Generating a Java String of N Repeated Characters

Generating a Java String of N Repeated Characters Made Easy

Creating a Java string of n repeated characters can be complicated, but with the right approach, it doesn't have to be. In this article, we'll cover the most efficient and straightforward way to generate a string of n repeated characters in Java.

Using Java's StringBuilder Class

The most efficient and straightforward way to generate a string of n repeated characters in Java is to use the StringBuilder class. This powerful tool assists with appending strings to an existing string in a very simple manner. To use this class, follow these steps:

1. Declare a new StringBuilder object.
2. Call its append() method, passing in your desired character as an argument.
3. Set the capacity of the StringBuilder to your desired length.
4. Repeat steps 2 and 3 until you have the desired length.
5. Call toString() on your StringBuilder object.

An Example of Generating a Java String of N Repeated Characters

To understand how to use the StringBuilder class for creating a Java string of n repeated characters, let's look at a quick example. Suppose we want to create a string of 10 'Hi' characters. We could do this with the following code sample:

    StringBuilder sb = new StringBuilder();
    for (int i = 0; i < 10; i++) {
        sb.append("Hi");
    }
    sb.setLength(10);
    String result = sb.toString();

Now we have a String variable named result that stores our desired "HiHiHiHiHiHiHiHiHiHi" string.

Conclusion

As we can see, generating a Java string of n repeated characters is relatively easy if we use the StringBuilder class. Of course, there are other ways to accomplish this task, such as using loops or the String.repeat() method introduced in Java 11. However, the StringBuilder solution is the most efficient approach, making it the preferred choice for most developers.