1. Introduction
The StringJoiner class in Java is used to construct a sequence of characters separated by a delimiter and optionally starting with a supplied prefix and ending with a supplied suffix. This is particularly useful in applications where you need to build a string from multiple parts, such as in SQL query construction or generating a formatted message.
Key Points
- StringJoiner is part of java.util package.
- It allows adding strings with a specified delimiter.
- Prefix and suffix can be added to the entire sequence.
- It simplifies the joining of multiple string elements in a readable manner.
2. Program Steps
1. Create an instance of StringJoiner with a delimiter.
2. Optionally specify a prefix and a suffix.
3. Add strings to the StringJoiner.
4. Convert the StringJoiner to a string for output.
3. Code Program
import java.util.StringJoiner; public class StringJoinerExample { public static void main(String[] args) { // Create a StringJoiner with a comma as delimiter, and square brackets as prefix and suffix StringJoiner joiner = new StringJoiner(", ", "[", "]"); // Add elements joiner.add("Apple"); joiner.add("Banana"); joiner.add("Cherry"); joiner.add("Date"); // Convert to String String result = joiner.toString(); // Print the result System.out.println(result); } }
Output:
[Apple, Banana, Cherry, Date]
Explanation:
1. StringJoiner joiner = new StringJoiner(", ", "[", "]"): Initializes a StringJoiner with a comma and space as the delimiter and square brackets as the prefix and suffix.
2. joiner.add("Apple"); joiner.add("Banana"); joiner.add("Cherry"); joiner.add("Date");: Adds four strings to the StringJoiner.
3. String result = joiner.toString(): Converts the StringJoiner content to a String.
4. System.out.println(result): Outputs the string representation of the StringJoiner, showing the strings joined by commas and enclosed in square brackets.
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