The Java String class equals() method compares the two given strings based on the content of the string. If any character is not matched, it returns false. If all characters are matched, it returns ...

System.out.println("Do you want to restart the program? Enter the letter Y to restart:"); System.out.println("Enter the Letter E to Exit"); ...

It returns true if the invoking string and the string passed in the equals function contains the same characters otherwise it returns false. Both strings must be in same case( Case-sensitive).