4.18 Password requirements
Websites commonly require a password that satisfies several requirements. Write a program that checks if an input string satisfies the following (error message is shown for each):
Output OK, or all related error messages (in above order). If the input string is "Hello", the output is:
Hints:
Declare a boolean variable for each requirement.
Use a for loop to visit each character, setting the corresponding boolean to true if satisfied (length is done differently though).
Use the functions Character.isLetter() and Character.isDigit() to detect if a character is a letter or a number.
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