How to replace a word in string

Question:

How to replace word in java?

Answer:

Java has built in methods to replace words from text string.

replace() will replace a word in single occurrence.
replaceAll() will replace all words from the string.
replaceFirst() will replace first word from the string

Code:

public class ReplaceWords {
 
   public static void main(String[] args) {
 
      String str="I do not like green eggs or green ham.";
 
      System.out.println(str);
 
      str=str.replaceAll("green", "blue");
 
      System.out.println(str);
  }
}

Output:

$ java ReplaceWords 
I do not like green eggs or green ham.
I do not like blue eggs or blue ham.