Java string concat() Method

Posted in Java Tutorial

Updated on Oct 30, 2024

By Mari Selvan

👁️ 90 - Views

⏳ 4 mins

💬 1 Comment

Photo Credit to CodeToFun

🙋 Introduction

In Java programming, the String class provides various methods for manipulating strings.

The concat() method is one such method that is used to concatenate one string to the end of another.

In this tutorial, we'll explore the usage and functionality of the concat() method in Java.

💡 Syntax

The signature of the concat() method is as follows:

Syntax

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public String concat(String str);

str: The string to be concatenated to the end of the original string.

📄 Example

Let's delve into an example to illustrate how the concat() method works.

StringConcatenation.java

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public class StringConcatenation {
  public static void main(String[] args) {
    // Original string
    String originalString = "Hello, ";

    // String to be concatenated
    String appendString = "World!";

    // Concatenate strings
    String resultString = originalString.concat(appendString);

    // Output the result
    System.out.println("Concatenated String: " + resultString);
  }
}

💻 Output

Output

Concatenated String: Hello, World!

🧠 How the Program Works

In this example, the concat() method is used to concatenate the strings "Hello, " and "World!".

↩️ Return Value

The concat() method returns a new string that represents the concatenation of the original string and the specified string (str).

📚 Common Use Cases

The concat() method is useful when you need to combine two strings into a single string. It provides a concise and readable way to perform string concatenation.

📝 Notes

While the concat() method is straightforward, Java also provides the + operator for string concatenation, which is a more commonly used approach.
Strings in Java are immutable, and the concat() method creates a new string rather than modifying the original string.

🎢 Optimization

The concat() method is efficient for concatenating strings. However, for repeated concatenation within loops or performance-critical scenarios, consider using StringBuilder or StringBuffer classes for better performance.

🎉 Conclusion

The concat() method in Java is a convenient way to concatenate strings. It provides a clear and concise syntax for combining two strings into a single string.

Feel free to experiment with different strings and explore the behavior of the concat() method in various scenarios. Happy coding!