in java how do i make user input actually apply to making a choice, like choosing 'a' over 'b'?

Question

i am new to programming and horrible at it.

i know how to use Scanner and everything i just don't know how to make user input apply to the program. i can ask them to enter 'A' or 'yes' but how do i take that and direct it to a certain method in java.

basically what would i put in the code after:

System.out.println ("please enter your choice")
a = scan.nextInt();

? · Accepted Answer

Well if you're asking the user to input "yes" or "no", you don't want to use nextInt().  nextInt() would be used if you asked the user something like, "Enter a number: ".  

Anyway, here's what we do for yes/no.  
String a = scan.nextLine();
if (a.toLowerCase().equals("yes")) {
  //do something here for yes
} else if (a.toLowerCase().equals("no")) {
  //do something for no 
} else {
System.out.println("Sorry, you entered invalid input.");
}

The reason we use toLowerCase is so that "yes" "YES" "Yes" "yEs" all match up with "yes" in our if check.  And we compare two strings by using stringOne.equals(stringTwo).  This will return true if they are equal, and false if not.  

If you're asking the user for a number, here is how you would evaluate the input:

int a = sc.nextInt();

if (a == 1) {
//do something 
} else if ....... etc.

uselton · Answer

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in java how do i make user input actually apply to making a choice, like choosing 'a' over 'b'?

2 Answers