![]() ![]() Again it's simple just pass the target and replacement to the replaceAll() method, it is very similar to how you use the replace(CharSequence target, CharSequence replacement) method as demonstrated here. In the second example of the replaceAll() method, I have shown you how to replace all occurrences of a substring in Java. println( "replaced string: " + alternative) // print claan coda println( "orginal string: " + bestseller) // print clean code System. ![]() 'a' is a char variable but "a" is a String variable. You should also remember, single quotes are used for character literals in Java and double quotes are used for String literals in Java e.g. As a workaround, you need to pass a single character String e.g. Remember, even though replaceAll() allows you to replace a single character, you cannot pass a char value to this method as it expects String. This is also one of the common String coding questions but there you need to solve the problem without using the replaceAll() method. In the first example of replaceAll(), I have shown you how to replace all occurrences of a single character in String. Here is a sample Java program that will demonstrate how to use the replaceAll method in Java for replacing a single character, a substring, and using a regular expression for sophisticated find and replace, much like how you do in VI editor in Linux. In this tutorial, I'll show you three examples of using the replaceAll() method in Java for replacing characters, substring, and using the regular expression for advanced find and replace tasks. trim(), split(), join() or concat() methods. This concept is not just relevant for the replaceAll() method but other methods of class which does String manipulation e.g. Many developers forget to store the result of replaceAll() method back and think that the original String is modified, which is wrong and creates some of the most common but hard to find bugs in Java. If you want to use that String you must store it back on the relevant variable. Since String is immutable in Java it cannot be changed, hence this method returns a new modified String. It internally uses classes like Pattern and Matcher from package for searching and replacing matching characters or substring. ![]() The replaceAll() method replaces each substring of this string (the String on which it is called) that matches the given regular expression with the given replacement. Even though Java provides separate methods for replacing characters and replacing substring, you can do all that just by using this single method. The replaceAll() function is a very useful, versatile, and powerful method and as a Java developer, you must know about it. This method also allows you to specify the target substring using the regular expression, which means you can use this to remove all white space from String. You can replace all occurrence of a single character, or a substring of a given String in Java using the replaceAll() method of class. ![]()
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