To correct the error gotten from the bug when the program is executed and you get "the value of input is undefined", you have to rename the function parameter.
Scanner input= new Scanner(System.in);
while(choice < 1 || choice > 9) {
System.out.println("Select an option from the menu below: "
+ "\n1. Letters only"
+ "\n2. Numbers only"
+ "\n3. Binary data"
+ "\n4. Hexadecimal data"
+ "\n5. Binary data which represents an even number"
+ "\n6. A binary string which contains one of 2 patterns"
+ "\n7. Validate a binary stirng which contains both of the patterns"
+ "\n8. Determine if a word is a pattern"
+ "\n9. Exit");
if(choice < 1 || choice > 9) {
System.out.println("Invalid input -- try again\n");
}
}
return choice;
}
The error from your code is based on the fact that The scanner variable in the class is shadowed by the String parameter called input.
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