replace a word in a string in java

  String newString = originalString.replace("meowing", "purring");
  System.out.println(newString);```
  
This code replaces the word "meowing" in the String "The cat is meowing loudly." with the word "purring". 
The original String is stored as a variable called originalString. The String.replace() method takes two parameters - the word you want to replace and what you are replacing it with. In this example, we are replacing "meowing" with "purring". Then the new string with the replaced word is saved as a newString variable. Lastly, the newString is printed with the System.out.println() method.