With this example we are going to demonstrate how to use the replace method of String class. The String class represents character strings. All string literals in Java programs, such as "abc", are implemented as instances of this class. In short, to replace a String you should:
- Create a new String.
- Use
replace(char oldChar, char newChar)API method. This method returns a new string resulting from replacing all occurrences ofoldCharin this string withnewChar. - Use
replaceFirst(String regex, String replacement)API method. It replaces the first substring of this string that matches the given regular expression with the given replacement. - Use
replaceAll(String regex, String replacement)API method. It replaces each substring of this string that matches the given regular expression with the given replacement.
Let’s take a look at the code snippet that follows:
package com.javacodegeeks.snippets.core;
public class StringReplaceMethod {
public static void main(String[] args) {
String s = "Java Code Geeks - Java Examples";
// replace all occurrences of given character with new one
System.out.println(s.replace('e','i'));
// replace only first occurrence of given string
System.out.println(s.replaceFirst("Ja", "Je"));
// replace all occurrence of given string
System.out.println(s.replaceAll("Ja", "Je") );
}
}
Output:
Java Codi Giiks - Java Examplis
Jeva Code Geeks - Java Examples
Jeva Code Geeks - Jeva Examples
This was an example of how to use the replace method of String class in Java.
