer tokenizer = new StringTokenizer(sentence, " ");
// Loop to print each word on a new line
while (tokenizer.hasMoreTokens()) {
System.out.println(tokenizer.nextToken());
}
}
}Output:
Hello
world
this
is
JavaExplanation:
StringTokenizer tokenizer = new StringTokenizer(sentence, " ") creates a StringTokenizer object with the input string and space as the delimiter.
while (tokenizer.hasMoreTokens()) checks if there are more tokens (words) to read.
System.out.println(tokenizer.nextToken()) prints the next token (word) on a new line.
Conclusion:
Printing each word of a string on a new line in Java can be accomplished using various methods such as String.split(), Scanner, and StringTokenizer. Each method has its advantages and can be chosen based on the specific requirements of your application.
String.split(): Simple and straightforward for basic word splitting.
Scanner: Useful when reading input from different sources.
StringTokenizer: A legacy class, still useful for simple tokenization tasks.
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