Replacing Characters in a String: replace() method creates a new string with the replaced characters. : String Replace « Data Type « Java Tutorial

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2. Data Type
3. String Replace

public class Main {
  public static void main(String[] argv) throws Exception {
    String string = "this is a string";
    // Replace all occurrences of 'a' with 'o'
    String newString = string.replace('a', 'o');
    System.out.println(newString);
  }
}