Java; String replace (school project)?

To replace a substring in a string in Java, you can use the replace() method of the String class. The replace() method replaces all occurrences of a given substring with a specified replacement string.

Here is an example of how you can use the replace() method to replace a substring in a string:

String str = "Hello, World!";
str = str.replace("World", "Java");  // str is now "Hello, Java!"

You can also use the replaceAll() method of the String class to replace a substring in a string using a regular expression. The replaceAll() method replaces all occurrences of the given regular expression with the specified replacement string.

Here is an example of how you can use the replaceAll() method to replace a substring in a string using a regular expression:

String str = "Hello, World!";
str = str.replaceAll("Worl\\w", "Java");  // str is now "Hello, Java!"

Keep in mind that the replace() and replaceAll() methods do not modify the original string, but rather return a new string with the replacement applied. If you want to modify the original string, you need to assign the result of the replace() or replaceAll() method back to the original string.

I hope this helps! Let me know if you have any other questions.