How do I concatenate strings in Java?

How do I concatenate strings in Java?

In Java, you can concatenate strings using the '+' operator or the String.concat() method. For example: String result = str1 + str2;.

Are there any performance differences between using '+' and String.concat()?

Yes, using '+' in a loop can lead to performance issues due to the creation of multiple String objects. It's better to use StringBuilder for concatenation in such cases.

What is StringBuilder and how does it work?

StringBuilder is a mutable sequence of characters. It allows you to append, insert, or delete characters without creating new String objects, making it more efficient for multiple concatenations.

Can you show me an example of using StringBuilder?

Sure! Here's an example: StringBuilder sb = new StringBuilder(); sb.append("Hello"); sb.append(" "); sb.append("World!"); String result = sb.toString(); // result is "Hello World!"