Java Program to Replace Multiple Characters in a String
In this program, we will be discussing various methods for replacing multiple characters in String. This can be done using the methods listed below:
- Using String.replace() method
- Using replaceAll() method
- Using replaceFirst() method
Method 1: Using String.replace() method
This method returns a new string resulting from replacing all occurrences of old characters in the string with new characters.
public String replace(char oldch, char newch)
- The old character.
- The new character.
Return Value: It returns a string derived from this string by replacing every occurrence of old character with a new character.
After replacing all o with T : WelcTme tT geeksfTrgeeks After replacing all e with D : WDlcomD to gDDksforgDDks
Method 2: Using replaceAll() method
This method replaces each substring of the string that matches the given regular expression with the given replace_str.
public String replaceAll(String regex, String replace_str)
- regex: the regular expression to which this string is to be matched.
- replace_str: the string which would replace found expression.
Return Value: This method returns the resulting String.
Original String : Welcome to geeksforgeeks After replacing regex with replace_str : AKSHIT SAXENA
Method 3: Using replaceFirst() method
This method replaces the first substring of this string that matches the given regular expression with the given replace_str.
public String replaceFirst(String regex, String replace_str)
- regex: The regular expression to which this string is to be matched.
- replace_str: The string which would replace found expression.
Return value: This method returns a resulting string.
Original String : Welcome to geeksforgeeks After replacing 1st occurrence of regex with replace_str : Welcome to Akshitforgeeks
Attention reader! Don’t stop learning now. Get hold of all the important Java Foundation and Collections concepts with the Fundamentals of Java and Java Collections Course at a student-friendly price and become industry ready. To complete your preparation from learning a language to DS Algo and many more, please refer Complete Interview Preparation Course.